Merge branch 'master' into error-handler-test

13 files changed, 893 insertions, 784 deletions

diff --git a/tests/_autospec.py b/tests/_autospec.py
new file mode 100644
index 000000000..ee2fc1973
--- /dev/null
+++ b/tests/_autospec.py
@@ -0,0 +1,64 @@
+import contextlib
+import functools
+import unittest.mock
+from typing import Callable
+
+
[email protected](unittest.mock._patch.decoration_helper)
[email protected]
+def _decoration_helper(self, patched, args, keywargs):
+    """Skips adding patchings as args if their `dont_pass` attribute is True."""
+    # Don't ask what this does. It's just a copy from stdlib, but with the dont_pass check added.
+    extra_args = []
+    with contextlib.ExitStack() as exit_stack:
+        for patching in patched.patchings:
+            arg = exit_stack.enter_context(patching)
+            if not getattr(patching, "dont_pass", False):
+                # Only add the patching as an arg if dont_pass is False.
+                if patching.attribute_name is not None:
+                    keywargs.update(arg)
+                elif patching.new is unittest.mock.DEFAULT:
+                    extra_args.append(arg)
+
+        args += tuple(extra_args)
+        yield args, keywargs
+
+
[email protected](unittest.mock._patch.copy)
+def _copy(self):
+    """Copy the `dont_pass` attribute along with the standard copy operation."""
+    patcher_copy = _copy.original(self)
+    patcher_copy.dont_pass = getattr(self, "dont_pass", False)
+    return patcher_copy
+
+
+# Monkey-patch the patcher class :)
+_copy.original = unittest.mock._patch.copy
+unittest.mock._patch.copy = _copy
+unittest.mock._patch.decoration_helper = _decoration_helper
+
+
+def autospec(target, *attributes: str, pass_mocks: bool = True, **patch_kwargs) -> Callable:
+    """
+    Patch multiple `attributes` of a `target` with autospecced mocks and `spec_set` as True.
+
+    If `pass_mocks` is True, pass the autospecced mocks as arguments to the decorated object.
+    """
+    # Caller's kwargs should take priority and overwrite the defaults.
+    kwargs = dict(spec_set=True, autospec=True)
+    kwargs.update(patch_kwargs)
+
+    # Import the target if it's a string.
+    # This is to support both object and string targets like patch.multiple.
+    if type(target) is str:
+        target = unittest.mock._importer(target)
+
+    def decorator(func):
+        for attribute in attributes:
+            patcher = unittest.mock.patch.object(target, attribute, **kwargs)
+            if not pass_mocks:
+                # A custom attribute to keep track of which patchings should be skipped.
+                patcher.dont_pass = True
+            func = patcher(func)
+        return func
+    return decorator
diff --git a/tests/bot/exts/backend/sync/test_base.py b/tests/bot/exts/backend/sync/test_base.py
index 886c243cf..3ad9db9c3 100644
--- a/tests/bot/exts/backend/sync/test_base.py
+++ b/tests/bot/exts/backend/sync/test_base.py
@@ -1,12 +1,9 @@
-import asyncio
 import unittest
 from unittest import mock
 
-import discord
 
-from bot import constants
 from bot.api import ResponseCodeError
-from bot.exts.backend.sync._syncers import Syncer, _Diff
+from bot.exts.backend.sync._syncers import Syncer
 from tests import helpers
 
 
@@ -18,292 +15,21 @@ class TestSyncer(Syncer):
     _sync = mock.AsyncMock()
 
 
-class SyncerBaseTests(unittest.TestCase):
-    """Tests for the syncer base class."""
-
-    def setUp(self):
-        self.bot = helpers.MockBot()
-
-    def test_instantiation_fails_without_abstract_methods(self):
-        """The class must have abstract methods implemented."""
-        with self.assertRaisesRegex(TypeError, "Can't instantiate abstract class"):
-            Syncer(self.bot)
-
-
-class SyncerSendPromptTests(unittest.IsolatedAsyncioTestCase):
-    """Tests for sending the sync confirmation prompt."""
-
-    def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = TestSyncer(self.bot)
-
-    def mock_get_channel(self):
-        """Fixture to return a mock channel and message for when `get_channel` is used."""
-        self.bot.reset_mock()
-
-        mock_channel = helpers.MockTextChannel()
-        mock_message = helpers.MockMessage()
-
-        mock_channel.send.return_value = mock_message
-        self.bot.get_channel.return_value = mock_channel
-
-        return mock_channel, mock_message
-
-    def mock_fetch_channel(self):
-        """Fixture to return a mock channel and message for when `fetch_channel` is used."""
-        self.bot.reset_mock()
-
-        mock_channel = helpers.MockTextChannel()
-        mock_message = helpers.MockMessage()
-
-        self.bot.get_channel.return_value = None
-        mock_channel.send.return_value = mock_message
-        self.bot.fetch_channel.return_value = mock_channel
-
-        return mock_channel, mock_message
-
-    async def test_send_prompt_edits_and_returns_message(self):
-        """The given message should be edited to display the prompt and then should be returned."""
-        msg = helpers.MockMessage()
-        ret_val = await self.syncer._send_prompt(msg)
-
-        msg.edit.assert_called_once()
-        self.assertIn("content", msg.edit.call_args[1])
-        self.assertEqual(ret_val, msg)
-
-    async def test_send_prompt_gets_dev_core_channel(self):
-        """The dev-core channel should be retrieved if an extant message isn't given."""
-        subtests = (
-            (self.bot.get_channel, self.mock_get_channel),
-            (self.bot.fetch_channel, self.mock_fetch_channel),
-        )
-
-        for method, mock_ in subtests:
-            with self.subTest(method=method, msg=mock_.__name__):
-                mock_()
-                await self.syncer._send_prompt()
-
-                method.assert_called_once_with(constants.Channels.dev_core)
-
-    async def test_send_prompt_returns_none_if_channel_fetch_fails(self):
-        """None should be returned if there's an HTTPException when fetching the channel."""
-        self.bot.get_channel.return_value = None
-        self.bot.fetch_channel.side_effect = discord.HTTPException(mock.MagicMock(), "test error!")
-
-        ret_val = await self.syncer._send_prompt()
-
-        self.assertIsNone(ret_val)
-
-    async def test_send_prompt_sends_and_returns_new_message_if_not_given(self):
-        """A new message mentioning core devs should be sent and returned if message isn't given."""
-        for mock_ in (self.mock_get_channel, self.mock_fetch_channel):
-            with self.subTest(msg=mock_.__name__):
-                mock_channel, mock_message = mock_()
-                ret_val = await self.syncer._send_prompt()
-
-                mock_channel.send.assert_called_once()
-                self.assertIn(self.syncer._CORE_DEV_MENTION, mock_channel.send.call_args[0][0])
-                self.assertEqual(ret_val, mock_message)
-
-    async def test_send_prompt_adds_reactions(self):
-        """The message should have reactions for confirmation added."""
-        extant_message = helpers.MockMessage()
-        subtests = (
-            (extant_message, lambda: (None, extant_message)),
-            (None, self.mock_get_channel),
-            (None, self.mock_fetch_channel),
-        )
-
-        for message_arg, mock_ in subtests:
-            subtest_msg = "Extant message" if mock_.__name__ == "<lambda>" else mock_.__name__
-
-            with self.subTest(msg=subtest_msg):
-                _, mock_message = mock_()
-                await self.syncer._send_prompt(message_arg)
-
-                calls = [mock.call(emoji) for emoji in self.syncer._REACTION_EMOJIS]
-                mock_message.add_reaction.assert_has_calls(calls)
-
-
-class SyncerConfirmationTests(unittest.IsolatedAsyncioTestCase):
-    """Tests for waiting for a sync confirmation reaction on the prompt."""
-
-    def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = TestSyncer(self.bot)
-        self.core_dev_role = helpers.MockRole(id=constants.Roles.core_developers)
-
-    @staticmethod
-    def get_message_reaction(emoji):
-        """Fixture to return a mock message an reaction from the given `emoji`."""
-        message = helpers.MockMessage()
-        reaction = helpers.MockReaction(emoji=emoji, message=message)
-
-        return message, reaction
-
-    def test_reaction_check_for_valid_emoji_and_authors(self):
-        """Should return True if authors are identical or are a bot and a core dev, respectively."""
-        user_subtests = (
-            (
-                helpers.MockMember(id=77),
-                helpers.MockMember(id=77),
-                "identical users",
-            ),
-            (
-                helpers.MockMember(id=77, bot=True),
-                helpers.MockMember(id=43, roles=[self.core_dev_role]),
-                "bot author and core-dev reactor",
-            ),
-        )
-
-        for emoji in self.syncer._REACTION_EMOJIS:
-            for author, user, msg in user_subtests:
-                with self.subTest(author=author, user=user, emoji=emoji, msg=msg):
-                    message, reaction = self.get_message_reaction(emoji)
-                    ret_val = self.syncer._reaction_check(author, message, reaction, user)
-
-                    self.assertTrue(ret_val)
-
-    def test_reaction_check_for_invalid_reactions(self):
-        """Should return False for invalid reaction events."""
-        valid_emoji = self.syncer._REACTION_EMOJIS[0]
-        subtests = (
-            (
-                helpers.MockMember(id=77),
-                *self.get_message_reaction(valid_emoji),
-                helpers.MockMember(id=43, roles=[self.core_dev_role]),
-                "users are not identical",
-            ),
-            (
-                helpers.MockMember(id=77, bot=True),
-                *self.get_message_reaction(valid_emoji),
-                helpers.MockMember(id=43),
-                "reactor lacks the core-dev role",
-            ),
-            (
-                helpers.MockMember(id=77, bot=True, roles=[self.core_dev_role]),
-                *self.get_message_reaction(valid_emoji),
-                helpers.MockMember(id=77, bot=True, roles=[self.core_dev_role]),
-                "reactor is a bot",
-            ),
-            (
-                helpers.MockMember(id=77),
-                helpers.MockMessage(id=95),
-                helpers.MockReaction(emoji=valid_emoji, message=helpers.MockMessage(id=26)),
-                helpers.MockMember(id=77),
-                "messages are not identical",
-            ),
-            (
-                helpers.MockMember(id=77),
-                *self.get_message_reaction("InVaLiD"),
-                helpers.MockMember(id=77),
-                "emoji is invalid",
-            ),
-        )
-
-        for *args, msg in subtests:
-            kwargs = dict(zip(("author", "message", "reaction", "user"), args))
-            with self.subTest(**kwargs, msg=msg):
-                ret_val = self.syncer._reaction_check(*args)
-                self.assertFalse(ret_val)
-
-    async def test_wait_for_confirmation(self):
-        """The message should always be edited and only return True if the emoji is a check mark."""
-        subtests = (
-            (constants.Emojis.check_mark, True, None),
-            ("InVaLiD", False, None),
-            (None, False, asyncio.TimeoutError),
-        )
-
-        for emoji, ret_val, side_effect in subtests:
-            for bot in (True, False):
-                with self.subTest(emoji=emoji, ret_val=ret_val, side_effect=side_effect, bot=bot):
-                    # Set up mocks
-                    message = helpers.MockMessage()
-                    member = helpers.MockMember(bot=bot)
-
-                    self.bot.wait_for.reset_mock()
-                    self.bot.wait_for.return_value = (helpers.MockReaction(emoji=emoji), None)
-                    self.bot.wait_for.side_effect = side_effect
-
-                    # Call the function
-                    actual_return = await self.syncer._wait_for_confirmation(member, message)
-
-                    # Perform assertions
-                    self.bot.wait_for.assert_called_once()
-                    self.assertIn("reaction_add", self.bot.wait_for.call_args[0])
-
-                    message.edit.assert_called_once()
-                    kwargs = message.edit.call_args[1]
-                    self.assertIn("content", kwargs)
-
-                    # Core devs should only be mentioned if the author is a bot.
-                    if bot:
-                        self.assertIn(self.syncer._CORE_DEV_MENTION, kwargs["content"])
-                    else:
-                        self.assertNotIn(self.syncer._CORE_DEV_MENTION, kwargs["content"])
-
-                    self.assertIs(actual_return, ret_val)
-
-
 class SyncerSyncTests(unittest.IsolatedAsyncioTestCase):
     """Tests for main function orchestrating the sync."""
 
     def setUp(self):
-        self.bot = helpers.MockBot(user=helpers.MockMember(bot=True))
-        self.syncer = TestSyncer(self.bot)
-
-    async def test_sync_respects_confirmation_result(self):
-        """The sync should abort if confirmation fails and continue if confirmed."""
-        mock_message = helpers.MockMessage()
-        subtests = (
-            (True, mock_message),
-            (False, None),
-        )
-
-        for confirmed, message in subtests:
-            with self.subTest(confirmed=confirmed):
-                self.syncer._sync.reset_mock()
-                self.syncer._get_diff.reset_mock()
-
-                diff = _Diff({1, 2, 3}, {4, 5}, None)
-                self.syncer._get_diff.return_value = diff
-                self.syncer._get_confirmation_result = mock.AsyncMock(
-                    return_value=(confirmed, message)
-                )
-
-                guild = helpers.MockGuild()
-                await self.syncer.sync(guild)
+        patcher = mock.patch("bot.instance", new=helpers.MockBot(user=helpers.MockMember(bot=True)))
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
-                self.syncer._get_diff.assert_called_once_with(guild)
-                self.syncer._get_confirmation_result.assert_called_once()
+        self.guild = helpers.MockGuild()
 
-                if confirmed:
-                    self.syncer._sync.assert_called_once_with(diff)
-                else:
-                    self.syncer._sync.assert_not_called()
+        TestSyncer._get_diff.reset_mock(return_value=True, side_effect=True)
+        TestSyncer._sync.reset_mock(return_value=True, side_effect=True)
 
-    async def test_sync_diff_size(self):
-        """The diff size should be correctly calculated."""
-        subtests = (
-            (6, _Diff({1, 2}, {3, 4}, {5, 6})),
-            (5, _Diff({1, 2, 3}, None, {4, 5})),
-            (0, _Diff(None, None, None)),
-            (0, _Diff(set(), set(), set())),
-        )
-
-        for size, diff in subtests:
-            with self.subTest(size=size, diff=diff):
-                self.syncer._get_diff.reset_mock()
-                self.syncer._get_diff.return_value = diff
-                self.syncer._get_confirmation_result = mock.AsyncMock(return_value=(False, None))
-
-                guild = helpers.MockGuild()
-                await self.syncer.sync(guild)
-
-                self.syncer._get_diff.assert_called_once_with(guild)
-                self.syncer._get_confirmation_result.assert_called_once()
-                self.assertEqual(self.syncer._get_confirmation_result.call_args[0][0], size)
+        # Make sure `_get_diff` returns a MagicMock, not an AsyncMock
+        TestSyncer._get_diff.return_value = mock.MagicMock()
 
     async def test_sync_message_edited(self):
         """The message should be edited if one was sent, even if the sync has an API error."""
@@ -315,90 +41,26 @@ class SyncerSyncTests(unittest.IsolatedAsyncioTestCase):
 
         for message, side_effect, should_edit in subtests:
             with self.subTest(message=message, side_effect=side_effect, should_edit=should_edit):
-                self.syncer._sync.side_effect = side_effect
-                self.syncer._get_confirmation_result = mock.AsyncMock(
-                    return_value=(True, message)
-                )
+                TestSyncer._sync.side_effect = side_effect
+                ctx = helpers.MockContext()
+                ctx.send.return_value = message
 
-                guild = helpers.MockGuild()
-                await self.syncer.sync(guild)
+                await TestSyncer.sync(self.guild, ctx)
 
                 if should_edit:
                     message.edit.assert_called_once()
                     self.assertIn("content", message.edit.call_args[1])
 
-    async def test_sync_confirmation_context_redirect(self):
-        """If ctx is given, a new message should be sent and author should be ctx's author."""
-        mock_member = helpers.MockMember()
+    async def test_sync_message_sent(self):
+        """If ctx is given, a new message should be sent."""
         subtests = (
-            (None, self.bot.user, None),
-            (helpers.MockContext(author=mock_member), mock_member, helpers.MockMessage()),
+            (None, None),
+            (helpers.MockContext(), helpers.MockMessage()),
         )
 
-        for ctx, author, message in subtests:
-            with self.subTest(ctx=ctx, author=author, message=message):
-                if ctx is not None:
-                    ctx.send.return_value = message
-
-                # Make sure `_get_diff` returns a MagicMock, not an AsyncMock
-                self.syncer._get_diff.return_value = mock.MagicMock()
-
-                self.syncer._get_confirmation_result = mock.AsyncMock(return_value=(False, None))
-
-                guild = helpers.MockGuild()
-                await self.syncer.sync(guild, ctx)
+        for ctx, message in subtests:
+            with self.subTest(ctx=ctx, message=message):
+                await TestSyncer.sync(self.guild, ctx)
 
                 if ctx is not None:
                     ctx.send.assert_called_once()
-
-                self.syncer._get_confirmation_result.assert_called_once()
-                self.assertEqual(self.syncer._get_confirmation_result.call_args[0][1], author)
-                self.assertEqual(self.syncer._get_confirmation_result.call_args[0][2], message)
-
-    @mock.patch.object(constants.Sync, "max_diff", new=3)
-    async def test_confirmation_result_small_diff(self):
-        """Should always return True and the given message if the diff size is too small."""
-        author = helpers.MockMember()
-        expected_message = helpers.MockMessage()
-
-        for size in (3, 2):  # pragma: no cover
-            with self.subTest(size=size):
-                self.syncer._send_prompt = mock.AsyncMock()
-                self.syncer._wait_for_confirmation = mock.AsyncMock()
-
-                coro = self.syncer._get_confirmation_result(size, author, expected_message)
-                result, actual_message = await coro
-
-                self.assertTrue(result)
-                self.assertEqual(actual_message, expected_message)
-                self.syncer._send_prompt.assert_not_called()
-                self.syncer._wait_for_confirmation.assert_not_called()
-
-    @mock.patch.object(constants.Sync, "max_diff", new=3)
-    async def test_confirmation_result_large_diff(self):
-        """Should return True if confirmed and False if _send_prompt fails or aborted."""
-        author = helpers.MockMember()
-        mock_message = helpers.MockMessage()
-
-        subtests = (
-            (True, mock_message, True, "confirmed"),
-            (False, None, False, "_send_prompt failed"),
-            (False, mock_message, False, "aborted"),
-        )
-
-        for expected_result, expected_message, confirmed, msg in subtests:  # pragma: no cover
-            with self.subTest(msg=msg):
-                self.syncer._send_prompt = mock.AsyncMock(return_value=expected_message)
-                self.syncer._wait_for_confirmation = mock.AsyncMock(return_value=confirmed)
-
-                coro = self.syncer._get_confirmation_result(4, author)
-                actual_result, actual_message = await coro
-
-                self.syncer._send_prompt.assert_called_once_with(None)  # message defaults to None
-                self.assertIs(actual_result, expected_result)
-                self.assertEqual(actual_message, expected_message)
-
-                if expected_message:
-                    self.syncer._wait_for_confirmation.assert_called_once_with(
-                        author, expected_message
-                    )
diff --git a/tests/bot/exts/backend/sync/test_cog.py b/tests/bot/exts/backend/sync/test_cog.py
index 1b89564f2..22a07313e 100644
--- a/tests/bot/exts/backend/sync/test_cog.py
+++ b/tests/bot/exts/backend/sync/test_cog.py
@@ -29,24 +29,24 @@ class SyncCogTestCase(unittest.IsolatedAsyncioTestCase):
     def setUp(self):
         self.bot = helpers.MockBot()
 
-        self.role_syncer_patcher = mock.patch(
+        role_syncer_patcher = mock.patch(
             "bot.exts.backend.sync._syncers.RoleSyncer",
             autospec=Syncer,
             spec_set=True
         )
-        self.user_syncer_patcher = mock.patch(
+        user_syncer_patcher = mock.patch(
             "bot.exts.backend.sync._syncers.UserSyncer",
             autospec=Syncer,
             spec_set=True
         )
-        self.RoleSyncer = self.role_syncer_patcher.start()
-        self.UserSyncer = self.user_syncer_patcher.start()
 
-        self.cog = Sync(self.bot)
+        self.RoleSyncer = role_syncer_patcher.start()
+        self.UserSyncer = user_syncer_patcher.start()
 
-    def tearDown(self):
-        self.role_syncer_patcher.stop()
-        self.user_syncer_patcher.stop()
+        self.addCleanup(role_syncer_patcher.stop)
+        self.addCleanup(user_syncer_patcher.stop)
+
+        self.cog = Sync(self.bot)
 
     @staticmethod
     def response_error(status: int) -> ResponseCodeError:
@@ -73,8 +73,6 @@ class SyncCogTests(SyncCogTestCase):
 
         Sync(self.bot)
 
-        self.RoleSyncer.assert_called_once_with(self.bot)
-        self.UserSyncer.assert_called_once_with(self.bot)
         sync_guild.assert_called_once_with()
         self.bot.loop.create_task.assert_called_once_with(mock_sync_guild_coro)
 
@@ -83,8 +81,8 @@ class SyncCogTests(SyncCogTestCase):
         for guild in (helpers.MockGuild(), None):
             with self.subTest(guild=guild):
                 self.bot.reset_mock()
-                self.cog.role_syncer.reset_mock()
-                self.cog.user_syncer.reset_mock()
+                self.RoleSyncer.reset_mock()
+                self.UserSyncer.reset_mock()
 
                 self.bot.get_guild = mock.MagicMock(return_value=guild)
 
@@ -94,11 +92,11 @@ class SyncCogTests(SyncCogTestCase):
                 self.bot.get_guild.assert_called_once_with(constants.Guild.id)
 
                 if guild is None:
-                    self.cog.role_syncer.sync.assert_not_called()
-                    self.cog.user_syncer.sync.assert_not_called()
+                    self.RoleSyncer.sync.assert_not_called()
+                    self.UserSyncer.sync.assert_not_called()
                 else:
-                    self.cog.role_syncer.sync.assert_called_once_with(guild)
-                    self.cog.user_syncer.sync.assert_called_once_with(guild)
+                    self.RoleSyncer.sync.assert_called_once_with(guild)
+                    self.UserSyncer.sync.assert_called_once_with(guild)
 
     async def patch_user_helper(self, side_effect: BaseException) -> None:
         """Helper to set a side effect for bot.api_client.patch and then assert it is called."""
@@ -392,16 +390,16 @@ class SyncCogCommandTests(SyncCogTestCase, CommandTestCase):
     async def test_sync_roles_command(self):
         """sync() should be called on the RoleSyncer."""
         ctx = helpers.MockContext()
-        await self.cog.sync_roles_command.callback(self.cog, ctx)
+        await self.cog.sync_roles_command(self.cog, ctx)
 
-        self.cog.role_syncer.sync.assert_called_once_with(ctx.guild, ctx)
+        self.RoleSyncer.sync.assert_called_once_with(ctx.guild, ctx)
 
     async def test_sync_users_command(self):
         """sync() should be called on the UserSyncer."""
         ctx = helpers.MockContext()
-        await self.cog.sync_users_command.callback(self.cog, ctx)
+        await self.cog.sync_users_command(self.cog, ctx)
 
-        self.cog.user_syncer.sync.assert_called_once_with(ctx.guild, ctx)
+        self.UserSyncer.sync.assert_called_once_with(ctx.guild, ctx)
 
     async def test_commands_require_admin(self):
         """The sync commands should only run if the author has the administrator permission."""
diff --git a/tests/bot/exts/backend/sync/test_roles.py b/tests/bot/exts/backend/sync/test_roles.py
index 7b9f40cad..541074336 100644
--- a/tests/bot/exts/backend/sync/test_roles.py
+++ b/tests/bot/exts/backend/sync/test_roles.py
@@ -22,8 +22,9 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
     """Tests for determining differences between roles in the DB and roles in the Guild cache."""
 
     def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = RoleSyncer(self.bot)
+        patcher = mock.patch("bot.instance", new=helpers.MockBot())
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
     @staticmethod
     def get_guild(*roles):
@@ -44,7 +45,7 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         self.bot.api_client.get.return_value = [fake_role()]
         guild = self.get_guild(fake_role())
 
-        actual_diff = await self.syncer._get_diff(guild)
+        actual_diff = await RoleSyncer._get_diff(guild)
         expected_diff = (set(), set(), set())
 
         self.assertEqual(actual_diff, expected_diff)
@@ -56,7 +57,7 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         self.bot.api_client.get.return_value = [fake_role(id=41, name="old"), fake_role()]
         guild = self.get_guild(updated_role, fake_role())
 
-        actual_diff = await self.syncer._get_diff(guild)
+        actual_diff = await RoleSyncer._get_diff(guild)
         expected_diff = (set(), {_Role(**updated_role)}, set())
 
         self.assertEqual(actual_diff, expected_diff)
@@ -68,7 +69,7 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         self.bot.api_client.get.return_value = [fake_role()]
         guild = self.get_guild(fake_role(), new_role)
 
-        actual_diff = await self.syncer._get_diff(guild)
+        actual_diff = await RoleSyncer._get_diff(guild)
         expected_diff = ({_Role(**new_role)}, set(), set())
 
         self.assertEqual(actual_diff, expected_diff)
@@ -80,7 +81,7 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         self.bot.api_client.get.return_value = [fake_role(), deleted_role]
         guild = self.get_guild(fake_role())
 
-        actual_diff = await self.syncer._get_diff(guild)
+        actual_diff = await RoleSyncer._get_diff(guild)
         expected_diff = (set(), set(), {_Role(**deleted_role)})
 
         self.assertEqual(actual_diff, expected_diff)
@@ -98,7 +99,7 @@ class RoleSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         ]
         guild = self.get_guild(fake_role(), new, updated)
 
-        actual_diff = await self.syncer._get_diff(guild)
+        actual_diff = await RoleSyncer._get_diff(guild)
         expected_diff = ({_Role(**new)}, {_Role(**updated)}, {_Role(**deleted)})
 
         self.assertEqual(actual_diff, expected_diff)
@@ -108,8 +109,9 @@ class RoleSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
     """Tests for the API requests that sync roles."""
 
     def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = RoleSyncer(self.bot)
+        patcher = mock.patch("bot.instance", new=helpers.MockBot())
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
     async def test_sync_created_roles(self):
         """Only POST requests should be made with the correct payload."""
@@ -117,7 +119,7 @@ class RoleSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
 
         role_tuples = {_Role(**role) for role in roles}
         diff = _Diff(role_tuples, set(), set())
-        await self.syncer._sync(diff)
+        await RoleSyncer._sync(diff)
 
         calls = [mock.call("bot/roles", json=role) for role in roles]
         self.bot.api_client.post.assert_has_calls(calls, any_order=True)
@@ -132,7 +134,7 @@ class RoleSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
 
         role_tuples = {_Role(**role) for role in roles}
         diff = _Diff(set(), role_tuples, set())
-        await self.syncer._sync(diff)
+        await RoleSyncer._sync(diff)
 
         calls = [mock.call(f"bot/roles/{role['id']}", json=role) for role in roles]
         self.bot.api_client.put.assert_has_calls(calls, any_order=True)
@@ -147,7 +149,7 @@ class RoleSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
 
         role_tuples = {_Role(**role) for role in roles}
         diff = _Diff(set(), set(), role_tuples)
-        await self.syncer._sync(diff)
+        await RoleSyncer._sync(diff)
 
         calls = [mock.call(f"bot/roles/{role['id']}") for role in roles]
         self.bot.api_client.delete.assert_has_calls(calls, any_order=True)
diff --git a/tests/bot/exts/backend/sync/test_users.py b/tests/bot/exts/backend/sync/test_users.py
index c0a1da35c..61673e1bb 100644
--- a/tests/bot/exts/backend/sync/test_users.py
+++ b/tests/bot/exts/backend/sync/test_users.py
@@ -1,7 +1,7 @@
 import unittest
 from unittest import mock
 
-from bot.exts.backend.sync._syncers import UserSyncer, _Diff, _User
+from bot.exts.backend.sync._syncers import UserSyncer, _Diff
 from tests import helpers
 
 
@@ -10,7 +10,7 @@ def fake_user(**kwargs):
     kwargs.setdefault("id", 43)
     kwargs.setdefault("name", "bob the test man")
     kwargs.setdefault("discriminator", 1337)
-    kwargs.setdefault("roles", (666,))
+    kwargs.setdefault("roles", [666])
     kwargs.setdefault("in_guild", True)
 
     return kwargs
@@ -20,8 +20,9 @@ class UserSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
     """Tests for determining differences between users in the DB and users in the Guild cache."""
 
     def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = UserSyncer(self.bot)
+        patcher = mock.patch("bot.instance", new=helpers.MockBot())
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
     @staticmethod
     def get_guild(*members):
@@ -40,22 +41,42 @@ class UserSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
 
         return guild
 
+    @staticmethod
+    def get_mock_member(member: dict):
+        member = member.copy()
+        del member["in_guild"]
+        mock_member = helpers.MockMember(**member)
+        mock_member.roles = [helpers.MockRole(id=role_id) for role_id in member["roles"]]
+        return mock_member
+
     async def test_empty_diff_for_no_users(self):
         """When no users are given, an empty diff should be returned."""
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": []
+        }
         guild = self.get_guild()
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = (set(), set(), None)
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([], [], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
     async def test_empty_diff_for_identical_users(self):
         """No differences should be found if the users in the guild and DB are identical."""
-        self.bot.api_client.get.return_value = [fake_user()]
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user()]
+        }
         guild = self.get_guild(fake_user())
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = (set(), set(), None)
+        guild.get_member.return_value = self.get_mock_member(fake_user())
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([], [], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
@@ -63,59 +84,102 @@ class UserSyncerDiffTests(unittest.IsolatedAsyncioTestCase):
         """Only updated users should be added to the 'updated' set of the diff."""
         updated_user = fake_user(id=99, name="new")
 
-        self.bot.api_client.get.return_value = [fake_user(id=99, name="old"), fake_user()]
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user(id=99, name="old"), fake_user()]
+        }
         guild = self.get_guild(updated_user, fake_user())
+        guild.get_member.side_effect = [
+            self.get_mock_member(updated_user),
+            self.get_mock_member(fake_user())
+        ]
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = (set(), {_User(**updated_user)}, None)
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([], [{"id": 99, "name": "new"}], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
     async def test_diff_for_new_users(self):
-        """Only new users should be added to the 'created' set of the diff."""
+        """Only new users should be added to the 'created' list of the diff."""
         new_user = fake_user(id=99, name="new")
 
-        self.bot.api_client.get.return_value = [fake_user()]
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user()]
+        }
         guild = self.get_guild(fake_user(), new_user)
-
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = ({_User(**new_user)}, set(), None)
+        guild.get_member.side_effect = [
+            self.get_mock_member(fake_user()),
+            self.get_mock_member(new_user)
+        ]
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([new_user], [], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
     async def test_diff_sets_in_guild_false_for_leaving_users(self):
         """When a user leaves the guild, the `in_guild` flag is updated to `False`."""
-        leaving_user = fake_user(id=63, in_guild=False)
-
-        self.bot.api_client.get.return_value = [fake_user(), fake_user(id=63)]
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user(), fake_user(id=63)]
+        }
         guild = self.get_guild(fake_user())
+        guild.get_member.side_effect = [
+            self.get_mock_member(fake_user()),
+            None
+        ]
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = (set(), {_User(**leaving_user)}, None)
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([], [{"id": 63, "in_guild": False}], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
     async def test_diff_for_new_updated_and_leaving_users(self):
         """When users are added, updated, and removed, all of them are returned properly."""
         new_user = fake_user(id=99, name="new")
+
         updated_user = fake_user(id=55, name="updated")
-        leaving_user = fake_user(id=63, in_guild=False)
 
-        self.bot.api_client.get.return_value = [fake_user(), fake_user(id=55), fake_user(id=63)]
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user(), fake_user(id=55), fake_user(id=63)]
+        }
         guild = self.get_guild(fake_user(), new_user, updated_user)
+        guild.get_member.side_effect = [
+            self.get_mock_member(fake_user()),
+            self.get_mock_member(updated_user),
+            None
+        ]
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = ({_User(**new_user)}, {_User(**updated_user), _User(**leaving_user)}, None)
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([new_user], [{"id": 55, "name": "updated"}, {"id": 63, "in_guild": False}], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
     async def test_empty_diff_for_db_users_not_in_guild(self):
-        """When the DB knows a user the guild doesn't, no difference is found."""
-        self.bot.api_client.get.return_value = [fake_user(), fake_user(id=63, in_guild=False)]
+        """When the DB knows a user, but the guild doesn't, no difference is found."""
+        self.bot.api_client.get.return_value = {
+            "count": 3,
+            "next_page_no": None,
+            "previous_page_no": None,
+            "results": [fake_user(), fake_user(id=63, in_guild=False)]
+        }
         guild = self.get_guild(fake_user())
+        guild.get_member.side_effect = [
+            self.get_mock_member(fake_user()),
+            None
+        ]
 
-        actual_diff = await self.syncer._get_diff(guild)
-        expected_diff = (set(), set(), None)
+        actual_diff = await UserSyncer._get_diff(guild)
+        expected_diff = ([], [], None)
 
         self.assertEqual(actual_diff, expected_diff)
 
@@ -124,20 +188,18 @@ class UserSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
     """Tests for the API requests that sync users."""
 
     def setUp(self):
-        self.bot = helpers.MockBot()
-        self.syncer = UserSyncer(self.bot)
+        patcher = mock.patch("bot.instance", new=helpers.MockBot())
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
     async def test_sync_created_users(self):
         """Only POST requests should be made with the correct payload."""
         users = [fake_user(id=111), fake_user(id=222)]
 
-        user_tuples = {_User(**user) for user in users}
-        diff = _Diff(user_tuples, set(), None)
-        await self.syncer._sync(diff)
+        diff = _Diff(users, [], None)
+        await UserSyncer._sync(diff)
 
-        calls = [mock.call("bot/users", json=user) for user in users]
-        self.bot.api_client.post.assert_has_calls(calls, any_order=True)
-        self.assertEqual(self.bot.api_client.post.call_count, len(users))
+        self.bot.api_client.post.assert_called_once_with("bot/users", json=diff.created)
 
         self.bot.api_client.put.assert_not_called()
         self.bot.api_client.delete.assert_not_called()
@@ -146,13 +208,10 @@ class UserSyncerSyncTests(unittest.IsolatedAsyncioTestCase):
         """Only PUT requests should be made with the correct payload."""
         users = [fake_user(id=111), fake_user(id=222)]
 
-        user_tuples = {_User(**user) for user in users}
-        diff = _Diff(set(), user_tuples, None)
-        await self.syncer._sync(diff)
+        diff = _Diff([], users, None)
+        await UserSyncer._sync(diff)
 
-        calls = [mock.call(f"bot/users/{user['id']}", json=user) for user in users]
-        self.bot.api_client.put.assert_has_calls(calls, any_order=True)
-        self.assertEqual(self.bot.api_client.put.call_count, len(users))
+        self.bot.api_client.patch.assert_called_once_with("bot/users/bulk_patch", json=diff.updated)
 
         self.bot.api_client.post.assert_not_called()
         self.bot.api_client.delete.assert_not_called()
diff --git a/tests/bot/exts/info/test_information.py b/tests/bot/exts/info/test_information.py
index d3f2995fb..daede54c5 100644
--- a/tests/bot/exts/info/test_information.py
+++ b/tests/bot/exts/info/test_information.py
@@ -1,4 +1,3 @@
-import asyncio
 import textwrap
 import unittest
 import unittest.mock
@@ -13,7 +12,7 @@ from tests import helpers
 COG_PATH = "bot.exts.info.information.Information"
 
 
-class InformationCogTests(unittest.TestCase):
+class InformationCogTests(unittest.IsolatedAsyncioTestCase):
     """Tests the Information cog."""
 
     @classmethod
@@ -29,16 +28,14 @@ class InformationCogTests(unittest.TestCase):
         self.ctx = helpers.MockContext()
         self.ctx.author.roles.append(self.moderator_role)
 
-    def test_roles_command_command(self):
+    async def test_roles_command_command(self):
         """Test if the `role_info` command correctly returns the `moderator_role`."""
         self.ctx.guild.roles.append(self.moderator_role)
 
         self.cog.roles_info.can_run = unittest.mock.AsyncMock()
         self.cog.roles_info.can_run.return_value = True
 
-        coroutine = self.cog.roles_info.callback(self.cog, self.ctx)
-
-        self.assertIsNone(asyncio.run(coroutine))
+        self.assertIsNone(await self.cog.roles_info(self.cog, self.ctx))
         self.ctx.send.assert_called_once()
 
         _, kwargs = self.ctx.send.call_args
@@ -48,7 +45,7 @@ class InformationCogTests(unittest.TestCase):
         self.assertEqual(embed.colour, discord.Colour.blurple())
         self.assertEqual(embed.description, f"\n`{self.moderator_role.id}` - {self.moderator_role.mention}\n")
 
-    def test_role_info_command(self):
+    async def test_role_info_command(self):
         """Tests the `role info` command."""
         dummy_role = helpers.MockRole(
             name="Dummy",
@@ -73,9 +70,7 @@ class InformationCogTests(unittest.TestCase):
         self.cog.role_info.can_run = unittest.mock.AsyncMock()
         self.cog.role_info.can_run.return_value = True
 
-        coroutine = self.cog.role_info.callback(self.cog, self.ctx, dummy_role, admin_role)
-
-        self.assertIsNone(asyncio.run(coroutine))
+        self.assertIsNone(await self.cog.role_info(self.cog, self.ctx, dummy_role, admin_role))
 
         self.assertEqual(self.ctx.send.call_count, 2)
 
@@ -97,80 +92,8 @@ class InformationCogTests(unittest.TestCase):
         self.assertEqual(admin_embed.title, "Admins info")
         self.assertEqual(admin_embed.colour, discord.Colour.red())
 
-    @unittest.mock.patch('bot.exts.info.information.time_since')
-    def test_server_info_command(self, time_since_patch):
-        time_since_patch.return_value = '2 days ago'
-
-        self.ctx.guild = helpers.MockGuild(
-            features=('lemons', 'apples'),
-            region="The Moon",
-            roles=[self.moderator_role],
-            channels=[
-                discord.TextChannel(
-                    state={},
-                    guild=self.ctx.guild,
-                    data={'id': 42, 'name': 'lemons-offering', 'position': 22, 'type': 'text'}
-                ),
-                discord.CategoryChannel(
-                    state={},
-                    guild=self.ctx.guild,
-                    data={'id': 5125, 'name': 'the-lemon-collection', 'position': 22, 'type': 'category'}
-                ),
-                discord.VoiceChannel(
-                    state={},
-                    guild=self.ctx.guild,
-                    data={'id': 15290, 'name': 'listen-to-lemon', 'position': 22, 'type': 'voice'}
-                )
-            ],
-            members=[
-                *(helpers.MockMember(status=discord.Status.online) for _ in range(2)),
-                *(helpers.MockMember(status=discord.Status.idle) for _ in range(1)),
-                *(helpers.MockMember(status=discord.Status.dnd) for _ in range(4)),
-                *(helpers.MockMember(status=discord.Status.offline) for _ in range(3)),
-            ],
-            member_count=1_234,
-            icon_url='a-lemon.jpg',
-        )
-
-        coroutine = self.cog.server_info.callback(self.cog, self.ctx)
-        self.assertIsNone(asyncio.run(coroutine))
-
-        time_since_patch.assert_called_once_with(self.ctx.guild.created_at, precision='days')
-        _, kwargs = self.ctx.send.call_args
-        embed = kwargs.pop('embed')
-        self.assertEqual(embed.colour, discord.Colour.blurple())
-        self.assertEqual(
-            embed.description,
-            textwrap.dedent(
-                f"""
-                **Server information**
-                Created: {time_since_patch.return_value}
-                Voice region: {self.ctx.guild.region}
-                Features: {', '.join(self.ctx.guild.features)}
-
-                **Channel counts**
-                Category channels: 1
-                Text channels: 1
-                Voice channels: 1
-                Staff channels: 0
-
-                **Member counts**
-                Members: {self.ctx.guild.member_count:,}
-                Staff members: 0
-                Roles: {len(self.ctx.guild.roles)}
-
-                **Member statuses**
-                {constants.Emojis.status_online} 2
-                {constants.Emojis.status_idle} 1
-                {constants.Emojis.status_dnd} 4
-                {constants.Emojis.status_offline} 3
-                """
-            )
-        )
-        self.assertEqual(embed.thumbnail.url, 'a-lemon.jpg')
-
 
-class UserInfractionHelperMethodTests(unittest.TestCase):
+class UserInfractionHelperMethodTests(unittest.IsolatedAsyncioTestCase):
     """Tests for the helper methods of the `!user` command."""
 
     def setUp(self):
@@ -180,7 +103,7 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
         self.cog = information.Information(self.bot)
         self.member = helpers.MockMember(id=1234)
 
-    def test_user_command_helper_method_get_requests(self):
+    async def test_user_command_helper_method_get_requests(self):
         """The helper methods should form the correct get requests."""
         test_values = (
             {
@@ -202,11 +125,11 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
             endpoint, params = test_value["expected_args"]
 
             with self.subTest(method=helper_method, endpoint=endpoint, params=params):
-                asyncio.run(helper_method(self.member))
+                await helper_method(self.member)
                 self.bot.api_client.get.assert_called_once_with(endpoint, params=params)
                 self.bot.api_client.get.reset_mock()
 
-    def _method_subtests(self, method, test_values, default_header):
+    async def _method_subtests(self, method, test_values, default_header):
         """Helper method that runs the subtests for the different helper methods."""
         for test_value in test_values:
             api_response = test_value["api response"]
@@ -216,11 +139,11 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
                 self.bot.api_client.get.return_value = api_response
 
                 expected_output = "\n".join(expected_lines)
-                actual_output = asyncio.run(method(self.member))
+                actual_output = await method(self.member)
 
                 self.assertEqual((default_header, expected_output), actual_output)
 
-    def test_basic_user_infraction_counts_returns_correct_strings(self):
+    async def test_basic_user_infraction_counts_returns_correct_strings(self):
         """The method should correctly list both the total and active number of non-hidden infractions."""
         test_values = (
             # No infractions means zero counts
@@ -251,9 +174,9 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
 
         header = "Infractions"
 
-        self._method_subtests(self.cog.basic_user_infraction_counts, test_values, header)
+        await self._method_subtests(self.cog.basic_user_infraction_counts, test_values, header)
 
-    def test_expanded_user_infraction_counts_returns_correct_strings(self):
+    async def test_expanded_user_infraction_counts_returns_correct_strings(self):
         """The method should correctly list the total and active number of all infractions split by infraction type."""
         test_values = (
             {
@@ -306,9 +229,9 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
 
         header = "Infractions"
 
-        self._method_subtests(self.cog.expanded_user_infraction_counts, test_values, header)
+        await self._method_subtests(self.cog.expanded_user_infraction_counts, test_values, header)
 
-    def test_user_nomination_counts_returns_correct_strings(self):
+    async def test_user_nomination_counts_returns_correct_strings(self):
         """The method should list the number of active and historical nominations for the user."""
         test_values = (
             {
@@ -336,12 +259,12 @@ class UserInfractionHelperMethodTests(unittest.TestCase):
 
         header = "Nominations"
 
-        self._method_subtests(self.cog.user_nomination_counts, test_values, header)
+        await self._method_subtests(self.cog.user_nomination_counts, test_values, header)
 
 
 @unittest.mock.patch("bot.exts.info.information.time_since", new=unittest.mock.MagicMock(return_value="1 year ago"))
 @unittest.mock.patch("bot.exts.info.information.constants.MODERATION_CHANNELS", new=[50])
-class UserEmbedTests(unittest.TestCase):
+class UserEmbedTests(unittest.IsolatedAsyncioTestCase):
     """Tests for the creation of the `!user` embed."""
 
     def setUp(self):
@@ -354,14 +277,14 @@ class UserEmbedTests(unittest.TestCase):
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_uses_string_representation_of_user_in_title_if_nick_is_not_available(self):
+    async def test_create_user_embed_uses_string_representation_of_user_in_title_if_nick_is_not_available(self):
         """The embed should use the string representation of the user if they don't have a nick."""
         ctx = helpers.MockContext(channel=helpers.MockTextChannel(id=1))
         user = helpers.MockMember()
         user.nick = None
         user.__str__ = unittest.mock.Mock(return_value="Mr. Hemlock")
 
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         self.assertEqual(embed.title, "Mr. Hemlock")
 
@@ -369,14 +292,14 @@ class UserEmbedTests(unittest.TestCase):
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_uses_nick_in_title_if_available(self):
+    async def test_create_user_embed_uses_nick_in_title_if_available(self):
         """The embed should use the nick if it's available."""
         ctx = helpers.MockContext(channel=helpers.MockTextChannel(id=1))
         user = helpers.MockMember()
         user.nick = "Cat lover"
         user.__str__ = unittest.mock.Mock(return_value="Mr. Hemlock")
 
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         self.assertEqual(embed.title, "Cat lover (Mr. Hemlock)")
 
@@ -384,7 +307,7 @@ class UserEmbedTests(unittest.TestCase):
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_ignores_everyone_role(self):
+    async def test_create_user_embed_ignores_everyone_role(self):
         """Created `!user` embeds should not contain mention of the @everyone-role."""
         ctx = helpers.MockContext(channel=helpers.MockTextChannel(id=1))
         admins_role = helpers.MockRole(name='Admins')
@@ -393,14 +316,18 @@ class UserEmbedTests(unittest.TestCase):
         # A `MockMember` has the @Everyone role by default; we add the Admins to that.
         user = helpers.MockMember(roles=[admins_role], top_role=admins_role)
 
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         self.assertIn("&Admins", embed.fields[1].value)
         self.assertNotIn("&Everyone", embed.fields[1].value)
 
     @unittest.mock.patch(f"{COG_PATH}.expanded_user_infraction_counts", new_callable=unittest.mock.AsyncMock)
     @unittest.mock.patch(f"{COG_PATH}.user_nomination_counts", new_callable=unittest.mock.AsyncMock)
-    def test_create_user_embed_expanded_information_in_moderation_channels(self, nomination_counts, infraction_counts):
+    async def test_create_user_embed_expanded_information_in_moderation_channels(
+            self,
+            nomination_counts,
+            infraction_counts
+    ):
         """The embed should contain expanded infractions and nomination info in mod channels."""
         ctx = helpers.MockContext(channel=helpers.MockTextChannel(id=50))
 
@@ -411,7 +338,7 @@ class UserEmbedTests(unittest.TestCase):
         nomination_counts.return_value = ("Nominations", "nomination info")
 
         user = helpers.MockMember(id=314, roles=[moderators_role], top_role=moderators_role)
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         infraction_counts.assert_called_once_with(user)
         nomination_counts.assert_called_once_with(user)
@@ -434,7 +361,7 @@ class UserEmbedTests(unittest.TestCase):
         )
 
     @unittest.mock.patch(f"{COG_PATH}.basic_user_infraction_counts", new_callable=unittest.mock.AsyncMock)
-    def test_create_user_embed_basic_information_outside_of_moderation_channels(self, infraction_counts):
+    async def test_create_user_embed_basic_information_outside_of_moderation_channels(self, infraction_counts):
         """The embed should contain only basic infraction data outside of mod channels."""
         ctx = helpers.MockContext(channel=helpers.MockTextChannel(id=100))
 
@@ -444,7 +371,7 @@ class UserEmbedTests(unittest.TestCase):
         infraction_counts.return_value = ("Infractions", "basic infractions info")
 
         user = helpers.MockMember(id=314, roles=[moderators_role], top_role=moderators_role)
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         infraction_counts.assert_called_once_with(user)
 
@@ -467,14 +394,14 @@ class UserEmbedTests(unittest.TestCase):
 
         self.assertEqual(
             "basic infractions info",
-            embed.fields[3].value
+            embed.fields[2].value
         )
 
     @unittest.mock.patch(
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_uses_top_role_colour_when_user_has_roles(self):
+    async def test_create_user_embed_uses_top_role_colour_when_user_has_roles(self):
         """The embed should be created with the colour of the top role, if a top role is available."""
         ctx = helpers.MockContext()
 
@@ -482,7 +409,7 @@ class UserEmbedTests(unittest.TestCase):
         moderators_role.colour = 100
 
         user = helpers.MockMember(id=314, roles=[moderators_role], top_role=moderators_role)
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         self.assertEqual(embed.colour, discord.Colour(moderators_role.colour))
 
@@ -490,12 +417,12 @@ class UserEmbedTests(unittest.TestCase):
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_uses_blurple_colour_when_user_has_no_roles(self):
+    async def test_create_user_embed_uses_blurple_colour_when_user_has_no_roles(self):
         """The embed should be created with a blurple colour if the user has no assigned roles."""
         ctx = helpers.MockContext()
 
         user = helpers.MockMember(id=217)
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         self.assertEqual(embed.colour, discord.Colour.blurple())
 
@@ -503,20 +430,20 @@ class UserEmbedTests(unittest.TestCase):
         f"{COG_PATH}.basic_user_infraction_counts",
         new=unittest.mock.AsyncMock(return_value=("Infractions", "basic infractions"))
     )
-    def test_create_user_embed_uses_png_format_of_user_avatar_as_thumbnail(self):
+    async def test_create_user_embed_uses_png_format_of_user_avatar_as_thumbnail(self):
         """The embed thumbnail should be set to the user's avatar in `png` format."""
         ctx = helpers.MockContext()
 
         user = helpers.MockMember(id=217)
         user.avatar_url_as.return_value = "avatar url"
-        embed = asyncio.run(self.cog.create_user_embed(ctx, user))
+        embed = await self.cog.create_user_embed(ctx, user)
 
         user.avatar_url_as.assert_called_once_with(static_format="png")
         self.assertEqual(embed.thumbnail.url, "avatar url")
 
 
 @unittest.mock.patch("bot.exts.info.information.constants")
-class UserCommandTests(unittest.TestCase):
+class UserCommandTests(unittest.IsolatedAsyncioTestCase):
     """Tests for the `!user` command."""
 
     def setUp(self):
@@ -536,16 +463,16 @@ class UserCommandTests(unittest.TestCase):
         # used as a default value for a parameter, which gets defined upon import.
         self.bot_command_channel = helpers.MockTextChannel(id=constants.Channels.bot_commands)
 
-    def test_regular_member_cannot_target_another_member(self, constants):
+    async def test_regular_member_cannot_target_another_member(self, constants):
         """A regular user should not be able to use `!user` targeting another user."""
         constants.MODERATION_ROLES = [self.moderator_role.id]
         ctx = helpers.MockContext(author=self.author)
 
-        asyncio.run(self.cog.user_info.callback(self.cog, ctx, self.target))
+        await self.cog.user_info(self.cog, ctx, self.target)
 
         ctx.send.assert_called_once_with("You may not use this command on users other than yourself.")
 
-    def test_regular_member_cannot_use_command_outside_of_bot_commands(self, constants):
+    async def test_regular_member_cannot_use_command_outside_of_bot_commands(self, constants):
         """A regular user should not be able to use this command outside of bot-commands."""
         constants.MODERATION_ROLES = [self.moderator_role.id]
         constants.STAFF_ROLES = [self.moderator_role.id]
@@ -553,49 +480,49 @@ class UserCommandTests(unittest.TestCase):
 
         msg = "Sorry, but you may only use this command within <#50>."
         with self.assertRaises(InWhitelistCheckFailure, msg=msg):
-            asyncio.run(self.cog.user_info.callback(self.cog, ctx))
+            await self.cog.user_info(self.cog, ctx)
 
     @unittest.mock.patch("bot.exts.info.information.Information.create_user_embed")
-    def test_regular_user_may_use_command_in_bot_commands_channel(self, create_embed, constants):
+    async def test_regular_user_may_use_command_in_bot_commands_channel(self, create_embed, constants):
         """A regular user should be allowed to use `!user` targeting themselves in bot-commands."""
         constants.STAFF_ROLES = [self.moderator_role.id]
         ctx = helpers.MockContext(author=self.author, channel=self.bot_command_channel)
 
-        asyncio.run(self.cog.user_info.callback(self.cog, ctx))
+        await self.cog.user_info(self.cog, ctx)
 
         create_embed.assert_called_once_with(ctx, self.author)
         ctx.send.assert_called_once()
 
     @unittest.mock.patch("bot.exts.info.information.Information.create_user_embed")
-    def test_regular_user_can_explicitly_target_themselves(self, create_embed, _):
+    async def test_regular_user_can_explicitly_target_themselves(self, create_embed, _):
         """A user should target itself with `!user` when a `user` argument was not provided."""
         constants.STAFF_ROLES = [self.moderator_role.id]
         ctx = helpers.MockContext(author=self.author, channel=self.bot_command_channel)
 
-        asyncio.run(self.cog.user_info.callback(self.cog, ctx, self.author))
+        await self.cog.user_info(self.cog, ctx, self.author)
 
         create_embed.assert_called_once_with(ctx, self.author)
         ctx.send.assert_called_once()
 
     @unittest.mock.patch("bot.exts.info.information.Information.create_user_embed")
-    def test_staff_members_can_bypass_channel_restriction(self, create_embed, constants):
+    async def test_staff_members_can_bypass_channel_restriction(self, create_embed, constants):
         """Staff members should be able to bypass the bot-commands channel restriction."""
         constants.STAFF_ROLES = [self.moderator_role.id]
         ctx = helpers.MockContext(author=self.moderator, channel=helpers.MockTextChannel(id=200))
 
-        asyncio.run(self.cog.user_info.callback(self.cog, ctx))
+        await self.cog.user_info(self.cog, ctx)
 
         create_embed.assert_called_once_with(ctx, self.moderator)
         ctx.send.assert_called_once()
 
     @unittest.mock.patch("bot.exts.info.information.Information.create_user_embed")
-    def test_moderators_can_target_another_member(self, create_embed, constants):
+    async def test_moderators_can_target_another_member(self, create_embed, constants):
         """A moderator should be able to use `!user` targeting another user."""
         constants.MODERATION_ROLES = [self.moderator_role.id]
         constants.STAFF_ROLES = [self.moderator_role.id]
         ctx = helpers.MockContext(author=self.moderator, channel=helpers.MockTextChannel(id=50))
 
-        asyncio.run(self.cog.user_info.callback(self.cog, ctx, self.target))
+        await self.cog.user_info(self.cog, ctx, self.target)
 
         create_embed.assert_called_once_with(ctx, self.target)
         ctx.send.assert_called_once()
diff --git a/tests/bot/exts/moderation/infraction/test_infractions.py b/tests/bot/exts/moderation/infraction/test_infractions.py
index be1b649e1..bf557a484 100644
--- a/tests/bot/exts/moderation/infraction/test_infractions.py
+++ b/tests/bot/exts/moderation/infraction/test_infractions.py
@@ -1,7 +1,8 @@
 import textwrap
 import unittest
-from unittest.mock import AsyncMock, Mock, patch
+from unittest.mock import AsyncMock, MagicMock, Mock, patch
 
+from bot.constants import Event
 from bot.exts.moderation.infraction.infractions import Infractions
 from tests.helpers import MockBot, MockContext, MockGuild, MockMember, MockRole
 
@@ -53,3 +54,148 @@ class TruncationTests(unittest.IsolatedAsyncioTestCase):
         self.cog.apply_infraction.assert_awaited_once_with(
             self.ctx, {"foo": "bar"}, self.target, self.target.kick.return_value
         )
+
+
+@patch("bot.exts.moderation.infraction.infractions.constants.Roles.voice_verified", new=123456)
+class VoiceBanTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for voice ban related functions and commands."""
+
+    def setUp(self):
+        self.bot = MockBot()
+        self.mod = MockMember(top_role=10)
+        self.user = MockMember(top_role=1, roles=[MockRole(id=123456)])
+        self.guild = MockGuild()
+        self.ctx = MockContext(bot=self.bot, author=self.mod)
+        self.cog = Infractions(self.bot)
+
+    async def test_permanent_voice_ban(self):
+        """Should call voice ban applying function without expiry."""
+        self.cog.apply_voice_ban = AsyncMock()
+        self.assertIsNone(await self.cog.voiceban(self.cog, self.ctx, self.user, reason="foobar"))
+        self.cog.apply_voice_ban.assert_awaited_once_with(self.ctx, self.user, "foobar")
+
+    async def test_temporary_voice_ban(self):
+        """Should call voice ban applying function with expiry."""
+        self.cog.apply_voice_ban = AsyncMock()
+        self.assertIsNone(await self.cog.tempvoiceban(self.cog, self.ctx, self.user, "baz", reason="foobar"))
+        self.cog.apply_voice_ban.assert_awaited_once_with(self.ctx, self.user, "foobar", expires_at="baz")
+
+    async def test_voice_unban(self):
+        """Should call infraction pardoning function."""
+        self.cog.pardon_infraction = AsyncMock()
+        self.assertIsNone(await self.cog.unvoiceban(self.cog, self.ctx, self.user))
+        self.cog.pardon_infraction.assert_awaited_once_with(self.ctx, "voice_ban", self.user)
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_user_have_active_infraction(self, get_active_infraction, post_infraction_mock):
+        """Should return early when user already have Voice Ban infraction."""
+        get_active_infraction.return_value = {"foo": "bar"}
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar"))
+        get_active_infraction.assert_awaited_once_with(self.ctx, self.user, "voice_ban")
+        post_infraction_mock.assert_not_awaited()
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_infraction_post_failed(self, get_active_infraction, post_infraction_mock):
+        """Should return early when posting infraction fails."""
+        self.cog.mod_log.ignore = MagicMock()
+        get_active_infraction.return_value = None
+        post_infraction_mock.return_value = None
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar"))
+        post_infraction_mock.assert_awaited_once()
+        self.cog.mod_log.ignore.assert_not_called()
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_infraction_post_add_kwargs(self, get_active_infraction, post_infraction_mock):
+        """Should pass all kwargs passed to apply_voice_ban to post_infraction."""
+        get_active_infraction.return_value = None
+        # We don't want that this continue yet
+        post_infraction_mock.return_value = None
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar", my_kwarg=23))
+        post_infraction_mock.assert_awaited_once_with(
+            self.ctx, self.user, "voice_ban", "foobar", active=True, my_kwarg=23
+        )
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_mod_log_ignore(self, get_active_infraction, post_infraction_mock):
+        """Should ignore Voice Verified role removing."""
+        self.cog.mod_log.ignore = MagicMock()
+        self.cog.apply_infraction = AsyncMock()
+        self.user.remove_roles = MagicMock(return_value="my_return_value")
+
+        get_active_infraction.return_value = None
+        post_infraction_mock.return_value = {"foo": "bar"}
+
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar"))
+        self.cog.mod_log.ignore.assert_called_once_with(Event.member_update, self.user.id)
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_apply_infraction(self, get_active_infraction, post_infraction_mock):
+        """Should ignore Voice Verified role removing."""
+        self.cog.mod_log.ignore = MagicMock()
+        self.cog.apply_infraction = AsyncMock()
+        self.user.remove_roles = MagicMock(return_value="my_return_value")
+
+        get_active_infraction.return_value = None
+        post_infraction_mock.return_value = {"foo": "bar"}
+
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar"))
+        self.user.remove_roles.assert_called_once_with(self.cog._voice_verified_role, reason="foobar")
+        self.cog.apply_infraction.assert_awaited_once_with(self.ctx, {"foo": "bar"}, self.user, "my_return_value")
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.post_infraction")
+    @patch("bot.exts.moderation.infraction.infractions._utils.get_active_infraction")
+    async def test_voice_ban_truncate_reason(self, get_active_infraction, post_infraction_mock):
+        """Should truncate reason for voice ban."""
+        self.cog.mod_log.ignore = MagicMock()
+        self.cog.apply_infraction = AsyncMock()
+        self.user.remove_roles = MagicMock(return_value="my_return_value")
+
+        get_active_infraction.return_value = None
+        post_infraction_mock.return_value = {"foo": "bar"}
+
+        self.assertIsNone(await self.cog.apply_voice_ban(self.ctx, self.user, "foobar" * 3000))
+        self.user.remove_roles.assert_called_once_with(
+            self.cog._voice_verified_role, reason=textwrap.shorten("foobar" * 3000, 512, placeholder="...")
+        )
+        self.cog.apply_infraction.assert_awaited_once_with(self.ctx, {"foo": "bar"}, self.user, "my_return_value")
+
+    async def test_voice_unban_user_not_found(self):
+        """Should include info to return dict when user was not found from guild."""
+        self.guild.get_member.return_value = None
+        result = await self.cog.pardon_voice_ban(self.user.id, self.guild, "foobar")
+        self.assertEqual(result, {"Info": "User was not found in the guild."})
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.notify_pardon")
+    @patch("bot.exts.moderation.infraction.infractions.format_user")
+    async def test_voice_unban_user_found(self, format_user_mock, notify_pardon_mock):
+        """Should add role back with ignoring, notify user and return log dictionary.."""
+        self.guild.get_member.return_value = self.user
+        notify_pardon_mock.return_value = True
+        format_user_mock.return_value = "my-user"
+
+        result = await self.cog.pardon_voice_ban(self.user.id, self.guild, "foobar")
+        self.assertEqual(result, {
+            "Member": "my-user",
+            "DM": "Sent"
+        })
+        notify_pardon_mock.assert_awaited_once()
+
+    @patch("bot.exts.moderation.infraction.infractions._utils.notify_pardon")
+    @patch("bot.exts.moderation.infraction.infractions.format_user")
+    async def test_voice_unban_dm_fail(self, format_user_mock, notify_pardon_mock):
+        """Should add role back with ignoring, notify user and return log dictionary.."""
+        self.guild.get_member.return_value = self.user
+        notify_pardon_mock.return_value = False
+        format_user_mock.return_value = "my-user"
+
+        result = await self.cog.pardon_voice_ban(self.user.id, self.guild, "foobar")
+        self.assertEqual(result, {
+            "Member": "my-user",
+            "DM": "**Failed**"
+        })
+        notify_pardon_mock.assert_awaited_once()
diff --git a/tests/bot/exts/moderation/test_silence.py b/tests/bot/exts/moderation/test_silence.py
index e2d44c637..104293d8e 100644
--- a/tests/bot/exts/moderation/test_silence.py
+++ b/tests/bot/exts/moderation/test_silence.py
@@ -1,23 +1,49 @@
+import asyncio
 import unittest
+from datetime import datetime, timezone
 from unittest import mock
-from unittest.mock import MagicMock, Mock
+from unittest.mock import Mock
 
+from async_rediscache import RedisSession
 from discord import PermissionOverwrite
 
-from bot.constants import Channels, Emojis, Guild, Roles
-from bot.exts.moderation.silence import Silence, SilenceNotifier
-from tests.helpers import MockBot, MockContext, MockTextChannel
+from bot.constants import Channels, Guild, Roles
+from bot.exts.moderation import silence
+from tests.helpers import MockBot, MockContext, MockTextChannel, autospec
+
+redis_session = None
+redis_loop = asyncio.get_event_loop()
+
+
+def setUpModule():  # noqa: N802
+    """Create and connect to the fakeredis session."""
+    global redis_session
+    redis_session = RedisSession(use_fakeredis=True)
+    redis_loop.run_until_complete(redis_session.connect())
+
+
+def tearDownModule():  # noqa: N802
+    """Close the fakeredis session."""
+    if redis_session:
+        redis_loop.run_until_complete(redis_session.close())
+
+
+# Have to subclass it because builtins can't be patched.
+class PatchedDatetime(datetime):
+    """A datetime object with a mocked now() function."""
+
+    now = mock.create_autospec(datetime, "now")
 
 
 class SilenceNotifierTests(unittest.IsolatedAsyncioTestCase):
     def setUp(self) -> None:
         self.alert_channel = MockTextChannel()
-        self.notifier = SilenceNotifier(self.alert_channel)
+        self.notifier = silence.SilenceNotifier(self.alert_channel)
         self.notifier.stop = self.notifier_stop_mock = Mock()
         self.notifier.start = self.notifier_start_mock = Mock()
 
     def test_add_channel_adds_channel(self):
-        """Channel in FirstHash with current loop is added to internal set."""
+        """Channel is added to `_silenced_channels` with the current loop."""
         channel = Mock()
         with mock.patch.object(self.notifier, "_silenced_channels") as silenced_channels:
             self.notifier.add_channel(channel)
@@ -35,7 +61,7 @@ class SilenceNotifierTests(unittest.IsolatedAsyncioTestCase):
         self.notifier_start_mock.assert_not_called()
 
     def test_remove_channel_removes_channel(self):
-        """Channel in FirstHash is removed from `_silenced_channels`."""
+        """Channel is removed from `_silenced_channels`."""
         channel = Mock()
         with mock.patch.object(self.notifier, "_silenced_channels") as silenced_channels:
             self.notifier.remove_channel(channel)
@@ -59,7 +85,9 @@ class SilenceNotifierTests(unittest.IsolatedAsyncioTestCase):
             with self.subTest(current_loop=current_loop):
                 with mock.patch.object(self.notifier, "_current_loop", new=current_loop):
                     await self.notifier._notifier()
-                self.alert_channel.send.assert_called_once_with(f"<@&{Roles.moderators}> currently silenced channels: ")
+                self.alert_channel.send.assert_called_once_with(
+                    f"<@&{Roles.moderators}> currently silenced channels: "
+                )
             self.alert_channel.send.reset_mock()
 
     async def test_notifier_skips_alert(self):
@@ -72,192 +100,403 @@ class SilenceNotifierTests(unittest.IsolatedAsyncioTestCase):
                     self.alert_channel.send.assert_not_called()
 
 
-class SilenceTests(unittest.IsolatedAsyncioTestCase):
+@autospec(silence.Silence, "previous_overwrites", "unsilence_timestamps", pass_mocks=False)
+class SilenceCogTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for the general functionality of the Silence cog."""
+
+    @autospec(silence, "Scheduler", pass_mocks=False)
     def setUp(self) -> None:
         self.bot = MockBot()
-        self.cog = Silence(self.bot)
-        self.ctx = MockContext()
-        self.cog._verified_role = None
-        # Set event so command callbacks can continue.
-        self.cog._get_instance_vars_event.set()
+        self.cog = silence.Silence(self.bot)
 
-    async def test_instance_vars_got_guild(self):
+    @autospec(silence, "SilenceNotifier", pass_mocks=False)
+    async def test_async_init_got_guild(self):
         """Bot got guild after it became available."""
-        await self.cog._get_instance_vars()
-        self.bot.wait_until_guild_available.assert_called_once()
+        await self.cog._async_init()
+        self.bot.wait_until_guild_available.assert_awaited_once()
         self.bot.get_guild.assert_called_once_with(Guild.id)
 
-    async def test_instance_vars_got_role(self):
+    @autospec(silence, "SilenceNotifier", pass_mocks=False)
+    async def test_async_init_got_role(self):
         """Got `Roles.verified` role from guild."""
-        await self.cog._get_instance_vars()
         guild = self.bot.get_guild()
-        guild.get_role.assert_called_once_with(Roles.verified)
+        guild.get_role.side_effect = lambda id_: Mock(id=id_)
 
-    async def test_instance_vars_got_channels(self):
+        await self.cog._async_init()
+        self.assertEqual(self.cog._verified_role.id, Roles.verified)
+
+    @autospec(silence, "SilenceNotifier", pass_mocks=False)
+    async def test_async_init_got_channels(self):
         """Got channels from bot."""
-        await self.cog._get_instance_vars()
-        self.bot.get_channel.called_once_with(Channels.mod_alerts)
-        self.bot.get_channel.called_once_with(Channels.mod_log)
+        self.bot.get_channel.side_effect = lambda id_: MockTextChannel(id=id_)
+
+        await self.cog._async_init()
+        self.assertEqual(self.cog._mod_alerts_channel.id, Channels.mod_alerts)
 
-    @mock.patch("bot.exts.moderation.silence.SilenceNotifier")
-    async def test_instance_vars_got_notifier(self, notifier):
+    @autospec(silence, "SilenceNotifier")
+    async def test_async_init_got_notifier(self, notifier):
         """Notifier was started with channel."""
-        mod_log = MockTextChannel()
-        self.bot.get_channel.side_effect = (None, mod_log)
-        await self.cog._get_instance_vars()
-        notifier.assert_called_once_with(mod_log)
-        self.bot.get_channel.side_effect = None
-
-    async def test_silence_sent_correct_discord_message(self):
-        """Check if proper message was sent when called with duration in channel with previous state."""
+        self.bot.get_channel.side_effect = lambda id_: MockTextChannel(id=id_)
+
+        await self.cog._async_init()
+        notifier.assert_called_once_with(MockTextChannel(id=Channels.mod_log))
+        self.assertEqual(self.cog.notifier, notifier.return_value)
+
+    @autospec(silence, "SilenceNotifier", pass_mocks=False)
+    async def test_async_init_rescheduled(self):
+        """`_reschedule_` coroutine was awaited."""
+        self.cog._reschedule = mock.create_autospec(self.cog._reschedule)
+        await self.cog._async_init()
+        self.cog._reschedule.assert_awaited_once_with()
+
+    def test_cog_unload_cancelled_tasks(self):
+        """The init task was cancelled."""
+        self.cog._init_task = asyncio.Future()
+        self.cog.cog_unload()
+
+        # It's too annoying to test cancel_all since it's a done callback and wrapped in a lambda.
+        self.assertTrue(self.cog._init_task.cancelled())
+
+    @autospec("discord.ext.commands", "has_any_role")
+    @mock.patch.object(silence, "MODERATION_ROLES", new=(1, 2, 3))
+    async def test_cog_check(self, role_check):
+        """Role check was called with `MODERATION_ROLES`"""
+        ctx = MockContext()
+        role_check.return_value.predicate = mock.AsyncMock()
+
+        await self.cog.cog_check(ctx)
+        role_check.assert_called_once_with(*(1, 2, 3))
+        role_check.return_value.predicate.assert_awaited_once_with(ctx)
+
+
+@autospec(silence.Silence, "previous_overwrites", "unsilence_timestamps", pass_mocks=False)
+class RescheduleTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for the rescheduling of cached unsilences."""
+
+    @autospec(silence, "Scheduler", "SilenceNotifier", pass_mocks=False)
+    def setUp(self):
+        self.bot = MockBot()
+        self.cog = silence.Silence(self.bot)
+        self.cog._unsilence_wrapper = mock.create_autospec(self.cog._unsilence_wrapper)
+
+        with mock.patch.object(self.cog, "_reschedule", autospec=True):
+            asyncio.run(self.cog._async_init())  # Populate instance attributes.
+
+    async def test_skipped_missing_channel(self):
+        """Did nothing because the channel couldn't be retrieved."""
+        self.cog.unsilence_timestamps.items.return_value = [(123, -1), (123, 1), (123, 10000000000)]
+        self.bot.get_channel.return_value = None
+
+        await self.cog._reschedule()
+
+        self.cog.notifier.add_channel.assert_not_called()
+        self.cog._unsilence_wrapper.assert_not_called()
+        self.cog.scheduler.schedule_later.assert_not_called()
+
+    async def test_added_permanent_to_notifier(self):
+        """Permanently silenced channels were added to the notifier."""
+        channels = [MockTextChannel(id=123), MockTextChannel(id=456)]
+        self.bot.get_channel.side_effect = channels
+        self.cog.unsilence_timestamps.items.return_value = [(123, -1), (456, -1)]
+
+        await self.cog._reschedule()
+
+        self.cog.notifier.add_channel.assert_any_call(channels[0])
+        self.cog.notifier.add_channel.assert_any_call(channels[1])
+
+        self.cog._unsilence_wrapper.assert_not_called()
+        self.cog.scheduler.schedule_later.assert_not_called()
+
+    async def test_unsilenced_expired(self):
+        """Unsilenced expired silences."""
+        channels = [MockTextChannel(id=123), MockTextChannel(id=456)]
+        self.bot.get_channel.side_effect = channels
+        self.cog.unsilence_timestamps.items.return_value = [(123, 100), (456, 200)]
+
+        await self.cog._reschedule()
+
+        self.cog._unsilence_wrapper.assert_any_call(channels[0])
+        self.cog._unsilence_wrapper.assert_any_call(channels[1])
+
+        self.cog.notifier.add_channel.assert_not_called()
+        self.cog.scheduler.schedule_later.assert_not_called()
+
+    @mock.patch.object(silence, "datetime", new=PatchedDatetime)
+    async def test_rescheduled_active(self):
+        """Rescheduled active silences."""
+        channels = [MockTextChannel(id=123), MockTextChannel(id=456)]
+        self.bot.get_channel.side_effect = channels
+        self.cog.unsilence_timestamps.items.return_value = [(123, 2000), (456, 3000)]
+        silence.datetime.now.return_value = datetime.fromtimestamp(1000, tz=timezone.utc)
+
+        self.cog._unsilence_wrapper = mock.MagicMock()
+        unsilence_return = self.cog._unsilence_wrapper.return_value
+
+        await self.cog._reschedule()
+
+        # Yuck.
+        calls = [mock.call(1000, 123, unsilence_return), mock.call(2000, 456, unsilence_return)]
+        self.cog.scheduler.schedule_later.assert_has_calls(calls)
+
+        unsilence_calls = [mock.call(channel) for channel in channels]
+        self.cog._unsilence_wrapper.assert_has_calls(unsilence_calls)
+
+        self.cog.notifier.add_channel.assert_not_called()
+
+
+@autospec(silence.Silence, "previous_overwrites", "unsilence_timestamps", pass_mocks=False)
+class SilenceTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for the silence command and its related helper methods."""
+
+    @autospec(silence.Silence, "_reschedule", pass_mocks=False)
+    @autospec(silence, "Scheduler", "SilenceNotifier", pass_mocks=False)
+    def setUp(self) -> None:
+        self.bot = MockBot()
+        self.cog = silence.Silence(self.bot)
+        self.cog._init_task = asyncio.Future()
+        self.cog._init_task.set_result(None)
+
+        # Avoid unawaited coroutine warnings.
+        self.cog.scheduler.schedule_later.side_effect = lambda delay, task_id, coro: coro.close()
+
+        asyncio.run(self.cog._async_init())  # Populate instance attributes.
+
+        self.channel = MockTextChannel()
+        self.overwrite = PermissionOverwrite(stream=True, send_messages=True, add_reactions=False)
+        self.channel.overwrites_for.return_value = self.overwrite
+
+    async def test_sent_correct_message(self):
+        """Appropriate failure/success message was sent by the command."""
         test_cases = (
-            (0.0001, f"{Emojis.check_mark} silenced current channel for 0.0001 minute(s).", True,),
-            (None, f"{Emojis.check_mark} silenced current channel indefinitely.", True,),
-            (5, f"{Emojis.cross_mark} current channel is already silenced.", False,),
+            (0.0001, silence.MSG_SILENCE_SUCCESS.format(duration=0.0001), True,),
+            (None, silence.MSG_SILENCE_PERMANENT, True,),
+            (5, silence.MSG_SILENCE_FAIL, False,),
         )
-        for duration, result_message, _silence_patch_return in test_cases:
-            with self.subTest(
-                silence_duration=duration,
-                result_message=result_message,
-                starting_unsilenced_state=_silence_patch_return
-            ):
-                with mock.patch.object(self.cog, "_silence", return_value=_silence_patch_return):
-                    await self.cog.silence.callback(self.cog, self.ctx, duration)
-                    self.ctx.send.assert_called_once_with(result_message)
-            self.ctx.reset_mock()
-
-    async def test_unsilence_sent_correct_discord_message(self):
-        """Check if proper message was sent when unsilencing channel."""
-        test_cases = (
-            (True, f"{Emojis.check_mark} unsilenced current channel."),
-            (False, f"{Emojis.cross_mark} current channel was not silenced.")
+        for duration, message, was_silenced in test_cases:
+            ctx = MockContext()
+            with mock.patch.object(self.cog, "_set_silence_overwrites", return_value=was_silenced):
+                with self.subTest(was_silenced=was_silenced, message=message, duration=duration):
+                    await self.cog.silence.callback(self.cog, ctx, duration)
+                    ctx.send.assert_called_once_with(message)
+
+    async def test_skipped_already_silenced(self):
+        """Permissions were not set and `False` was returned for an already silenced channel."""
+        subtests = (
+            (False, PermissionOverwrite(send_messages=False, add_reactions=False)),
+            (True, PermissionOverwrite(send_messages=True, add_reactions=True)),
+            (True, PermissionOverwrite(send_messages=False, add_reactions=False)),
         )
-        for _unsilence_patch_return, result_message in test_cases:
-            with self.subTest(
-                starting_silenced_state=_unsilence_patch_return,
-                result_message=result_message
-            ):
-                with mock.patch.object(self.cog, "_unsilence", return_value=_unsilence_patch_return):
-                    await self.cog.unsilence.callback(self.cog, self.ctx)
-                    self.ctx.send.assert_called_once_with(result_message)
-            self.ctx.reset_mock()
-
-    async def test_silence_private_for_false(self):
-        """Permissions are not set and `False` is returned in an already silenced channel."""
-        perm_overwrite = Mock(send_messages=False)
-        channel = Mock(overwrites_for=Mock(return_value=perm_overwrite))
-
-        self.assertFalse(await self.cog._silence(channel, True, None))
-        channel.set_permissions.assert_not_called()
 
-    async def test_silence_private_silenced_channel(self):
-        """Channel had `send_message` permissions revoked."""
-        channel = MockTextChannel()
-        self.assertTrue(await self.cog._silence(channel, False, None))
-        channel.set_permissions.assert_called_once()
-        self.assertFalse(channel.set_permissions.call_args.kwargs['send_messages'])
+        for contains, overwrite in subtests:
+            with self.subTest(contains=contains, overwrite=overwrite):
+                self.cog.scheduler.__contains__.return_value = contains
+                channel = MockTextChannel()
+                channel.overwrites_for.return_value = overwrite
+
+                self.assertFalse(await self.cog._set_silence_overwrites(channel))
+                channel.set_permissions.assert_not_called()
+
+    async def test_silenced_channel(self):
+        """Channel had `send_message` and `add_reactions` permissions revoked for verified role."""
+        self.assertTrue(await self.cog._set_silence_overwrites(self.channel))
+        self.assertFalse(self.overwrite.send_messages)
+        self.assertFalse(self.overwrite.add_reactions)
+        self.channel.set_permissions.assert_awaited_once_with(
+            self.cog._verified_role,
+            overwrite=self.overwrite
+        )
 
-    async def test_silence_private_preserves_permissions(self):
-        """Previous permissions were preserved when channel was silenced."""
-        channel = MockTextChannel()
-        # Set up mock channel permission state.
-        mock_permissions = PermissionOverwrite()
-        mock_permissions_dict = dict(mock_permissions)
-        channel.overwrites_for.return_value = mock_permissions
-        await self.cog._silence(channel, False, None)
-        new_permissions = channel.set_permissions.call_args.kwargs
-        # Remove 'send_messages' key because it got changed in the method.
-        del new_permissions['send_messages']
-        del mock_permissions_dict['send_messages']
-        self.assertDictEqual(mock_permissions_dict, new_permissions)
-
-    async def test_silence_private_notifier(self):
-        """Channel should be added to notifier with `persistent` set to `True`, and the other way around."""
-        channel = MockTextChannel()
-        with mock.patch.object(self.cog, "notifier", create=True):
-            with self.subTest(persistent=True):
-                await self.cog._silence(channel, True, None)
-                self.cog.notifier.add_channel.assert_called_once()
-
-        with mock.patch.object(self.cog, "notifier", create=True):
-            with self.subTest(persistent=False):
-                await self.cog._silence(channel, False, None)
-                self.cog.notifier.add_channel.assert_not_called()
-
-    async def test_silence_private_added_muted_channel(self):
-        """Channel was added to `muted_channels` on silence."""
+    async def test_preserved_other_overwrites(self):
+        """Channel's other unrelated overwrites were not changed."""
+        prev_overwrite_dict = dict(self.overwrite)
+        await self.cog._set_silence_overwrites(self.channel)
+        new_overwrite_dict = dict(self.overwrite)
+
+        # Remove 'send_messages' & 'add_reactions' keys because they were changed by the method.
+        del prev_overwrite_dict['send_messages']
+        del prev_overwrite_dict['add_reactions']
+        del new_overwrite_dict['send_messages']
+        del new_overwrite_dict['add_reactions']
+
+        self.assertDictEqual(prev_overwrite_dict, new_overwrite_dict)
+
+    async def test_temp_not_added_to_notifier(self):
+        """Channel was not added to notifier if a duration was set for the silence."""
+        with mock.patch.object(self.cog, "_set_silence_overwrites", return_value=True):
+            await self.cog.silence.callback(self.cog, MockContext(), 15)
+            self.cog.notifier.add_channel.assert_not_called()
+
+    async def test_indefinite_added_to_notifier(self):
+        """Channel was added to notifier if a duration was not set for the silence."""
+        with mock.patch.object(self.cog, "_set_silence_overwrites", return_value=True):
+            await self.cog.silence.callback(self.cog, MockContext(), None)
+            self.cog.notifier.add_channel.assert_called_once()
+
+    async def test_silenced_not_added_to_notifier(self):
+        """Channel was not added to the notifier if it was already silenced."""
+        with mock.patch.object(self.cog, "_set_silence_overwrites", return_value=False):
+            await self.cog.silence.callback(self.cog, MockContext(), 15)
+            self.cog.notifier.add_channel.assert_not_called()
+
+    async def test_cached_previous_overwrites(self):
+        """Channel's previous overwrites were cached."""
+        overwrite_json = '{"send_messages": true, "add_reactions": false}'
+        await self.cog._set_silence_overwrites(self.channel)
+        self.cog.previous_overwrites.set.assert_called_once_with(self.channel.id, overwrite_json)
+
+    @autospec(silence, "datetime")
+    async def test_cached_unsilence_time(self, datetime_mock):
+        """The UTC POSIX timestamp for the unsilence was cached."""
+        now_timestamp = 100
+        duration = 15
+        timestamp = now_timestamp + duration * 60
+        datetime_mock.now.return_value = datetime.fromtimestamp(now_timestamp, tz=timezone.utc)
+
+        ctx = MockContext(channel=self.channel)
+        await self.cog.silence.callback(self.cog, ctx, duration)
+
+        self.cog.unsilence_timestamps.set.assert_awaited_once_with(ctx.channel.id, timestamp)
+        datetime_mock.now.assert_called_once_with(tz=timezone.utc)  # Ensure it's using an aware dt.
+
+    async def test_cached_indefinite_time(self):
+        """A value of -1 was cached for a permanent silence."""
+        ctx = MockContext(channel=self.channel)
+        await self.cog.silence.callback(self.cog, ctx, None)
+        self.cog.unsilence_timestamps.set.assert_awaited_once_with(ctx.channel.id, -1)
+
+    async def test_scheduled_task(self):
+        """An unsilence task was scheduled."""
+        ctx = MockContext(channel=self.channel, invoke=mock.MagicMock())
+
+        await self.cog.silence.callback(self.cog, ctx, 5)
+
+        args = (300, ctx.channel.id, ctx.invoke.return_value)
+        self.cog.scheduler.schedule_later.assert_called_once_with(*args)
+        ctx.invoke.assert_called_once_with(self.cog.unsilence)
+
+    async def test_permanent_not_scheduled(self):
+        """A task was not scheduled for a permanent silence."""
+        ctx = MockContext(channel=self.channel)
+        await self.cog.silence.callback(self.cog, ctx, None)
+        self.cog.scheduler.schedule_later.assert_not_called()
+
+
+@autospec(silence.Silence, "unsilence_timestamps", pass_mocks=False)
+class UnsilenceTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for the unsilence command and its related helper methods."""
+
+    @autospec(silence.Silence, "_reschedule", pass_mocks=False)
+    @autospec(silence, "Scheduler", "SilenceNotifier", pass_mocks=False)
+    def setUp(self) -> None:
+        self.bot = MockBot(get_channel=lambda _: MockTextChannel())
+        self.cog = silence.Silence(self.bot)
+        self.cog._init_task = asyncio.Future()
+        self.cog._init_task.set_result(None)
+
+        overwrites_cache = mock.create_autospec(self.cog.previous_overwrites, spec_set=True)
+        self.cog.previous_overwrites = overwrites_cache
+
+        asyncio.run(self.cog._async_init())  # Populate instance attributes.
+
+        self.cog.scheduler.__contains__.return_value = True
+        overwrites_cache.get.return_value = '{"send_messages": true, "add_reactions": false}'
+        self.channel = MockTextChannel()
+        self.overwrite = PermissionOverwrite(stream=True, send_messages=False, add_reactions=False)
+        self.channel.overwrites_for.return_value = self.overwrite
+
+    async def test_sent_correct_message(self):
+        """Appropriate failure/success message was sent by the command."""
+        unsilenced_overwrite = PermissionOverwrite(send_messages=True, add_reactions=True)
+        test_cases = (
+            (True, silence.MSG_UNSILENCE_SUCCESS, unsilenced_overwrite),
+            (False, silence.MSG_UNSILENCE_FAIL, unsilenced_overwrite),
+            (False, silence.MSG_UNSILENCE_MANUAL, self.overwrite),
+            (False, silence.MSG_UNSILENCE_MANUAL, PermissionOverwrite(send_messages=False)),
+            (False, silence.MSG_UNSILENCE_MANUAL, PermissionOverwrite(add_reactions=False)),
+        )
+        for was_unsilenced, message, overwrite in test_cases:
+            ctx = MockContext()
+            with self.subTest(was_unsilenced=was_unsilenced, message=message, overwrite=overwrite):
+                with mock.patch.object(self.cog, "_unsilence", return_value=was_unsilenced):
+                    ctx.channel.overwrites_for.return_value = overwrite
+                    await self.cog.unsilence.callback(self.cog, ctx)
+                    ctx.channel.send.assert_called_once_with(message)
+
+    async def test_skipped_already_unsilenced(self):
+        """Permissions were not set and `False` was returned for an already unsilenced channel."""
+        self.cog.scheduler.__contains__.return_value = False
+        self.cog.previous_overwrites.get.return_value = None
         channel = MockTextChannel()
-        with mock.patch.object(self.cog, "muted_channels") as muted_channels:
-            await self.cog._silence(channel, False, None)
-        muted_channels.add.assert_called_once_with(channel)
 
-    async def test_unsilence_private_for_false(self):
-        """Permissions are not set and `False` is returned in an unsilenced channel."""
-        channel = Mock()
         self.assertFalse(await self.cog._unsilence(channel))
         channel.set_permissions.assert_not_called()
 
-    @mock.patch.object(Silence, "notifier", create=True)
-    async def test_unsilence_private_unsilenced_channel(self, _):
-        """Channel had `send_message` permissions restored"""
-        perm_overwrite = MagicMock(send_messages=False)
-        channel = MockTextChannel(overwrites_for=Mock(return_value=perm_overwrite))
-        self.assertTrue(await self.cog._unsilence(channel))
-        channel.set_permissions.assert_called_once()
-        self.assertIsNone(channel.set_permissions.call_args.kwargs['send_messages'])
-
-    @mock.patch.object(Silence, "notifier", create=True)
-    async def test_unsilence_private_removed_notifier(self, notifier):
-        """Channel was removed from `notifier` on unsilence."""
-        perm_overwrite = MagicMock(send_messages=False)
-        channel = MockTextChannel(overwrites_for=Mock(return_value=perm_overwrite))
-        await self.cog._unsilence(channel)
-        notifier.remove_channel.assert_called_once_with(channel)
-
-    @mock.patch.object(Silence, "notifier", create=True)
-    async def test_unsilence_private_removed_muted_channel(self, _):
-        """Channel was removed from `muted_channels` on unsilence."""
-        perm_overwrite = MagicMock(send_messages=False)
-        channel = MockTextChannel(overwrites_for=Mock(return_value=perm_overwrite))
-        with mock.patch.object(self.cog, "muted_channels") as muted_channels:
-            await self.cog._unsilence(channel)
-        muted_channels.discard.assert_called_once_with(channel)
-
-    @mock.patch.object(Silence, "notifier", create=True)
-    async def test_unsilence_private_preserves_permissions(self, _):
-        """Previous permissions were preserved when channel was unsilenced."""
-        channel = MockTextChannel()
-        # Set up mock channel permission state.
-        mock_permissions = PermissionOverwrite(send_messages=False)
-        mock_permissions_dict = dict(mock_permissions)
-        channel.overwrites_for.return_value = mock_permissions
-        await self.cog._unsilence(channel)
-        new_permissions = channel.set_permissions.call_args.kwargs
-        # Remove 'send_messages' key because it got changed in the method.
-        del new_permissions['send_messages']
-        del mock_permissions_dict['send_messages']
-        self.assertDictEqual(mock_permissions_dict, new_permissions)
-
-    @mock.patch("bot.exts.moderation.silence.asyncio")
-    @mock.patch.object(Silence, "_mod_alerts_channel", create=True)
-    def test_cog_unload_starts_task(self, alert_channel, asyncio_mock):
-        """Task for sending an alert was created with present `muted_channels`."""
-        with mock.patch.object(self.cog, "muted_channels"):
-            self.cog.cog_unload()
-            alert_channel.send.assert_called_once_with(f"<@&{Roles.moderators}> channels left silenced on cog unload: ")
-            asyncio_mock.create_task.assert_called_once_with(alert_channel.send())
-
-    @mock.patch("bot.exts.moderation.silence.asyncio")
-    def test_cog_unload_skips_task_start(self, asyncio_mock):
-        """No task created with no channels."""
-        self.cog.cog_unload()
-        asyncio_mock.create_task.assert_not_called()
+    async def test_restored_overwrites(self):
+        """Channel's `send_message` and `add_reactions` overwrites were restored."""
+        await self.cog._unsilence(self.channel)
+        self.channel.set_permissions.assert_awaited_once_with(
+            self.cog._verified_role,
+            overwrite=self.overwrite,
+        )
 
-    @mock.patch("discord.ext.commands.has_any_role")
-    @mock.patch("bot.exts.moderation.silence.MODERATION_ROLES", new=(1, 2, 3))
-    async def test_cog_check(self, role_check):
-        """Role check is called with `MODERATION_ROLES`"""
-        role_check.return_value.predicate = mock.AsyncMock()
-        await self.cog.cog_check(self.ctx)
-        role_check.assert_called_once_with(*(1, 2, 3))
-        role_check.return_value.predicate.assert_awaited_once_with(self.ctx)
+        # Recall that these values are determined by the fixture.
+        self.assertTrue(self.overwrite.send_messages)
+        self.assertFalse(self.overwrite.add_reactions)
+
+    async def test_cache_miss_used_default_overwrites(self):
+        """Both overwrites were set to None due previous values not being found in the cache."""
+        self.cog.previous_overwrites.get.return_value = None
+
+        await self.cog._unsilence(self.channel)
+        self.channel.set_permissions.assert_awaited_once_with(
+            self.cog._verified_role,
+            overwrite=self.overwrite,
+        )
+
+        self.assertIsNone(self.overwrite.send_messages)
+        self.assertIsNone(self.overwrite.add_reactions)
+
+    async def test_cache_miss_sent_mod_alert(self):
+        """A message was sent to the mod alerts channel."""
+        self.cog.previous_overwrites.get.return_value = None
+
+        await self.cog._unsilence(self.channel)
+        self.cog._mod_alerts_channel.send.assert_awaited_once()
+
+    async def test_removed_notifier(self):
+        """Channel was removed from `notifier`."""
+        await self.cog._unsilence(self.channel)
+        self.cog.notifier.remove_channel.assert_called_once_with(self.channel)
+
+    async def test_deleted_cached_overwrite(self):
+        """Channel was deleted from the overwrites cache."""
+        await self.cog._unsilence(self.channel)
+        self.cog.previous_overwrites.delete.assert_awaited_once_with(self.channel.id)
+
+    async def test_deleted_cached_time(self):
+        """Channel was deleted from the timestamp cache."""
+        await self.cog._unsilence(self.channel)
+        self.cog.unsilence_timestamps.delete.assert_awaited_once_with(self.channel.id)
+
+    async def test_cancelled_task(self):
+        """The scheduled unsilence task should be cancelled."""
+        await self.cog._unsilence(self.channel)
+        self.cog.scheduler.cancel.assert_called_once_with(self.channel.id)
+
+    async def test_preserved_other_overwrites(self):
+        """Channel's other unrelated overwrites were not changed, including cache misses."""
+        for overwrite_json in ('{"send_messages": true, "add_reactions": null}', None):
+            with self.subTest(overwrite_json=overwrite_json):
+                self.cog.previous_overwrites.get.return_value = overwrite_json
+
+                prev_overwrite_dict = dict(self.overwrite)
+                await self.cog._unsilence(self.channel)
+                new_overwrite_dict = dict(self.overwrite)
+
+                # Remove these keys because they were modified by the unsilence.
+                del prev_overwrite_dict['send_messages']
+                del prev_overwrite_dict['add_reactions']
+                del new_overwrite_dict['send_messages']
+                del new_overwrite_dict['add_reactions']
+
+                self.assertDictEqual(prev_overwrite_dict, new_overwrite_dict)
diff --git a/tests/bot/exts/utils/test_snekbox.py b/tests/bot/exts/utils/test_snekbox.py
index 40b2202aa..321a92445 100644
--- a/tests/bot/exts/utils/test_snekbox.py
+++ b/tests/bot/exts/utils/test_snekbox.py
@@ -42,9 +42,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
     async def test_upload_output(self, mock_paste_util):
         """Upload the eval output to the URLs.paste_service.format(key="documents") endpoint."""
         await self.cog.upload_output("Test output.")
-        mock_paste_util.assert_called_once_with(
-            self.bot.http_session, "Test output.", extension="txt"
-        )
+        mock_paste_util.assert_called_once_with("Test output.", extension="txt")
 
     def test_prepare_input(self):
         cases = (
@@ -52,6 +50,13 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
             ('`print("Hello world!")`', 'print("Hello world!")', 'one line code block'),
             ('```\nprint("Hello world!")```', 'print("Hello world!")', 'multiline code block'),
             ('```py\nprint("Hello world!")```', 'print("Hello world!")', 'multiline python code block'),
+            ('text```print("Hello world!")```text', 'print("Hello world!")', 'code block surrounded by text'),
+            ('```print("Hello world!")```\ntext\n```py\nprint("Hello world!")```',
+             'print("Hello world!")\nprint("Hello world!")', 'two code blocks with text in-between'),
+            ('`print("Hello world!")`\ntext\n```print("How\'s it going?")```',
+             'print("How\'s it going?")', 'code block preceded by inline code'),
+            ('`print("Hello world!")`\ntext\n`print("Hello world!")`',
+             'print("Hello world!")', 'one inline code block of two')
         )
         for case, expected, testname in cases:
             with self.subTest(msg=f'Extract code from {testname}.'):
@@ -154,7 +159,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
         self.cog.send_eval = AsyncMock(return_value=response)
         self.cog.continue_eval = AsyncMock(return_value=None)
 
-        await self.cog.eval_command.callback(self.cog, ctx=ctx, code='MyAwesomeCode')
+        await self.cog.eval_command(self.cog, ctx=ctx, code='MyAwesomeCode')
         self.cog.prepare_input.assert_called_once_with('MyAwesomeCode')
         self.cog.send_eval.assert_called_once_with(ctx, 'MyAwesomeFormattedCode')
         self.cog.continue_eval.assert_called_once_with(ctx, response)
@@ -168,7 +173,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
         self.cog.continue_eval = AsyncMock()
         self.cog.continue_eval.side_effect = ('MyAwesomeCode-2', None)
 
-        await self.cog.eval_command.callback(self.cog, ctx=ctx, code='MyAwesomeCode')
+        await self.cog.eval_command(self.cog, ctx=ctx, code='MyAwesomeCode')
         self.cog.prepare_input.has_calls(call('MyAwesomeCode'), call('MyAwesomeCode-2'))
         self.cog.send_eval.assert_called_with(ctx, 'MyAwesomeFormattedCode')
         self.cog.continue_eval.assert_called_with(ctx, response)
@@ -180,7 +185,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
         ctx.author.mention = '@LemonLemonishBeard#0042'
         ctx.send = AsyncMock()
         self.cog.jobs = (42,)
-        await self.cog.eval_command.callback(self.cog, ctx=ctx, code='MyAwesomeCode')
+        await self.cog.eval_command(self.cog, ctx=ctx, code='MyAwesomeCode')
         ctx.send.assert_called_once_with(
             "@LemonLemonishBeard#0042 You've already got a job running - please wait for it to finish!"
         )
@@ -188,8 +193,8 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
     async def test_eval_command_call_help(self):
         """Test if the eval command call the help command if no code is provided."""
         ctx = MockContext(command="sentinel")
-        await self.cog.eval_command.callback(self.cog, ctx=ctx, code='')
-        ctx.send_help.assert_called_once_with("sentinel")
+        await self.cog.eval_command(self.cog, ctx=ctx, code='')
+        ctx.send_help.assert_called_once_with(ctx.command)
 
     async def test_send_eval(self):
         """Test the send_eval function."""
@@ -290,7 +295,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
             )
         )
         ctx.message.add_reaction.assert_called_once_with(snekbox.REEVAL_EMOJI)
-        ctx.message.clear_reactions.assert_called_once()
+        ctx.message.clear_reaction.assert_called_once_with(snekbox.REEVAL_EMOJI)
         response.delete.assert_called_once()
 
     async def test_continue_eval_does_not_continue(self):
@@ -299,7 +304,7 @@ class SnekboxTests(unittest.IsolatedAsyncioTestCase):
 
         actual = await self.cog.continue_eval(ctx, MockMessage())
         self.assertEqual(actual, None)
-        ctx.message.clear_reactions.assert_called_once()
+        ctx.message.clear_reaction.assert_called_once_with(snekbox.REEVAL_EMOJI)
 
     async def test_get_code(self):
         """Should return 1st arg (or None) if eval cmd in message, otherwise return full content."""
diff --git a/tests/bot/patches/__init__.py b/tests/bot/patches/__init__.py
deleted file mode 100644
index e69de29bb..000000000
--- a/tests/bot/patches/__init__.py
+++ /dev/null
diff --git a/tests/bot/rules/test_discord_emojis.py b/tests/bot/rules/test_discord_emojis.py
index 9a72723e2..66c2d9f92 100644
--- a/tests/bot/rules/test_discord_emojis.py
+++ b/tests/bot/rules/test_discord_emojis.py
@@ -5,11 +5,12 @@ from tests.bot.rules import DisallowedCase, RuleTest
 from tests.helpers import MockMessage
 
 discord_emoji = "<:abcd:1234>"  # Discord emojis follow the format <:name:id>
+unicode_emoji = "🧪"
 
 
-def make_msg(author: str, n_emojis: int) -> MockMessage:
+def make_msg(author: str, n_emojis: int, emoji: str = discord_emoji) -> MockMessage:
     """Build a MockMessage instance with content containing `n_emojis` arbitrary emojis."""
-    return MockMessage(author=author, content=discord_emoji * n_emojis)
+    return MockMessage(author=author, content=emoji * n_emojis)
 
 
 class DiscordEmojisRuleTests(RuleTest):
@@ -20,16 +21,22 @@ class DiscordEmojisRuleTests(RuleTest):
         self.config = {"max": 2, "interval": 10}
 
     async def test_allows_messages_within_limit(self):
-        """Cases with a total amount of discord emojis within limit."""
+        """Cases with a total amount of discord and unicode emojis within limit."""
         cases = (
             [make_msg("bob", 2)],
             [make_msg("alice", 1), make_msg("bob", 2), make_msg("alice", 1)],
+            [make_msg("bob", 2, unicode_emoji)],
+            [
+                make_msg("alice", 1, unicode_emoji),
+                make_msg("bob", 2, unicode_emoji),
+                make_msg("alice", 1, unicode_emoji)
+            ],
         )
 
         await self.run_allowed(cases)
 
     async def test_disallows_messages_beyond_limit(self):
-        """Cases with more than the allowed amount of discord emojis."""
+        """Cases with more than the allowed amount of discord and unicode emojis."""
         cases = (
             DisallowedCase(
                 [make_msg("bob", 3)],
@@ -41,6 +48,20 @@ class DiscordEmojisRuleTests(RuleTest):
                 ("alice",),
                 4,
             ),
+            DisallowedCase(
+                [make_msg("bob", 3, unicode_emoji)],
+                ("bob",),
+                3,
+            ),
+            DisallowedCase(
+                [
+                    make_msg("alice", 2, unicode_emoji),
+                    make_msg("bob", 2, unicode_emoji),
+                    make_msg("alice", 2, unicode_emoji)
+                ],
+                ("alice",),
+                4
+            )
         )
 
         await self.run_disallowed(cases)
diff --git a/tests/bot/utils/test_services.py b/tests/bot/utils/test_services.py
index 5e0855704..1b48f6560 100644
--- a/tests/bot/utils/test_services.py
+++ b/tests/bot/utils/test_services.py
@@ -5,11 +5,14 @@ from unittest.mock import AsyncMock, MagicMock, Mock, patch
 from aiohttp import ClientConnectorError
 
 from bot.utils.services import FAILED_REQUEST_ATTEMPTS, send_to_paste_service
+from tests.helpers import MockBot
 
 
 class PasteTests(unittest.IsolatedAsyncioTestCase):
     def setUp(self) -> None:
-        self.http_session = MagicMock()
+        patcher = patch("bot.instance", new=MockBot())
+        self.bot = patcher.start()
+        self.addCleanup(patcher.stop)
 
     @patch("bot.utils.services.URLs.paste_service", "https://paste_service.com/{key}")
     async def test_url_and_sent_contents(self):
@@ -17,10 +20,10 @@ class PasteTests(unittest.IsolatedAsyncioTestCase):
         response = MagicMock(
             json=AsyncMock(return_value={"key": ""})
         )
-        self.http_session.post().__aenter__.return_value = response
-        self.http_session.post.reset_mock()
-        await send_to_paste_service(self.http_session, "Content")
-        self.http_session.post.assert_called_once_with("https://paste_service.com/documents", data="Content")
+        self.bot.http_session.post.return_value.__aenter__.return_value = response
+        self.bot.http_session.post.reset_mock()
+        await send_to_paste_service("Content")
+        self.bot.http_session.post.assert_called_once_with("https://paste_service.com/documents", data="Content")
 
     @patch("bot.utils.services.URLs.paste_service", "https://paste_service.com/{key}")
     async def test_paste_returns_correct_url_on_success(self):
@@ -34,41 +37,41 @@ class PasteTests(unittest.IsolatedAsyncioTestCase):
         response = MagicMock(
             json=AsyncMock(return_value={"key": key})
         )
-        self.http_session.post().__aenter__.return_value = response
+        self.bot.http_session.post.return_value.__aenter__.return_value = response
 
         for expected_output, extension in test_cases:
             with self.subTest(msg=f"Send contents with extension {repr(extension)}"):
                 self.assertEqual(
-                    await send_to_paste_service(self.http_session, "", extension=extension),
+                    await send_to_paste_service("", extension=extension),
                     expected_output
                 )
 
     async def test_request_repeated_on_json_errors(self):
         """Json with error message and invalid json are handled as errors and requests repeated."""
         test_cases = ({"message": "error"}, {"unexpected_key": None}, {})
-        self.http_session.post().__aenter__.return_value = response = MagicMock()
-        self.http_session.post.reset_mock()
+        self.bot.http_session.post.return_value.__aenter__.return_value = response = MagicMock()
+        self.bot.http_session.post.reset_mock()
 
         for error_json in test_cases:
             with self.subTest(error_json=error_json):
                 response.json = AsyncMock(return_value=error_json)
-                result = await send_to_paste_service(self.http_session, "")
-                self.assertEqual(self.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
+                result = await send_to_paste_service("")
+                self.assertEqual(self.bot.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
                 self.assertIsNone(result)
 
-            self.http_session.post.reset_mock()
+            self.bot.http_session.post.reset_mock()
 
     async def test_request_repeated_on_connection_errors(self):
         """Requests are repeated in the case of connection errors."""
-        self.http_session.post = MagicMock(side_effect=ClientConnectorError(Mock(), Mock()))
-        result = await send_to_paste_service(self.http_session, "")
-        self.assertEqual(self.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
+        self.bot.http_session.post = MagicMock(side_effect=ClientConnectorError(Mock(), Mock()))
+        result = await send_to_paste_service("")
+        self.assertEqual(self.bot.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
         self.assertIsNone(result)
 
     async def test_general_error_handled_and_request_repeated(self):
         """All `Exception`s are handled, logged and request repeated."""
-        self.http_session.post = MagicMock(side_effect=Exception)
-        result = await send_to_paste_service(self.http_session, "")
-        self.assertEqual(self.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
+        self.bot.http_session.post = MagicMock(side_effect=Exception)
+        result = await send_to_paste_service("")
+        self.assertEqual(self.bot.http_session.post.call_count, FAILED_REQUEST_ATTEMPTS)
         self.assertLogs("bot.utils", logging.ERROR)
         self.assertIsNone(result)
diff --git a/tests/helpers.py b/tests/helpers.py
index d35012278..ea5e2822c 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -5,7 +5,7 @@ import itertools
 import logging
 import unittest.mock
 from asyncio import AbstractEventLoop
-from typing import Callable, Iterable, Optional
+from typing import Iterable, Optional
 
 import discord
 from aiohttp import ClientSession
@@ -14,6 +14,7 @@ from discord.ext.commands import Context
 from bot.api import APIClient
 from bot.async_stats import AsyncStatsClient
 from bot.bot import Bot
+from tests._autospec import autospec  # noqa: F401 other modules import it via this module
 
 
 for logger in logging.Logger.manager.loggerDict.values():
@@ -26,24 +27,6 @@ for logger in logging.Logger.manager.loggerDict.values():
     logger.setLevel(logging.CRITICAL)
 
 
-def autospec(target, *attributes: str, **kwargs) -> Callable:
-    """Patch multiple `attributes` of a `target` with autospecced mocks and `spec_set` as True."""
-    # Caller's kwargs should take priority and overwrite the defaults.
-    kwargs = {'spec_set': True, 'autospec': True, **kwargs}
-
-    # Import the target if it's a string.
-    # This is to support both object and string targets like patch.multiple.
-    if type(target) is str:
-        target = unittest.mock._importer(target)
-
-    def decorator(func):
-        for attribute in attributes:
-            patcher = unittest.mock.patch.object(target, attribute, **kwargs)
-            func = patcher(func)
-        return func
-    return decorator
-
-
 class HashableMixin(discord.mixins.EqualityComparable):
     """
     Mixin that provides similar hashing and equality functionality as discord.py's `Hashable` mixin.