EH Tests: Created test cases set + already handled error test

Created test that make sure when error is already handled in local error
handler, this don't await `ctx.send` to make sure that this don't move
forward.

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/bot/cogs/test_error_handler.py b/tests/bot/cogs/test_error_handler.py
new file mode 100644
index 000000000..6aca03030
--- /dev/null
+++ b/tests/bot/cogs/test_error_handler.py
@@ -0,0 +1,22 @@
+import unittest
+
+from discord.ext.commands import errors
+
+from bot.cogs.error_handler import ErrorHandler
+from tests.helpers import MockBot, MockContext
+
+
+class ErrorHandlerTests(unittest.IsolatedAsyncioTestCase):
+    """Tests for error handler functionality."""
+
+    def setUp(self):
+        self.bot = MockBot()
+        self.ctx = MockContext(bot=self.bot)
+        self.cog = ErrorHandler(self.bot)
+
+    async def test_error_handler_already_handled(self):
+        """Should not do anything when error is already handled by local error handler."""
+        error = errors.CommandError()
+        error.handled = "foo"
+        await self.cog.on_command_error(self.ctx, error)
+        self.ctx.send.assert_not_awaited()