2 files changed, 59 insertions, 0 deletions
diff --git a/tests/bot/exts/info/doc/__init__.py b/tests/bot/exts/info/doc/__init__.py
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/tests/bot/exts/info/doc/__init__.py
diff --git a/tests/bot/exts/info/doc/test_parsing.py b/tests/bot/exts/info/doc/test_parsing.py
new file mode 100644
index 000000000..f302b38fc
--- /dev/null
+++ b/tests/bot/exts/info/doc/test_parsing.py
@@ -0,0 +1,59 @@
+from unittest import TestCase
+
+from bot.exts.info.doc import _parsing as parsing
+
+
+class SignatureSplitter(TestCase):
+
+    def test_basic_split(self):
+        test_cases = (
+            ("0,0,0", ["0", "0", "0"]),
+            ("0,a=0,a=0", ["0", "a=0", "a=0"]),
+        )
+        self._run_tests(test_cases)
+
+    def test_commas_ignored_in_brackets(self):
+        test_cases = (
+            ("0,[0,0],0,[0,0],0", ["0", "[0,0]", "0", "[0,0]", "0"]),
+            ("(0,),0,(0,(0,),0),0", ["(0,)", "0", "(0,(0,),0)", "0"]),
+        )
+        self._run_tests(test_cases)
+
+    def test_mixed_brackets(self):
+        tests_cases = (
+            ("[0,{0},0],0,{0:0},0", ["[0,{0},0]", "0", "{0:0}", "0"]),
+            ("([0],0,0),0,(0,0),0", ["([0],0,0)", "0", "(0,0)", "0"]),
+            ("([(0,),(0,)],0),0", ["([(0,),(0,)],0)", "0"]),
+        )
+        self._run_tests(tests_cases)
+
+    def test_string_contents_ignored(self):
+        test_cases = (
+            ("'0,0',0,',',0", ["'0,0'", "0", "','", "0"]),
+            ("0,[']',0],0", ["0", "[']',0]", "0"]),
+            ("{0,0,'}}',0,'{'},0", ["{0,0,'}}',0,'{'}", "0"]),
+        )
+        self._run_tests(test_cases)
+
+    def test_mixed_quotes(self):
+        test_cases = (
+            ("\"0',0',\",'0,0',0", ["\"0',0',\"", "'0,0'", "0"]),
+            ("\",',\",'\",',0", ["\",',\"", "'\",'", "0"]),
+        )
+        self._run_tests(test_cases)
+
+    def test_real_signatures(self):
+        test_cases = (
+            ("start, stop[, step]", ["start", " stop[, step]"]),
+            ("object=b'', encoding='utf-8', errors='strict'", ["object=b''", " encoding='utf-8'", " errors='strict'"]),
+            (
+                "typename, field_names, *, rename=False, defaults=None, module=None",
+                ["typename", " field_names", " *", " rename=False", " defaults=None", " module=None"]
+            ),
+        )
+        self._run_tests(test_cases)
+
+    def _run_tests(self, test_cases):
+        for input_string, expected_output in test_cases:
+            with self.subTest(input_string=input_string):
+                self.assertEqual(list(parsing._split_parameters(input_string)), expected_output)