diff --git a/tests/unit/core/python/arguments/test_PythonFunctionArgument.py b/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
index b242fd3..4439576 100644
--- a/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
+++ b/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
@@ -133,4 +133,25 @@ def test_PythonFunctionArgument(name, kind, default, annotation):
     '_',
 ])
 def test_PythonFunctionArgument_asterik(name, kind, annotation):
-    PythonFunctionArgument(name, kind, None, annotation)
\ No newline at end of file
+    PythonFunctionArgument(name, kind, None, annotation)
+
+@pytest.mark.parametrize('argument,expected', [
+    (PythonFunctionArgument('a', PythonArgumentKind.NORMAL, None, None), 'a'),
+    (PythonFunctionArgument('a', PythonArgumentKind.NORMAL, '1', None), 'a = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.NORMAL, None, 'int'), 'a: int'),
+    (PythonFunctionArgument('a', PythonArgumentKind.NORMAL, '1', 'int'), 'a: int = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.POSITIONAL_ONLY, None, None), 'a'),
+    (PythonFunctionArgument('a', PythonArgumentKind.POSITIONAL_ONLY, '1', None), 'a = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.POSITIONAL_ONLY, None, 'int'), 'a: int'),
+    (PythonFunctionArgument('a', PythonArgumentKind.POSITIONAL_ONLY, '1', 'int'), 'a: int = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KEYWORD_ONLY, None, None), 'a'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KEYWORD_ONLY, '1', None), 'a = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KEYWORD_ONLY, None, 'int'), 'a: int'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KEYWORD_ONLY, '1', 'int'), 'a: int = 1'),
+    (PythonFunctionArgument('a', PythonArgumentKind.VARARG, None, None), '*a'),
+    (PythonFunctionArgument('a', PythonArgumentKind.VARARG, None, 'int'), '*a: int'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KWARGS, None, None), '**a'),
+    (PythonFunctionArgument('a', PythonArgumentKind.KWARGS, None, 'int'), '**a: int'),
+])
+def test_PythonFunctionArgument_signature_repr(argument, expected):
+    assert argument.signature_repr() == expected
\ No newline at end of file