add a test for type hint is subclass

tests/units/utils/test_utils.py

@@ -2,7 +2,7 @@ import os
 import typing
 from functools import cached_property
 from pathlib import Path
-from typing import Any, ClassVar, List, Literal, Type, Union
+from typing import Any, ClassVar, Dict, List, Literal, Type, Union
 
 import pytest
 import typer
@@ -77,6 +77,43 @@ def test_is_generic_alias(cls: type, expected: bool):
     assert types.is_generic_alias(cls) == expected
 
 
+@pytest.mark.parametrize(
+    ("subclass", "superclass", "expected"),
+    [
+        *[
+            (base_type, base_type, True)
+            for base_type in [int, float, str, bool, list, dict]
+        ],
+        *[
+            (one_type, another_type, False)
+            for one_type in [int, float, str, list, dict]
+            for another_type in [int, float, str, list, dict]
+            if one_type != another_type
+        ],
+        (bool, int, True),
+        (int, bool, False),
+        (list, List, True),
+        (list, List[str], True),  # this is wrong, but it's a limitation of the function
+        (List, list, True),
+        (List[int], list, True),
+        (List[int], List, True),
+        (List[int], List[str], False),
+        (List[int], List[int], True),
+        (List[int], List[float], False),
+        (List[int], List[Union[int, float]], True),
+        (List[int], List[Union[float, str]], False),
+        (Union[int, float], List[Union[int, float]], False),
+        (Union[int, float], Union[int, float, str], True),
+        (Union[int, float], Union[str, float], False),
+        (Dict[str, int], Dict[str, int], True),
+        (Dict[str, bool], Dict[str, int], True),
+        (Dict[str, int], Dict[str, bool], False),
+    ],
+)
+def test_typehint_issubclass(subclass, superclass, expected):
+    assert types.typehint_issubclass(subclass, superclass) == expected
+
+
 def test_validate_invalid_bun_path(mocker):
     """Test that an error is thrown when a custom specified bun path is not valid
     or does not exist.