Fix linting issue

Author: martinmoldrup

snappylapy/fixtures.py

@@ -215,6 +215,7 @@ def read_test_results(self) -> bytes:
 
     @overload
     def __call__(self, data_to_snapshot: dict, name: str | None = None, filetype: str | None = None) -> DictExpect: ...
+
     @overload
     def __call__(
         self,
@@ -236,7 +237,10 @@ def __call__(
 
     @overload
     def __call__(
-        self, data_to_snapshot: DataframeExpect.DataFrame, name: str | None = None, filetype: str | None = None,
+        self,
+        data_to_snapshot: DataframeExpect.DataFrame,
+        name: str | None = None,
+        filetype: str | None = None,
     ) -> DataframeExpect: ...
 
     def __call__(
@@ -261,13 +265,14 @@ def __call__(
         }
 
         for typ, func in type_map.items():
-            if isinstance(data_to_snapshot, typ):
+            if isinstance(typ, type) and isinstance(data_to_snapshot, typ):
                 return func(data_to_snapshot, **kwargs)
 
-        error_message = f"Unsupported type {type(data_to_snapshot)}. Expected one of: dict, list, str, bytes, DataFrame."
-        raise TypeError(
-            error_message,
-        )
+        supported_types: list[str] = [
+            getattr(typ, "__name__", str(typ)) if isinstance(typ, type) else typ for typ in type_map.keys()  # noqa: SIM118
+        ]
+        error_message = f"Unsupported type: {type(data_to_snapshot)}. Supported types: {', '.join(supported_types)}."
+        raise TypeError(error_message)
 
 
 class LoadSnapshot:
@@ -312,5 +317,5 @@ def dataframe(self) -> DataframeExpect.DataFrame:
         """Load dataframe snapshot."""
         self.settings.depending_filename_extension = "dataframe.json"
         return DataframeExpect.DataFrame(
-            JsonPickleSerializer[DataframeExpect.DataFrame]().deserialize(self._read_snapshot())
+            JsonPickleSerializer[DataframeExpect.DataFrame]().deserialize(self._read_snapshot()),
         )

tests/test_snappylappy_new.py

@@ -7,6 +7,15 @@ def test_snapshot_string(expect: Expect):
     """Test snapshot with string data."""
     expect.string("Hello World").to_match_snapshot()
 
+def test_unsupported_type(expect: Expect):
+    """Test snapshot with unsupported type."""
+    class Unsupported:
+        """An unsupported type for snapshot."""
+        pass
+
+    with pytest.raises(TypeError):
+        expect(Unsupported())
+
 def test_snapshot_bytes(expect: Expect):
     """Test snapshot with bytes data."""
     expect.bytes(b"Hello World", name="bytes_snapshot").to_match_snapshot()