GH203 Fix lint

Author: loicdiridollou

pandas-stubs/core/frame.pyi

@@ -1090,7 +1090,7 @@ class DataFrame(NDFrame, OpsMixin):
         dropna: _bool = ...,
     ) -> DataFrameGroupBy[Timestamp, Literal[True]]: ...
     @overload
-    def groupby(
+    def groupby(  # type: ignore[overload-overlap]
         self,
         by: DatetimeIndex,
         axis: AxisIndex | NoDefault = ...,

tests/test_frame.py

@@ -1043,27 +1043,6 @@ def test_types_groupby_as_index() -> None:
     )
 
 
-def test_types_groupby_as_index_timestamp() -> None:
-    """Test groupby size with DatetimeIndex."""
-    idx = pd.DatetimeIndex(["2023-10-01", "2023-10-02", "2023-10-01"], name="date")
-    sub_idx = pd.DatetimeIndex(["2023-10-01", "2023-10-02"], name="date")
-    df = pd.DataFrame({"a": [1, 2, 3]}, index=idx)
-    check(
-        assert_type(
-            df.groupby(sub_idx, as_index=False).size(),
-            pd.DataFrame,
-        ),
-        pd.DataFrame,
-    )
-    check(
-        assert_type(
-            df.groupby(sub_idx, as_index=True).size(),
-            "pd.Series[int]",
-        ),
-        pd.Series,
-    )
-
-
 def test_types_groupby_size() -> None:
     """Test for GH886."""
     data = [