Remove redundant tests

Author: undermyumbrella1

pandas/tests/extension/test_arrow.py

@@ -1125,27 +1125,6 @@ def test_comp_masked_numpy(self, masked_dtype, comparison_op):
         expected = pd.Series(exp, dtype=ArrowDtype(pa.bool_()))
         tm.assert_series_equal(result, expected)
 
-    def test_groupby_agg_extension(self, data_for_grouping):
-        # GH#38980 groupby agg on extension type fails for non-numeric types
-        df = pd.DataFrame({"A": [1, 1, 2, 2, 3, 3, 1, 4], "B": data_for_grouping})
-
-        expected_df = pd.DataFrame(
-            {"A": [1, 1, 2, 2, 3, 3, 1, 4], "B": data_for_grouping}
-        )
-        expected = expected_df.iloc[[0, 2, 4, 7]]
-        expected = expected.set_index("A")
-        expected_dtype = expected["B"].dtype
-        expected["B"] = expected["B"].astype(expected_dtype)
-
-        result = df.groupby("A").agg({"B": "first"})
-        tm.assert_frame_equal(result, expected)
-
-        result = df.groupby("A").agg("first")
-        tm.assert_frame_equal(result, expected)
-
-        result = df.groupby("A").first()
-        tm.assert_frame_equal(result, expected)
-
 
 class TestLogicalOps:
     """Various Series and DataFrame logical ops methods."""