Deprecate categorical datetime coercion test

Author: arthurlw

pandas/tests/io/parser/dtypes/test_categorical.py

@@ -271,18 +271,6 @@ def test_categorical_coerces_numeric(all_parsers):
     tm.assert_frame_equal(result, expected)
 
 
-def test_categorical_coerces_datetime(all_parsers):
-    parser = all_parsers
-    dti = pd.DatetimeIndex(["2017-01-01", "2018-01-01", "2019-01-01"], freq=None)
-    dtype = {"b": CategoricalDtype(dti)}
-
-    data = "b\n2017-01-01\n2018-01-01\n2019-01-01"
-    expected = DataFrame({"b": Categorical(dtype["b"].categories)})
-
-    result = parser.read_csv(StringIO(data), dtype=dtype)
-    tm.assert_frame_equal(result, expected)
-
-
 def test_categorical_coerces_timestamp(all_parsers):
     parser = all_parsers
     dtype = {"b": CategoricalDtype([Timestamp("2014")])}