Revert "Added test for github issue pandas-dev#33830 to test that cat…

…egorical was preserving DateTimeIndex freq attribute"

This reverts commit e4b8cbf.

pandas/tests/indexes/datetimes/test_constructors.py

@@ -8,7 +8,6 @@
 
 import dateutil
 import numpy as np
-from pandas._testing.asserters import assert_equal
 import pytest
 import pytz
 
@@ -85,16 +84,6 @@ def test_categorical_preserves_tz(self):
                 result = DatetimeIndex(obj)
                 tm.assert_index_equal(result, dti)
 
-    def test_categorical_preserves_freq(self):
-        # GH33830 freq retention in categorical
-        dti = pd.date_range('2016-01-01', periods=5)
-        expected = dti.freq
-
-        cat = pd.Categorical(dti)
-        result = cat.categories.freq
-
-        assert expected == result
-
     def test_dti_with_period_data_raises(self):
         # GH#23675
         data = pd.PeriodIndex(["2016Q1", "2016Q2"], freq="Q")