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TST: Added test for frequency retention in categorical constructor #46779

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Merged
merged 5 commits into from
Apr 18, 2022
Merged

TST: Added test for frequency retention in categorical constructor #46779

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e4b8cbf
Added test for github issue #33830 to test that categorical was prese…
andjhall Apr 5, 2022
32f394d
Added an additional test for value_counts preserving frequency
andjhall Apr 5, 2022
507c736
Modified tests in test_constructors.py to pass the pre-commit check
andjhall Apr 7, 2022
57e8535
Removed tests from test_constructors that were not needed
andjhall Apr 11, 2022
7925675
Moved categorical freq retention test to pandas/tests/arrays/categori…
bgollop Apr 18, 2022
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12 changes: 12 additions & 0 deletions pandas/tests/indexes/datetimes/test_constructors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
to_datetime,
)
import pandas._testing as tm
from pandas._testing.asserters import assert_equal
from pandas.core.arrays import (
DatetimeArray,
period_array,
Expand Down Expand Up @@ -84,6 +85,17 @@ 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 = date_range("2016-01-01", periods=5)

expected = dti.freq

cat = pd.Categorical(dti)
result = cat.categories.freq

assert_equal(expected, result)

def test_dti_with_period_data_raises(self):
# GH#23675
data = pd.PeriodIndex(["2016Q1", "2016Q2"], freq="Q")
Expand Down