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Test that nan value counts are included when dropna=False. GH#31944 #36783

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Merged
merged 3 commits into from
Oct 6, 2020
Merged

Test that nan value counts are included when dropna=False. GH#31944 #36783

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Test that nan value counts are included when dropna=False. GH#31944
icanhazcodeplz Oct 1, 2020
271c49a
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icanhazcodeplz Oct 2, 2020
1bdce41
Test when dropna is True as well
icanhazcodeplz Oct 2, 2020
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14 changes: 14 additions & 0 deletions pandas/tests/base/test_value_counts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -274,3 +274,17 @@ def test_value_counts_datetime64(index_or_series):
td2 = klass(td2, name="dt")
result2 = td2.value_counts()
tm.assert_series_equal(result2, expected_s)


@pytest.mark.parametrize("dropna", [True, False])
def test_value_counts_with_nan(dropna, index_or_series):
# GH31944
klass = index_or_series
values = [True, pd.NA, np.nan]
s = klass(values)
res = s.value_counts(dropna=dropna)
if dropna is True:
expected = Series([1], index=[True])
else:
expected = Series([2, 1], index=[pd.NA, True])
tm.assert_series_equal(res, expected)