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Testing to_datetime, converting none to NaT #43006

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Testing to_datetime, converting none to NaT #43006

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f67ffe3
Testing to_datetime, converting none to NaT
Aug 12, 2021
908c202
Testing to_datetime, converting NA/NaN to NaT
Aug 12, 2021
bfbfb62
Fix linting issues - move test near other related ones.
Aug 20, 2021
ab1851b
Fix CI error: function uses no argument 'cache'
Aug 20, 2021
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19 changes: 19 additions & 0 deletions pandas/tests/tools/test_to_datetime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -992,6 +992,25 @@ def test_convert_object_to_datetime_with_cache(
)
tm.assert_series_equal(result_series, expected_series)

@pytest.mark.parametrize("cache", [True, False])
@pytest.mark.parametrize(
("input", "expected"),
(
(
Series([NaT] * 200 + [None] * 200, dtype="object"),
Series([NaT] * 400, dtype="datetime64[ns]"),
),
(Series([None] * 200), Series([NaT] * 200, dtype="datetime64[ns]")),
(Series([""] * 200), Series([NaT] * 200, dtype="datetime64[ns]")),
(Series([pd.NA] * 200), Series([NaT] * 200, dtype="datetime64[ns]")),
(Series([np.NaN] * 200), Series([NaT] * 200, dtype="datetime64[ns]")),
),
)
def test_to_datetime_converts_null_like_to_nat(self, cache, input, expected):
# GH35888
result = to_datetime(input, cache=cache)
tm.assert_series_equal(result, expected)

@pytest.mark.parametrize(
"date, format",
[
Expand Down