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11 changes: 6 additions & 5 deletions xarray/tests/test_coding_times.py
Original file line number Diff line number Diff line change
Expand Up @@ -538,20 +538,21 @@ def test_infer_datetime_units(freq, units) -> None:


@pytest.mark.parametrize(
["dates", "expected"],
["date_strings", "expected"],
[
(
pd.to_datetime(["1900-01-01", "1900-01-02", "NaT"], unit="ns"),
["1900-01-01", "1900-01-02", "NaT"],
"days since 1900-01-01 00:00:00",
),
(
pd.to_datetime(["NaT", "1900-01-01"], unit="ns"),
["NaT", "1900-01-01"],
"days since 1900-01-01 00:00:00",
),
(pd.to_datetime(["NaT"], unit="ns"), "days since 1970-01-01 00:00:00"),
(["NaT"], "days since 1970-01-01 00:00:00"),
],
)
def test_infer_datetime_units_with_NaT(dates, expected) -> None:
def test_infer_datetime_units_with_NaT(date_strings, expected) -> None:
dates = pd.to_datetime(date_strings, unit="ns")
assert expected == infer_datetime_units(dates)


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