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TST: add a test with freq=1MS to increase coverage of shift #54211

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Jul 21, 2023
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TST: add a test with freq=1MS to increase coverage of shift #54211

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9 changes: 9 additions & 0 deletions pandas/tests/frame/methods/test_shift.py
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Original file line number Diff line number Diff line change
Expand Up @@ -656,3 +656,12 @@ def test_shift_axis1_many_periods(self):

shifted2 = df.shift(-6, axis=1, fill_value=None)
tm.assert_frame_equal(shifted2, expected)

def test_shift_with_offsets_freq(self):
df = DataFrame({"x": [1, 2, 3]}, index=date_range("2000", periods=3))
shifted = df.shift(freq="1MS")
expected = DataFrame(
{"x": [1, 2, 3]},
index=date_range(start="02/01/2000", end="02/01/2000", periods=3),
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this is fine here, but in the future, I'd suggest using 2000-02-01 format, it's less ambiguous, whereas 02/01/2000 means different things in different parts of the world

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Thank you, I will use 2000-02-01 format.

)
tm.assert_frame_equal(shifted, expected)