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TST: Test resampling with NaT #13164

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26 changes: 26 additions & 0 deletions pandas/tseries/tests/test_resample.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1846,6 +1846,32 @@ def test_resmaple_dst_anchor(self):
freq='D', tz='Europe/Paris')),
'D Frequency')

def test_resample_with_nat(self):
# GH 13020
index = DatetimeIndex([pd.NaT,
'1970-01-01 00:00:00',
pd.NaT,
'1970-01-01 00:00:01',
'1970-01-01 00:00:02'])
frame = DataFrame([2, 3, 5, 7, 11], index=index)

index_1s = DatetimeIndex(['1970-01-01 00:00:00',
'1970-01-01 00:00:01',
'1970-01-01 00:00:02'])
frame_1s = DataFrame([3, 7, 11], index=index_1s)
assert_frame_equal(frame.resample('1s').mean(), frame_1s)

index_2s = DatetimeIndex(['1970-01-01 00:00:00',
'1970-01-01 00:00:02'])
frame_2s = DataFrame([5, 11], index=index_2s)
assert_frame_equal(frame.resample('2s').mean(), frame_2s)

index_3s = DatetimeIndex(['1970-01-01 00:00:00'])
frame_3s = DataFrame([7], index=index_3s)
assert_frame_equal(frame.resample('3s').mean(), frame_3s)

assert_frame_equal(frame.resample('60s').mean(), frame_3s)


class TestPeriodIndex(Base, tm.TestCase):
_multiprocess_can_split_ = True
Expand Down