61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
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"""
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Behavioral based tests for offsets and date_range.
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This file is adapted from https://github.com/pandas-dev/pandas/pull/18761 -
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which was more ambitious but less idiomatic in its use of Hypothesis.
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You may wish to consult the previous version for inspiration on further
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tests, or when trying to pin down the bugs exposed by the tests below.
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"""
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from hypothesis import (
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assume,
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given,
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)
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import pytest
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import pytz
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import pandas as pd
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from pandas._testing._hypothesis import (
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DATETIME_JAN_1_1900_OPTIONAL_TZ,
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YQM_OFFSET,
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)
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# ----------------------------------------------------------------
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# Offset-specific behaviour tests
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@pytest.mark.arm_slow
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@given(DATETIME_JAN_1_1900_OPTIONAL_TZ, YQM_OFFSET)
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def test_on_offset_implementations(dt, offset):
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assume(not offset.normalize)
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# check that the class-specific implementations of is_on_offset match
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# the general case definition:
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# (dt + offset) - offset == dt
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try:
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compare = (dt + offset) - offset
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except (pytz.NonExistentTimeError, pytz.AmbiguousTimeError):
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# When dt + offset does not exist or is DST-ambiguous, assume(False) to
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# indicate to hypothesis that this is not a valid test case
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# DST-ambiguous example (GH41906):
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# dt = datetime.datetime(1900, 1, 1, tzinfo=pytz.timezone('Africa/Kinshasa'))
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# offset = MonthBegin(66)
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assume(False)
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assert offset.is_on_offset(dt) == (compare == dt)
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@given(YQM_OFFSET)
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def test_shift_across_dst(offset):
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# GH#18319 check that 1) timezone is correctly normalized and
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# 2) that hour is not incorrectly changed by this normalization
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assume(not offset.normalize)
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# Note that dti includes a transition across DST boundary
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dti = pd.date_range(
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start="2017-10-30 12:00:00", end="2017-11-06", freq="D", tz="US/Eastern"
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)
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assert (dti.hour == 12).all() # we haven't screwed up yet
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res = dti + offset
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assert (res.hour == 12).all()
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