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Oct 27, 2016
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TST: simplify tests for GH14346 #14502

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119 changes: 48 additions & 71 deletions pandas/tests/indexes/test_datetimelike.py
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Original file line number Diff line number Diff line change
Expand Up @@ -732,30 +732,21 @@ def test_fillna_datetime64(self):
dtype=object)
self.assert_index_equal(idx.fillna('x'), exp)

def test_difference_of_union(self):
# GH14323: Test taking the union of differences of an Index.
# Difference of DatetimeIndex does not preserve frequency,
# so a differencing operation should not retain the freq field of the
# original index.
i = pd.date_range("20160920", "20160925", freq="D")

a = pd.date_range("20160921", "20160924", freq="D")
expected = pd.DatetimeIndex(["20160920", "20160925"], freq=None)
a_diff = i.difference(a)
tm.assert_index_equal(a_diff, expected)
tm.assert_attr_equal('freq', a_diff, expected)

b = pd.date_range("20160922", "20160925", freq="D")
b_diff = i.difference(b)
expected = pd.DatetimeIndex(["20160920", "20160921"], freq=None)
tm.assert_index_equal(b_diff, expected)
tm.assert_attr_equal('freq', b_diff, expected)

union_of_diff = a_diff.union(b_diff)
expected = pd.DatetimeIndex(["20160920", "20160921", "20160925"],
freq=None)
tm.assert_index_equal(union_of_diff, expected)
tm.assert_attr_equal('freq', union_of_diff, expected)
def test_difference_freq(self):
# GH14323: difference of DatetimeIndex should not preserve frequency

index = date_range("20160920", "20160925", freq="D")
other = date_range("20160921", "20160924", freq="D")
expected = DatetimeIndex(["20160920", "20160925"], freq=None)
idx_diff = index.difference(other)
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)

other = date_range("20160922", "20160925", freq="D")
idx_diff = index.difference(other)
expected = DatetimeIndex(["20160920", "20160921"], freq=None)
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)


class TestPeriodIndex(DatetimeLike, tm.TestCase):
Expand Down Expand Up @@ -963,29 +954,23 @@ def test_no_millisecond_field(self):
with self.assertRaises(AttributeError):
DatetimeIndex([]).millisecond

def test_difference_of_union(self):
# GH14323: Test taking the union of differences of an Index.
# Difference of Period MUST preserve frequency, but the ability
# to union results must be preserved
i = pd.period_range("20160920", "20160925", freq="D")

a = pd.period_range("20160921", "20160924", freq="D")
expected = pd.PeriodIndex(["20160920", "20160925"], freq='D')
a_diff = i.difference(a)
tm.assert_index_equal(a_diff, expected)
tm.assert_attr_equal('freq', a_diff, expected)

b = pd.period_range("20160922", "20160925", freq="D")
b_diff = i.difference(b)
expected = pd.PeriodIndex(["20160920", "20160921"], freq='D')
tm.assert_index_equal(b_diff, expected)
tm.assert_attr_equal('freq', b_diff, expected)

union_of_diff = a_diff.union(b_diff)
expected = pd.PeriodIndex(["20160920", "20160921", "20160925"],
freq='D')
tm.assert_index_equal(union_of_diff, expected)
tm.assert_attr_equal('freq', union_of_diff, expected)
def test_difference_freq(self):
# GH14323: difference of Period MUST preserve frequency
# but the ability to union results must be preserved

index = period_range("20160920", "20160925", freq="D")

other = period_range("20160921", "20160924", freq="D")
expected = PeriodIndex(["20160920", "20160925"], freq='D')
idx_diff = index.difference(other)
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)

other = period_range("20160922", "20160925", freq="D")
idx_diff = index.difference(other)
expected = PeriodIndex(["20160920", "20160921"], freq='D')
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)


class TestTimedeltaIndex(DatetimeLike, tm.TestCase):
Expand Down Expand Up @@ -1199,27 +1184,19 @@ def test_fillna_timedelta(self):
[pd.Timedelta('1 day'), 'x', pd.Timedelta('3 day')], dtype=object)
self.assert_index_equal(idx.fillna('x'), exp)

def test_difference_of_union(self):
# GH14323: Test taking the union of differences of an Index.
# Difference of TimedeltaIndex does not preserve frequency,
# so a differencing operation should not retain the freq field of the
# original index.
i = pd.timedelta_range("0 days", "5 days", freq="D")

a = pd.timedelta_range("1 days", "4 days", freq="D")
expected = pd.TimedeltaIndex(["0 days", "5 days"], freq=None)
a_diff = i.difference(a)
tm.assert_index_equal(a_diff, expected)
tm.assert_attr_equal('freq', a_diff, expected)

b = pd.timedelta_range("2 days", "5 days", freq="D")
b_diff = i.difference(b)
expected = pd.TimedeltaIndex(["0 days", "1 days"], freq=None)
tm.assert_index_equal(b_diff, expected)
tm.assert_attr_equal('freq', b_diff, expected)

union_of_difference = a_diff.union(b_diff)
expected = pd.TimedeltaIndex(["0 days", "1 days", "5 days"],
freq=None)
tm.assert_index_equal(union_of_difference, expected)
tm.assert_attr_equal('freq', union_of_difference, expected)
def test_difference_freq(self):
# GH14323: Difference of TimedeltaIndex should not preserve frequency

index = timedelta_range("0 days", "5 days", freq="D")

other = timedelta_range("1 days", "4 days", freq="D")
expected = TimedeltaIndex(["0 days", "5 days"], freq=None)
idx_diff = index.difference(other)
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)

other = timedelta_range("2 days", "5 days", freq="D")
idx_diff = index.difference(other)
expected = TimedeltaIndex(["0 days", "1 days"], freq=None)
tm.assert_index_equal(idx_diff, expected)
tm.assert_attr_equal('freq', idx_diff, expected)