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TST: series offset artithmetic tests #34582

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28ae2ae
TST: Added tests to check the arithmetic behaviour of adding and subt…
Jun 4, 2020
b9b04e6
TST: Run isort for test_arithmetic.py
Jun 4, 2020
5f8aaed
TST: Reworked tests for GH#19211 after review and added several tests…
Jun 6, 2020
aace93c
TST: Reworked tests for GH#19211 after review. Replaced warnings.simp…
Jun 6, 2020
6c81b5b
TST: Restored accidentally deleted blank line
Jun 6, 2020
f40b143
TST: Parametrized tests to avoid code duplication.
Jun 7, 2020
d4fd4e6
TST: Moved tests to pandas/tests/arithmetic/test_datetime64.py and re…
Jun 7, 2020
09e6ba1
TST: Grouped dependent input/output parameters at @parametrize.
Jun 8, 2020
1519abb
TST: Adapted test test_dti_addsub_offset_arraylike. Changed index_or_…
Jun 10, 2020
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193 changes: 193 additions & 0 deletions pandas/tests/series/test_arithmetic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -679,6 +679,199 @@ def test_series_add_aware_naive_raises(self):
with pytest.raises(Exception, match=msg):
ser_utc + ser

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_add_daytime_offset(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-02-01"),
pd.Timestamp("2000-05-01"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthEnd(),
]
)

result1 = ser_offset + ser_daytime
result2 = ser_daytime + ser_offset

expected = pd.Series(
[
pd.Timestamp("2001-01-01"),
pd.Timestamp("2000-04-01"),
pd.Timestamp("2000-05-31"),
]
)

tm.assert_series_equal(result1, expected)
tm.assert_series_equal(result2, expected)

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_add_daytime_offset_index(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-02-01"),
pd.Timestamp("2000-05-01"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthEnd(),
]
)

result1 = pd.Index(ser_offset) + ser_daytime
result2 = ser_daytime + pd.Index(ser_offset)

expected = pd.Series(
[
pd.Timestamp("2001-01-01"),
pd.Timestamp("2000-04-01"),
pd.Timestamp("2000-05-31"),
]
)
tm.assert_series_equal(result1, expected)
tm.assert_series_equal(result2, expected)

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_add_daytime_index_offset(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-02-01"),
pd.Timestamp("2000-05-01"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthEnd(),
]
)

result1 = ser_offset + pd.DatetimeIndex(ser_daytime)
result2 = pd.DatetimeIndex(ser_daytime) + ser_offset

expected = pd.Series(
[
pd.Timestamp("2001-01-01"),
pd.Timestamp("2000-04-01"),
pd.Timestamp("2000-05-31"),
]
)
tm.assert_series_equal(result1, expected)
tm.assert_series_equal(result2, expected)

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_sub_daytime_offset(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-03-29"),
pd.Timestamp("2000-05-15"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthBegin(),
]
)

result = ser_daytime - ser_offset

expected = pd.Series(
[
pd.Timestamp("1999-1-1"),
pd.Timestamp("2000-1-29"),
pd.Timestamp("2000-05-01"),
]
)
tm.assert_series_equal(result, expected)

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_sub_daytime_offset_index(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-03-29"),
pd.Timestamp("2000-05-15"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthBegin(),
]
)

result = ser_daytime - pd.Index(ser_offset)

expected = pd.Series(
[
pd.Timestamp("1999-1-1"),
pd.Timestamp("2000-1-29"),
pd.Timestamp("2000-05-01"),
]
)
tm.assert_series_equal(result, expected)

@pytest.mark.filterwarnings(
"ignore:Adding/subtracting object-dtype array to DatetimeArray"
)
def test_series_sub_daytime_index_offset(self):
# GH#19211
ser_daytime = pd.Series(
[
pd.Timestamp("2000-01-01"),
pd.Timestamp("2000-03-29"),
pd.Timestamp("2000-05-15"),
]
)
ser_offset = pd.Series(
[
pd.offsets.DateOffset(years=1),
pd.offsets.DateOffset(months=2),
pd.offsets.MonthBegin(),
]
)

result = pd.DatetimeIndex(ser_daytime) - ser_offset

expected = pd.Series(
[
pd.Timestamp("1999-1-1"),
pd.Timestamp("2000-1-29"),
pd.Timestamp("2000-05-01"),
]
)
tm.assert_series_equal(result, expected)

def test_datetime_understood(self):
# Ensures it doesn't fail to create the right series
# reported in issue#16726
Expand Down