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TST: reorganize misplaced year / business year tests (#27085) #42930

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Aug 8, 2021
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TST: reorganize misplaced year / business year tests (#27085) #42930

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220 changes: 220 additions & 0 deletions pandas/tests/tseries/offsets/test_business_year.py
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Original file line number Diff line number Diff line change
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"""
Tests for the following offsets:
- BYearBegin
- BYearEnd
"""
from datetime import datetime

import pytest

from pandas.tests.tseries.offsets.common import (
Base,
assert_is_on_offset,
assert_offset_equal,
)

from pandas.tseries.offsets import (
BYearBegin,
BYearEnd,
)


class TestBYearBegin(Base):
_offset = BYearBegin

def test_misspecified(self):
msg = "Month must go from 1 to 12"
with pytest.raises(ValueError, match=msg):
BYearBegin(month=13)
with pytest.raises(ValueError, match=msg):
BYearEnd(month=13)

offset_cases = []
offset_cases.append(
(
BYearBegin(),
{
datetime(2008, 1, 1): datetime(2009, 1, 1),
datetime(2008, 6, 30): datetime(2009, 1, 1),
datetime(2008, 12, 31): datetime(2009, 1, 1),
datetime(2011, 1, 1): datetime(2011, 1, 3),
datetime(2011, 1, 3): datetime(2012, 1, 2),
datetime(2005, 12, 30): datetime(2006, 1, 2),
datetime(2005, 12, 31): datetime(2006, 1, 2),
},
)
)

offset_cases.append(
(
BYearBegin(0),
{
datetime(2008, 1, 1): datetime(2008, 1, 1),
datetime(2008, 6, 30): datetime(2009, 1, 1),
datetime(2008, 12, 31): datetime(2009, 1, 1),
datetime(2005, 12, 30): datetime(2006, 1, 2),
datetime(2005, 12, 31): datetime(2006, 1, 2),
},
)
)

offset_cases.append(
(
BYearBegin(-1),
{
datetime(2007, 1, 1): datetime(2006, 1, 2),
datetime(2009, 1, 4): datetime(2009, 1, 1),
datetime(2009, 1, 1): datetime(2008, 1, 1),
datetime(2008, 6, 30): datetime(2008, 1, 1),
datetime(2008, 12, 31): datetime(2008, 1, 1),
datetime(2006, 12, 29): datetime(2006, 1, 2),
datetime(2006, 12, 30): datetime(2006, 1, 2),
datetime(2006, 1, 1): datetime(2005, 1, 3),
},
)
)

offset_cases.append(
(
BYearBegin(-2),
{
datetime(2007, 1, 1): datetime(2005, 1, 3),
datetime(2007, 6, 30): datetime(2006, 1, 2),
datetime(2008, 12, 31): datetime(2007, 1, 1),
},
)
)

@pytest.mark.parametrize("case", offset_cases)
def test_offset(self, case):
offset, cases = case
for base, expected in cases.items():
assert_offset_equal(offset, base, expected)


class TestBYearEnd(Base):
_offset = BYearEnd

offset_cases = []
offset_cases.append(
(
BYearEnd(),
{
datetime(2008, 1, 1): datetime(2008, 12, 31),
datetime(2008, 6, 30): datetime(2008, 12, 31),
datetime(2008, 12, 31): datetime(2009, 12, 31),
datetime(2005, 12, 30): datetime(2006, 12, 29),
datetime(2005, 12, 31): datetime(2006, 12, 29),
},
)
)

offset_cases.append(
(
BYearEnd(0),
{
datetime(2008, 1, 1): datetime(2008, 12, 31),
datetime(2008, 6, 30): datetime(2008, 12, 31),
datetime(2008, 12, 31): datetime(2008, 12, 31),
datetime(2005, 12, 31): datetime(2006, 12, 29),
},
)
)

offset_cases.append(
(
BYearEnd(-1),
{
datetime(2007, 1, 1): datetime(2006, 12, 29),
datetime(2008, 6, 30): datetime(2007, 12, 31),
datetime(2008, 12, 31): datetime(2007, 12, 31),
datetime(2006, 12, 29): datetime(2005, 12, 30),
datetime(2006, 12, 30): datetime(2006, 12, 29),
datetime(2007, 1, 1): datetime(2006, 12, 29),
},
)
)

offset_cases.append(
(
BYearEnd(-2),
{
datetime(2007, 1, 1): datetime(2005, 12, 30),
datetime(2008, 6, 30): datetime(2006, 12, 29),
datetime(2008, 12, 31): datetime(2006, 12, 29),
},
)
)

@pytest.mark.parametrize("case", offset_cases)
def test_offset(self, case):
offset, cases = case
for base, expected in cases.items():
assert_offset_equal(offset, base, expected)

on_offset_cases = [
(BYearEnd(), datetime(2007, 12, 31), True),
(BYearEnd(), datetime(2008, 1, 1), False),
(BYearEnd(), datetime(2006, 12, 31), False),
(BYearEnd(), datetime(2006, 12, 29), True),
]

@pytest.mark.parametrize("case", on_offset_cases)
def test_is_on_offset(self, case):
offset, dt, expected = case
assert_is_on_offset(offset, dt, expected)


class TestBYearEndLagged(Base):
_offset = BYearEnd

def test_bad_month_fail(self):
msg = "Month must go from 1 to 12"
with pytest.raises(ValueError, match=msg):
BYearEnd(month=13)
with pytest.raises(ValueError, match=msg):
BYearEnd(month=0)

offset_cases = []
offset_cases.append(
(
BYearEnd(month=6),
{
datetime(2008, 1, 1): datetime(2008, 6, 30),
datetime(2007, 6, 30): datetime(2008, 6, 30),
},
)
)

offset_cases.append(
(
BYearEnd(n=-1, month=6),
{
datetime(2008, 1, 1): datetime(2007, 6, 29),
datetime(2007, 6, 30): datetime(2007, 6, 29),
},
)
)

@pytest.mark.parametrize("case", offset_cases)
def test_offset(self, case):
offset, cases = case
for base, expected in cases.items():
assert_offset_equal(offset, base, expected)

def test_roll(self):
offset = BYearEnd(month=6)
date = datetime(2009, 11, 30)

assert offset.rollforward(date) == datetime(2010, 6, 30)
assert offset.rollback(date) == datetime(2009, 6, 30)

on_offset_cases = [
(BYearEnd(month=2), datetime(2007, 2, 28), True),
(BYearEnd(month=6), datetime(2007, 6, 30), False),
]

@pytest.mark.parametrize("case", on_offset_cases)
def test_is_on_offset(self, case):
offset, dt, expected = case
assert_is_on_offset(offset, dt, expected)
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