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TST/REF: Add pytest idiom to test_frequencies.py #25430

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149 changes: 149 additions & 0 deletions pandas/tests/tseries/frequencies/test_freq_code.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,149 @@
import pytest

from pandas._libs.tslibs import frequencies as libfrequencies, resolution
from pandas._libs.tslibs.frequencies import (
FreqGroup, _period_code_map, get_freq, get_freq_code)
import pandas.compat as compat

import pandas.tseries.offsets as offsets


@pytest.fixture(params=list(compat.iteritems(_period_code_map)))
def period_code_item(request):
return request.param


@pytest.mark.parametrize("freqstr,expected", [
("A", 1000), ("3A", 1000), ("-1A", 1000),
("Y", 1000), ("3Y", 1000), ("-1Y", 1000),
("W", 4000), ("W-MON", 4001), ("W-FRI", 4005)
])
def test_freq_code(freqstr, expected):
assert get_freq(freqstr) == expected


def test_freq_code_match(period_code_item):
freqstr, code = period_code_item
assert get_freq(freqstr) == code


@pytest.mark.parametrize("freqstr,expected", [
("A", 1000), ("3A", 1000), ("-1A", 1000), ("A-JAN", 1000),
("A-MAY", 1000), ("Y", 1000), ("3Y", 1000), ("-1Y", 1000),
("Y-JAN", 1000), ("Y-MAY", 1000), (offsets.YearEnd(), 1000),
(offsets.YearEnd(month=1), 1000), (offsets.YearEnd(month=5), 1000),
("W", 4000), ("W-MON", 4000), ("W-FRI", 4000), (offsets.Week(), 4000),
(offsets.Week(weekday=1), 4000), (offsets.Week(weekday=5), 4000),
("T", FreqGroup.FR_MIN),
])
def test_freq_group(freqstr, expected):
assert resolution.get_freq_group(freqstr) == expected


def test_freq_group_match(period_code_item):
freqstr, code = period_code_item

str_group = resolution.get_freq_group(freqstr)
code_group = resolution.get_freq_group(code)

assert str_group == code_group == code // 1000 * 1000


@pytest.mark.parametrize("freqstr,exp_freqstr", [
("D", "D"), ("W", "D"), ("M", "D"),
("S", "S"), ("T", "S"), ("H", "S")
])
def test_get_to_timestamp_base(freqstr, exp_freqstr):
tsb = libfrequencies.get_to_timestamp_base

assert tsb(get_freq_code(freqstr)[0]) == get_freq_code(exp_freqstr)[0]


_reso = resolution.Resolution


@pytest.mark.parametrize("freqstr,expected", [
("A", "year"), ("Q", "quarter"), ("M", "month"),
("D", "day"), ("H", "hour"), ("T", "minute"),
("S", "second"), ("L", "millisecond"),
("U", "microsecond"), ("N", "nanosecond")
])
def test_get_str_from_freq(freqstr, expected):
assert _reso.get_str_from_freq(freqstr) == expected


@pytest.mark.parametrize("freq", ["A", "Q", "M", "D", "H",
"T", "S", "L", "U", "N"])
def test_get_freq_roundtrip(freq):
result = _reso.get_freq(_reso.get_str_from_freq(freq))
assert freq == result


@pytest.mark.parametrize("freq", ["D", "H", "T", "S", "L", "U"])
def test_get_freq_roundtrip2(freq):
result = _reso.get_freq(_reso.get_str(_reso.get_reso_from_freq(freq)))
assert freq == result


@pytest.mark.parametrize("args,expected", [
((1.5, "T"), (90, "S")), ((62.4, "T"), (3744, "S")),
((1.04, "H"), (3744, "S")), ((1, "D"), (1, "D")),
((0.342931, "H"), (1234551600, "U")), ((1.2345, "D"), (106660800, "L"))
])
def test_resolution_bumping(args, expected):
# see gh-14378
assert _reso.get_stride_from_decimal(*args) == expected


@pytest.mark.parametrize("args", [
(0.5, "N"),

# Too much precision in the input can prevent.
(0.3429324798798269273987982, "H")
])
def test_cat(args):
msg = "Could not convert to integer offset at any resolution"

with pytest.raises(ValueError, match=msg):
_reso.get_stride_from_decimal(*args)


@pytest.mark.parametrize("freq_input,expected", [
# Frequency string.
("A", (get_freq("A"), 1)),
("3D", (get_freq("D"), 3)),
("-2M", (get_freq("M"), -2)),

# Tuple.
(("D", 1), (get_freq("D"), 1)),
(("A", 3), (get_freq("A"), 3)),
(("M", -2), (get_freq("M"), -2)),
((5, "T"), (FreqGroup.FR_MIN, 5)),

# Numeric Tuple.
((1000, 1), (1000, 1)),

# Offsets.
(offsets.Day(), (get_freq("D"), 1)),
(offsets.Day(3), (get_freq("D"), 3)),
(offsets.Day(-2), (get_freq("D"), -2)),
(offsets.MonthEnd(), (get_freq("M"), 1)),
(offsets.MonthEnd(3), (get_freq("M"), 3)),
(offsets.MonthEnd(-2), (get_freq("M"), -2)),
(offsets.Week(), (get_freq("W"), 1)),
(offsets.Week(3), (get_freq("W"), 3)),
(offsets.Week(-2), (get_freq("W"), -2)),
(offsets.Hour(), (FreqGroup.FR_HR, 1)),

# Monday is weekday=0.
(offsets.Week(weekday=1), (get_freq("W-TUE"), 1)),
(offsets.Week(3, weekday=0), (get_freq("W-MON"), 3)),
(offsets.Week(-2, weekday=4), (get_freq("W-FRI"), -2)),
])
def test_get_freq_code(freq_input, expected):
assert get_freq_code(freq_input) == expected


def test_get_code_invalid():
with pytest.raises(ValueError, match="Invalid frequency"):
get_freq_code((5, "baz"))
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