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gh-109546: Add more tests for formatting floats and fractions (GH-109548)

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Serhiy Storchaka 2023-09-19 08:09:11 +03:00 • committed by GitHub
parent c829975428
commit beb5ec5817
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2 changed files with 35 additions and 2 deletions
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9
Lib/test/test_float.py
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@ -733,8 +733,13 @@ class FormatTestCase(unittest.TestCase):
lhs, rhs = map(str.strip, line.split('->'))
fmt, arg = lhs.split()
self.assertEqual(fmt % float(arg), rhs)
self.assertEqual(fmt % -float(arg), '-' + rhs)
f = float(arg)
self.assertEqual(fmt % f, rhs)
self.assertEqual(fmt % -f, '-' + rhs)
if fmt != '%r':
fmt2 = fmt[1:]
self.assertEqual(format(f, fmt2), rhs)
self.assertEqual(format(-f, fmt2), '-' + rhs)
def test_issue5864(self):
self.assertEqual(format(123.456, '.4'), '123.5')

28
Lib/test/test_fractions.py
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@ -7,6 +7,7 @@ import numbers
import operator
import fractions
import functools
import os
import sys
import typing
import unittest
@ -15,6 +16,9 @@ import pickle
from pickle import dumps, loads
F = fractions.Fraction
#locate file with float format test values
test_dir = os.path.dirname(__file__) or os.curdir
format_testfile = os.path.join(test_dir, 'formatfloat_testcases.txt')
class DummyFloat(object):
"""Dummy float class for testing comparisons with Fractions"""
@ -1220,6 +1224,30 @@ class FractionTest(unittest.TestCase):
with self.assertRaises(ValueError):
format(fraction, spec)
@requires_IEEE_754
def test_float_format_testfile(self):
with open(format_testfile, encoding="utf-8") as testfile:
for line in testfile:
if line.startswith('--'):
continue
line = line.strip()
if not line:
continue
lhs, rhs = map(str.strip, line.split('->'))
fmt, arg = lhs.split()
if fmt == '%r':
continue
fmt2 = fmt[1:]
with self.subTest(fmt=fmt, arg=arg):
f = F(float(arg))
self.assertEqual(format(f, fmt2), rhs)
if f: # skip negative zero
self.assertEqual(format(-f, fmt2), '-' + rhs)
f = F(arg)
self.assertEqual(float(format(f, fmt2)), float(rhs))
self.assertEqual(float(format(-f, fmt2)), float('-' + rhs))
if __name__ == '__main__':
unittest.main()