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test_is_close.py
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test_is_close.py
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#!/usr/bin/env python3
"""
Unit tests for isclose function -- this one tests the experimental
version in is_close.py
"""
import unittest
from decimal import Decimal
from fractions import Fraction
from is_close import isclose
class ErrorTestCase(unittest.TestCase):
"""
Exceptions should be raised if either tolerance is set to less than zero
"""
def test_negative_tol(self):
with self.assertRaises(ValueError):
isclose(1, 1, -1e-100)
def test_negative_abstol(self):
with self.assertRaises(ValueError):
isclose(1, 1, 1e-100, -1e10)
def test_bad_method(self):
with self.assertRaises(ValueError):
isclose(1.0001, 1.0002, method='week')
class CloseTestCase(unittest.TestCase):
""" some methods that make it easier to test a bunch of values"""
def do_close(self, a, b, *args, **kwargs):
self.assertTrue(isclose(a, b, *args, **kwargs),
msg="%s and %s should be close!" % (a, b))
def do_not_close(self, a, b, *args, **kwargs):
self.assertFalse(isclose(a, b, *args, **kwargs),
msg="%s and %s should not be close!" % (a, b))
def do_close_all(self, examples, *args, **kwargs):
for method in ("asymmetric", "strong", "weak", "average"):
for a, b in examples:
kwargs['method'] = method
self.assertTrue(isclose(a, b, *args, **kwargs),
msg=("%s and %s should be close with method:"
" %s" % (a, b, method)))
def do_not_close_all(self, examples, *args, **kwargs):
for method in ("asymmetric", "strong", "weak", "average"):
for a, b in examples:
kwargs['method'] = method
self.assertFalse(isclose(a, b, *args, **kwargs),
msg=("%s and %s should not be close with"
" method: %s" % (a, b, method)))
class ExactTestCase(CloseTestCase):
"""
Make sure exact values test as close
"""
exact_examples = [(2.0, 2.0),
(0.1e200, 0.1e200),
(1.123e-300, 1.123e-300),
(12345, 12345.0),
(0.0, -0.0),
(345678, 345678)
]
def test_exact(self):
# should return close even with zero tolerances
self.do_close_all(self.exact_examples,
rel_tol=0.0,
abs_tol=0.0)
class RelativeTestCase(CloseTestCase):
nums8 = [(1e8, 1e8 + 1),
(-1e-8, -1.000000009e-8),
(1.12345678, 1.12345679),
]
def test_all_8close(self):
self.do_close_all(self.nums8, rel_tol=1e-8)
def test_all_8_not_close(self):
self.do_not_close_all(self.nums8, rel_tol=1e-9)
class ZeroTestCase(CloseTestCase):
nums0 = [(1e-9, 0.0),
(-1e-9, 0.0),
(-1e-150, 0.0),
]
def test_nums8_not_close(self):
# these should not be close to any rel_tol
self.do_not_close_all(self.nums0, rel_tol=0.9)
def test_nums8_close(self):
# these should be close to abs_tol=1e-8
self.do_close_all(self.nums0, abs_tol=1e-8)
class NonFiniteCase(CloseTestCase):
""" test for nan, inf, -inf """
inf = float('inf')
nan = float('nan')
close_examples = [(inf, inf),
(-inf, -inf),
]
not_close_examples = [(nan, nan),
(nan, 1e-100),
(1e-100, nan),
(inf, nan),
(nan, inf),
(inf, -inf),
(inf, 1.0),
(1.0, inf),
]
def test_close(self):
self.do_close_all(self.close_examples, abs_tol=0.999999999999999) # largest tolerance possible
def test_not_close(self):
self.do_not_close_all(self.not_close_examples, abs_tol=0.999999999999999) # largest tolerance possible
class AsymetryTest(CloseTestCase):
"""
tests the assymetry example from the PEP
"""
def test_close(self):
self.do_close(9, 10, rel_tol=0.1, method='asymmetric')
def test_not_close(self):
self.do_not_close(10, 9, rel_tol=0.1, method='asymmetric')
# should pass weak test both orders
def test_close_weak(self):
self.do_close(9, 10, rel_tol=0.1, method='weak')
def test_close_weak_reversed(self):
self.do_close(10, 9, rel_tol=0.1, method='weak')
# should fail strong test both orders
def test_not_close_strong(self):
self.do_not_close(9, 10, rel_tol=0.1, method='strong')
def test_not_close_strong_reversed(self):
self.do_not_close(10, 9, rel_tol=0.1, method='strong')
# should fail average test both ways
def test_not_close_average(self):
self.do_not_close(9, 10, rel_tol=0.1, method='average')
def test_not_close_average_reversed(self):
self.do_not_close(10, 9, rel_tol=0.1, method='average')
class ComplexTests(CloseTestCase):
close_examples = [(1.0+1.0j, 1.000000000001+1.0j),
(1.0+1.0j, 1.0+1.000000000001j),
(-1.0+1.0j, -1.000000000001+1.0j),
(1.0-1.0j, 1.0-0.999999999999j),
]
def test_close(self):
self.do_close_all(self.close_examples, rel_tol=1e-12)
# for a,b in self.close_examples:
# self.do_close(a, b, rel_tol=1e-12)
def test_not_close(self):
self.do_not_close_all(self.close_examples, rel_tol=1e-13)
# for a,b in self.close_examples:
# self.do_not_close(a, b, rel_tol=1e-14)
class TestInteger(CloseTestCase):
close_examples = [(100000001, 100000000),
(123456789, 123456788)
]
def test_close(self):
self.do_close_all(self.close_examples, rel_tol=1e-8)
def test_not_close(self):
self.do_not_close_all(self.close_examples, rel_tol=1e-9)
class TestDecimal(CloseTestCase):
close_examples = [(Decimal('1.00000001'), Decimal('1.0')),
(Decimal('1.00000001e-20'), Decimal('1.0e-20')),
(Decimal('1.00000001e-100'), Decimal('1.0e-100')),
]
def test_close(self):
self.do_close_all(self.close_examples, rel_tol=Decimal('1e-8'))
def test_not_close(self):
self.do_not_close_all(self.close_examples, rel_tol=Decimal('1e-9'))
# def test_close(self):
# self.do_close_all(self.close_examples, rel_tol=1e-8)
# def test_not_close(self):
# self.do_not_close_all(self.close_examples, rel_tol=1e-9)
class TestFraction(CloseTestCase):
# could use some more here!
close_examples = [(Fraction(1, 100000000) + 1, Fraction(1)),
]
def test_close(self):
self.do_close_all(self.close_examples, rel_tol=1e-8)
def test_not_close(self):
self.do_not_close_all(self.close_examples, rel_tol=1e-9)