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Added 'assertNear' for comparing floats in Python unit tests

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This method compares floats using combined absolute and relative tolerances,
instead of the "number of decimal digits" that TestCase.assertAlmostEqual uses.
This commit is contained in:
Ray Speth 2012-05-07 18:20:08 +00:00
parent 79a0165260
commit e2d2ba4e3d
1 changed files with 11 additions and 0 deletions
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11
test/python/utilities.py
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@ -1,4 +1,15 @@
import numpy as np
import unittest
class CanteraTest(unittest.TestCase):
def assertNear(self, a, b, rtol=1e-8, atol=1e-12, msg=None):
cmp = 2 * abs(a - b)/(abs(a) + abs(b) + atol)
if cmp > rtol:
message = ('AssertNear: %.14g - %.14g = %.14g\n' % (a, b, a-b) +
'Relative error of %10e exceeds rtol = %10e' % (cmp, rtol))
if msg:
message = msg + '\n' + message
self.fail(message)
def compareTimeSeries(reference, sample, rtol=1e-5, atol=1e-12):
"""