a test case to use with an interval insted of a single value
Python, 32 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | import unittest
class IntervalTestCase( unittest.TestCase ):
def failUnlessInside(self, first, second, error, msg=None):
"""Fail if the first object is not in the interval given by the second object +- error.
"""
if (first > second + error) or (first < second - error):
raise self.failureException, \
(msg or '%s != %s (+-%s)' % (`first`, `second`, `error`))
def failIfInside(self, first, second, error, msg=None):
"""Fail if the first object is in the interval given by the second object +- error.
"""
if (first <= second + error) and (first >= second - error):
raise self.failureException, \
(msg or '%s == %s (+-%s)' % (`first`, `second`, `error`))
assertInside = failUnlessInside
assertNotInside = failIfInside
class IntegerArithmenticTestCase( IntervalTestCase ):
def testAdd(self): ## test method names begin 'test*'
self.assertInside((1 + 2), 3.3, 0.5)
self.assertInside(0 + 1, 1.1, 0.01)
def testMultiply(self):
self.assertNotInside((0 * 10), .1, .05)
self.assertNotInside((5 * 8), 40.1, .2)
if __name__ == '__main__':
unittest.main()
|
if you are implementing aproximation to functions or are studying numerical analysis like me, you'll find it usefull
Take advantage of chained comparisons. This:
can be rewritten as
And this:
can be rewritten as