mirror of https://github.com/python/cpython
76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
'''
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Tests for fpformat module
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Nick Mathewson
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'''
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from test.test_support import run_unittest
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import unittest
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from fpformat import fix, sci, NotANumber
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StringType = type('')
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# Test the old and obsolescent fpformat module.
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#
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# (It's obsolescent because fix(n,d) == "%.*f"%(d,n) and
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# sci(n,d) == "%.*e"%(d,n)
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# for all reasonable numeric n and d, except that sci gives 3 exponent
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# digits instead of 2.
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#
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# Differences only occur for unreasonable n and d. <.2 wink>)
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class FpformatTest(unittest.TestCase):
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def checkFix(self, n, digits):
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result = fix(n, digits)
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if isinstance(n, StringType):
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n = repr(n)
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expected = "%.*f" % (digits, float(n))
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self.assertEquals(result, expected)
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def checkSci(self, n, digits):
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result = sci(n, digits)
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if isinstance(n, StringType):
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n = repr(n)
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expected = "%.*e" % (digits, float(n))
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# add the extra 0 if needed
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num, exp = expected.split("e")
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if len(exp) < 4:
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exp = exp[0] + "0" + exp[1:]
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expected = "%se%s" % (num, exp)
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self.assertEquals(result, expected)
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def test_basic_cases(self):
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self.assertEquals(fix(100.0/3, 3), '33.333')
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self.assertEquals(sci(100.0/3, 3), '3.333e+001')
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def test_reasonable_values(self):
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for d in range(7):
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for val in (1000.0/3, 1000, 1000.0, .002, 1.0/3, 1e10):
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for realVal in (val, 1.0/val, -val, -1.0/val):
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self.checkFix(realVal, d)
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self.checkSci(realVal, d)
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def test_failing_values(self):
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# Now for 'unreasonable n and d'
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self.assertEquals(fix(1.0, 1000), '1.'+('0'*1000))
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self.assertEquals(sci("1"+('0'*1000), 0), '1e+1000')
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# This behavior is inconsistent. sci raises an exception; fix doesn't.
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yacht = "Throatwobbler Mangrove"
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self.assertEquals(fix(yacht, 10), yacht)
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try:
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sci(yacht, 10)
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except NotANumber:
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pass
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else:
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self.fail("No exception on non-numeric sci")
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def test_main():
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run_unittest(FpformatTest)
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if __name__ == "__main__":
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test_main()
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