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55 lines
2.2 KiB
Python
55 lines
2.2 KiB
Python
from __future__ import division
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# When true division is the default, get rid of this and add it to
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# test_long.py instead. In the meantime, it's too obscure to try to
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# trick just part of test_long into using future division.
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import unittest
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from test.test_support import run_unittest
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class TrueDivisionTests(unittest.TestCase):
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def test(self):
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huge = 1L << 40000
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mhuge = -huge
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self.assertEqual(huge / huge, 1.0)
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self.assertEqual(mhuge / mhuge, 1.0)
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self.assertEqual(huge / mhuge, -1.0)
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self.assertEqual(mhuge / huge, -1.0)
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self.assertEqual(1 / huge, 0.0)
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self.assertEqual(1L / huge, 0.0)
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self.assertEqual(1 / mhuge, 0.0)
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self.assertEqual(1L / mhuge, 0.0)
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self.assertEqual((666 * huge + (huge >> 1)) / huge, 666.5)
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self.assertEqual((666 * mhuge + (mhuge >> 1)) / mhuge, 666.5)
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self.assertEqual((666 * huge + (huge >> 1)) / mhuge, -666.5)
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self.assertEqual((666 * mhuge + (mhuge >> 1)) / huge, -666.5)
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self.assertEqual(huge / (huge << 1), 0.5)
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self.assertEqual((1000000 * huge) / huge, 1000000)
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namespace = {'huge': huge, 'mhuge': mhuge}
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for overflow in ["float(huge)", "float(mhuge)",
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"huge / 1", "huge / 2L", "huge / -1", "huge / -2L",
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"mhuge / 100", "mhuge / 100L"]:
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# XXX(cwinter) this test doesn't pass when converted to
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# use assertRaises.
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try:
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eval(overflow, namespace)
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self.fail("expected OverflowError from %r" % overflow)
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except OverflowError:
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pass
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for underflow in ["1 / huge", "2L / huge", "-1 / huge", "-2L / huge",
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"100 / mhuge", "100L / mhuge"]:
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result = eval(underflow, namespace)
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self.assertEqual(result, 0.0,
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"expected underflow to 0 from %r" % underflow)
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for zero in ["huge / 0", "huge / 0L", "mhuge / 0", "mhuge / 0L"]:
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self.assertRaises(ZeroDivisionError, eval, zero, namespace)
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def test_main():
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run_unittest(TrueDivisionTests)
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if __name__ == "__main__":
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test_main()
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