cpython/Lib/test/test_xrange.py

# Python test set -- built-in functions

import test.test_support, unittest
import sys

import warnings
warnings.filterwarnings("ignore", "integer argument expected",
                        DeprecationWarning, "unittest")

class XrangeTest(unittest.TestCase):
    def test_xrange(self):
        self.assertEqual(list(xrange(3)), [0, 1, 2])
        self.assertEqual(list(xrange(1, 5)), [1, 2, 3, 4])
        self.assertEqual(list(xrange(0)), [])
        self.assertEqual(list(xrange(-3)), [])
        self.assertEqual(list(xrange(1, 10, 3)), [1, 4, 7])
        self.assertEqual(list(xrange(5, -5, -3)), [5, 2, -1, -4])

        a = 10
        b = 100
        c = 50

        self.assertEqual(list(xrange(a, a+2)), [a, a+1])
        self.assertEqual(list(xrange(a+2, a, -1L)), [a+2, a+1])
        self.assertEqual(list(xrange(a+4, a, -2)), [a+4, a+2])

        seq = list(xrange(a, b, c))
        self.assert_(a in seq)
        self.assert_(b not in seq)
        self.assertEqual(len(seq), 2)

        seq = list(xrange(b, a, -c))
        self.assert_(b in seq)
        self.assert_(a not in seq)
        self.assertEqual(len(seq), 2)

        seq = list(xrange(-a, -b, -c))
        self.assert_(-a in seq)
        self.assert_(-b not in seq)
        self.assertEqual(len(seq), 2)

        self.assertRaises(TypeError, xrange)
        self.assertRaises(TypeError, xrange, 1, 2, 3, 4)
        self.assertRaises(ValueError, xrange, 1, 2, 0)

        self.assertRaises(TypeError, xrange, 0.0, 2, 1)
        self.assertRaises(TypeError, xrange, 1, 2.0, 1)
        self.assertRaises(TypeError, xrange, 1, 2, 1.0)
        self.assertRaises(TypeError, xrange, 1e100, 1e101, 1e101)

        self.assertRaises(TypeError, xrange, 0, "spam")
        self.assertRaises(TypeError, xrange, 0, 42, "spam")

        self.assertEqual(len(xrange(0, sys.maxint, sys.maxint-1)), 2)

        self.assertRaises(OverflowError, xrange, -sys.maxint, sys.maxint)
        self.assertRaises(OverflowError, xrange, 0, 2*sys.maxint)

        r = xrange(-sys.maxint, sys.maxint, 2)
        if sys.maxint > 0x7fffffff:
            # XXX raising ValueError is less than ideal, but this can't
            # be fixed until range_length() returns a long in rangeobject.c
            self.assertRaises(ValueError, len, r)
        else:
            self.assertEqual(len(r), sys.maxint)
        self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2)

def test_main():
    test.test_support.run_unittest(XrangeTest)

if __name__ == "__main__":
    test_main()