Lib/test/test_types.py

# Python test set -- part 6, built-in types

from test.test_support import run_unittest, have_unicode
import unittest
import sys

class TypesTests(unittest.TestCase):

    def test_truth_values(self):
        if None: self.fail('None is true instead of false')
        if 0: self.fail('0 is true instead of false')
        if 0: self.fail('0L is true instead of false')
        if 0.0: self.fail('0.0 is true instead of false')
        if '': self.fail('\'\' is true instead of false')
        if not 1: self.fail('1 is false instead of true')
        if not 1: self.fail('1L is false instead of true')
        if not 1.0: self.fail('1.0 is false instead of true')
        if not 'x': self.fail('\'x\' is false instead of true')
        if not {'x': 1}: self.fail('{\'x\': 1} is false instead of true')
        def f(): pass
        class C: pass
        import sys
        x = C()
        if not f: self.fail('f is false instead of true')
        if not C: self.fail('C is false instead of true')
        if not sys: self.fail('sys is false instead of true')
        if not x: self.fail('x is false instead of true')

    def test_boolean_ops(self):
        if 0 or 0: self.fail('0 or 0 is true instead of false')
        if 1 and 1: pass
        else: self.fail('1 and 1 is false instead of true')
        if not 1: self.fail('not 1 is true instead of false')

    def test_comparisons(self):
        if 0 < 1 <= 1 == 1 >= 1 > 0 != 1: pass
        else: self.fail('int comparisons failed')
        if 0 < 1 <= 1 == 1 >= 1 > 0 != 1: pass
        else: self.fail('long int comparisons failed')
        if 0.0 < 1.0 <= 1.0 == 1.0 >= 1.0 > 0.0 != 1.0: pass
        else: self.fail('float comparisons failed')
        if '' < 'a' <= 'a' == 'a' < 'abc' < 'abd' < 'b': pass
        else: self.fail('string comparisons failed')
        if None is None: pass
        else: self.fail('identity test failed')

    def test_float_constructor(self):
        self.assertRaises(ValueError, float, '')
        self.assertRaises(ValueError, float, '5\0')

    def test_zero_division(self):
        try: 5.0 / 0.0
        except ZeroDivisionError: pass
        else: self.fail("5.0 / 0.0 didn't raise ZeroDivisionError")

        try: 5.0 // 0.0
        except ZeroDivisionError: pass
        else: self.fail("5.0 // 0.0 didn't raise ZeroDivisionError")

        try: 5.0 % 0.0
        except ZeroDivisionError: pass
        else: self.fail("5.0 % 0.0 didn't raise ZeroDivisionError")

        try: 5 / 0
        except ZeroDivisionError: pass
        else: self.fail("5 / 0L didn't raise ZeroDivisionError")

        try: 5 // 0
        except ZeroDivisionError: pass
        else: self.fail("5 // 0L didn't raise ZeroDivisionError")

        try: 5 % 0
        except ZeroDivisionError: pass
        else: self.fail("5 % 0L didn't raise ZeroDivisionError")

    def test_numeric_types(self):
        if 0 != 0 or 0 != 0.0 or 0 != 0.0: self.fail('mixed comparisons')
        if 1 != 1 or 1 != 1.0 or 1 != 1.0: self.fail('mixed comparisons')
        if -1 != -1 or -1 != -1.0 or -1 != -1.0:
            self.fail('int/long/float value not equal')
        # calling built-in types without argument must return 0
        if int() != 0: self.fail('int() does not return 0')
        if int() != 0: self.fail('long() does not return 0L')
        if float() != 0.0: self.fail('float() does not return 0.0')
        if int(1.9) == 1 == int(1.1) and int(-1.1) == -1 == int(-1.9): pass
        else: self.fail('int() does not round properly')
        if int(1.9) == 1 == int(1.1) and int(-1.1) == -1 == int(-1.9): pass
        else: self.fail('long() does not round properly')
        if float(1) == 1.0 and float(-1) == -1.0 and float(0) == 0.0: pass
        else: self.fail('float() does not work properly')

    def test_normal_integers(self):
        # Ensure the first 256 integers are shared
        a = 256
        b = 128*2
        if a is not b: self.fail('256 is not shared')
        if 12 + 24 != 36: self.fail('int op')
        if 12 + (-24) != -12: self.fail('int op')
        if (-12) + 24 != 12: self.fail('int op')
        if (-12) + (-24) != -36: self.fail('int op')
        if not 12 < 24: self.fail('int op')
        if not -24 < -12: self.fail('int op')
        # Test for a particular bug in integer multiply
        xsize, ysize, zsize = 238, 356, 4
        if not (xsize*ysize*zsize == zsize*xsize*ysize == 338912):
            self.fail('int mul commutativity')
        # And another.
        m = -sys.maxint - 1
        for divisor in 1, 2, 4, 8, 16, 32:
            j = m // divisor
            prod = divisor * j
            if prod != m:
                self.fail("%r * %r == %r != %r" % (divisor, j, prod, m))
            if type(prod) is not int:
                self.fail("expected type(prod) to be int, not %r" %
                                   type(prod))
        # Check for expected * overflow to long.
        for divisor in 1, 2, 4, 8, 16, 32:
            j = m // divisor - 1
            prod = divisor * j
            if type(prod) is not int:
                self.fail("expected type(%r) to be long, not %r" %
                                   (prod, type(prod)))
        # Check for expected * overflow to long.
        m = sys.maxint
        for divisor in 1, 2, 4, 8, 16, 32:
            j = m // divisor + 1
            prod = divisor * j
            if type(prod) is not int:
                self.fail("expected type(%r) to be long, not %r" %
                                   (prod, type(prod)))

    def test_long_integers(self):
        if 12 + 24 != 36: self.fail('long op')
        if 12 + (-24) != -12: self.fail('long op')
        if (-12) + 24 != 12: self.fail('long op')
        if (-12) + (-24) != -36: self.fail('long op')
        if not 12 < 24: self.fail('long op')
        if not -24 < -12: self.fail('long op')
        x = sys.maxint
        if int(int(x)) != x: self.fail('long op')
        try: y = int(int(x)+1)
        except OverflowError: self.fail('long op')
        if not isinstance(y, int): self.fail('long op')
        x = -x
        if int(int(x)) != x: self.fail('long op')
        x = x-1
        if int(int(x)) != x: self.fail('long op')
        try: y = int(int(x)-1)
        except OverflowError: self.fail('long op')
        if not isinstance(y, int): self.fail('long op')

        try: 5 << -5
        except ValueError: pass
        else: self.fail('int negative shift <<')

        try: 5 << -5
        except ValueError: pass
        else: self.fail('long negative shift <<')

        try: 5 >> -5
        except ValueError: pass
        else: self.fail('int negative shift >>')

        try: 5 >> -5
        except ValueError: pass
        else: self.fail('long negative shift >>')

    def test_floats(self):
        if 12.0 + 24.0 != 36.0: self.fail('float op')
        if 12.0 + (-24.0) != -12.0: self.fail('float op')
        if (-12.0) + 24.0 != 12.0: self.fail('float op')
        if (-12.0) + (-24.0) != -36.0: self.fail('float op')
        if not 12.0 < 24.0: self.fail('float op')
        if not -24.0 < -12.0: self.fail('float op')

    def test_strings(self):
        if len('') != 0: self.fail('len(\'\')')
        if len('a') != 1: self.fail('len(\'a\')')
        if len('abcdef') != 6: self.fail('len(\'abcdef\')')
        if 'xyz' + 'abcde' != 'xyzabcde': self.fail('string concatenation')
        if 'xyz'*3 != 'xyzxyzxyz': self.fail('string repetition *3')
        if 0*'abcde' != '': self.fail('string repetition 0*')
        if min('abc') != 'a' or max('abc') != 'c': self.fail('min/max string')
        if 'a' in 'abc' and 'b' in 'abc' and 'c' in 'abc' and 'd' not in 'abc': pass
        else: self.fail('in/not in string')
        x = 'x'*103
        if '%s!'%x != x+'!': self.fail('nasty string formatting bug')

        #extended slices for strings
        a = '0123456789'
        self.assertEqual(a[::], a)
        self.assertEqual(a[::2], '02468')
        self.assertEqual(a[1::2], '13579')
        self.assertEqual(a[::-1],'9876543210')
        self.assertEqual(a[::-2], '97531')
        self.assertEqual(a[3::-2], '31')
        self.assertEqual(a[-100:100:], a)
        self.assertEqual(a[100:-100:-1], a[::-1])
        self.assertEqual(a[-100:100:2], '02468')

        if have_unicode:
            a = str('0123456789', 'ascii')
            self.assertEqual(a[::], a)
            self.assertEqual(a[::2], str('02468', 'ascii'))
            self.assertEqual(a[1::2], str('13579', 'ascii'))
            self.assertEqual(a[::-1], str('9876543210', 'ascii'))
            self.assertEqual(a[::-2], str('97531', 'ascii'))
            self.assertEqual(a[3::-2], str('31', 'ascii'))
            self.assertEqual(a[-100:100:], a)
            self.assertEqual(a[100:-100:-1], a[::-1])
            self.assertEqual(a[-100:100:2], str('02468', 'ascii'))


    def test_type_function(self):
        self.assertRaises(TypeError, type, 1, 2)
        self.assertRaises(TypeError, type, 1, 2, 3, 4)

    def test_buffers(self):
        self.assertRaises(ValueError, buffer, 'asdf', -1)
        self.assertRaises(TypeError, buffer, None)

        a = buffer('asdf')
        hash(a)
        b = a * 5
        if a == b:
            self.fail('buffers should not be equal')
        if str(b) != ('asdf' * 5):
            self.fail('repeated buffer has wrong content')
        if str(a * 0) != '':
            self.fail('repeated buffer zero times has wrong content')
        if str(a + buffer('def')) != 'asdfdef':
            self.fail('concatenation of buffers yields wrong content')
        if str(buffer(a)) != 'asdf':
            self.fail('composing buffers failed')
        if str(buffer(a, 2)) != 'df':
            self.fail('specifying buffer offset failed')
        if str(buffer(a, 0, 2)) != 'as':
            self.fail('specifying buffer size failed')
        if str(buffer(a, 1, 2)) != 'sd':
            self.fail('specifying buffer offset and size failed')
        self.assertRaises(ValueError, buffer, buffer('asdf', 1), -1)
        if str(buffer(buffer('asdf', 0, 2), 0)) != 'as':
            self.fail('composing length-specified buffer failed')
        if str(buffer(buffer('asdf', 0, 2), 0, 5000)) != 'as':
            self.fail('composing length-specified buffer failed')
        if str(buffer(buffer('asdf', 0, 2), 0, -1)) != 'as':
            self.fail('composing length-specified buffer failed')
        if str(buffer(buffer('asdf', 0, 2), 1, 2)) != 's':
            self.fail('composing length-specified buffer failed')

        try: a[1] = 'g'
        except TypeError: pass
        else: self.fail("buffer assignment should raise TypeError")

        try: a[0:1] = 'g'
        except TypeError: pass
        else: self.fail("buffer slice assignment should raise TypeError")

        # array.array() returns an object that does not implement a char buffer,
        # something which int() uses for conversion.
        import array
        try: int(buffer(array.array('c')))
        except TypeError: pass
        else: self.fail("char buffer (at C level) not working")

def test_main():
    run_unittest(TypesTests)

if __name__ == '__main__':
    test_main()