Method test_new_features

Lib/test/test_struct.py:90–148

(self)

                self.assertEqual(tp, t)

    def test_new_features(self):
        # Test some of the new features in detail
        # (format, argument, big-endian result, little-endian result, asymmetric)
        tests = [
            ('c', b'a', b'a', b'a', 0),
            ('xc', b'a', b'\0a', b'\0a', 0),
            ('cx', b'a', b'a\0', b'a\0', 0),
            ('s', b'a', b'a', b'a', 0),
            ('0s', b'helloworld', b'', b'', 1),
            ('1s', b'helloworld', b'h', b'h', 1),
            ('9s', b'helloworld', b'helloworl', b'helloworl', 1),
            ('10s', b'helloworld', b'helloworld', b'helloworld', 0),
            ('11s', b'helloworld', b'helloworld\0', b'helloworld\0', 1),
            ('20s', b'helloworld', b'helloworld'+10*b'\0', b'helloworld'+10*b'\0', 1),
            ('0p', b'helloworld', b'', b'', 1),
            ('1p', b'helloworld', b'\x00', b'\x00', 1),
            ('2p', b'helloworld', b'\x01h', b'\x01h', 1),
            ('10p', b'helloworld', b'\x09helloworl', b'\x09helloworl', 1),
            ('11p', b'helloworld', b'\x0Ahelloworld', b'\x0Ahelloworld', 0),
            ('12p', b'helloworld', b'\x0Ahelloworld\0', b'\x0Ahelloworld\0', 1),
            ('20p', b'helloworld', b'\x0Ahelloworld'+9*b'\0', b'\x0Ahelloworld'+9*b'\0', 1),
            ('b', 7, b'\7', b'\7', 0),
            ('b', -7, b'\371', b'\371', 0),
            ('B', 7, b'\7', b'\7', 0),
            ('B', 249, b'\371', b'\371', 0),
            ('h', 700, b'\002\274', b'\274\002', 0),
            ('h', -700, b'\375D', b'D\375', 0),
            ('H', 700, b'\002\274', b'\274\002', 0),
            ('H', 0x10000-700, b'\375D', b'D\375', 0),
            ('i', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
            ('i', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
            ('I', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
            ('I', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
            ('l', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
            ('l', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
            ('L', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
            ('L', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
            ('f', 2.0, b'@\000\000\000', b'\000\000\000@', 0),
            ('d', 2.0, b'@\000\000\000\000\000\000\000',
                       b'\000\000\000\000\000\000\000@', 0),
            ('f', -2.0, b'\300\000\000\000', b'\000\000\000\300', 0),
            ('d', -2.0, b'\300\000\000\000\000\000\000\000',
                        b'\000\000\000\000\000\000\000\300', 0),
            ('?', 0, b'\0', b'\0', 0),
            ('?', 3, b'\1', b'\1', 1),
            ('?', True, b'\1', b'\1', 0),
            ('?', [], b'\0', b'\0', 1),
            ('?', (1,), b'\1', b'\1', 1),
        ]

        for fmt, arg, big, lil, asy in tests:
            for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
                                ('='+fmt, ISBIGENDIAN and big or lil)]:
                res = struct.pack(xfmt, arg)
                self.assertEqual(res, exp)
                self.assertEqual(struct.calcsize(xfmt), len(res))
                rev = struct.unpack(xfmt, res)[0]
                if rev != arg: