Lib/test/test_marshal.py

   1 from test.test_support import TestFailed
   2 import marshal
   3 import sys
   4
   5 # XXX Much more needed here.
   6
   7 # Test the full range of Python ints.
   8 n = sys.maxint
   9 while n:
  10     for expected in (-n, n):
  11         s = marshal.dumps(expected)
  12         got = marshal.loads(s)
  13         if expected != got:
  14             raise TestFailed("for int %d, marshal string is %r, loaded "
  15                              "back as %d" % (expected, s, got))
  16     n = n >> 1
  17
  18 # Simulate int marshaling on a 64-bit box.  This is most interesting if
  19 # we're running the test on a 32-bit box, of course.
  20
  21 def to_little_endian_string(value, nbytes):
  22     bytes = []
  23     for i in range(nbytes):
  24         bytes.append(chr(value & 0xff))
  25         value >>= 8
  26     return ''.join(bytes)
  27
  28 maxint64 = (1L << 63) - 1
  29 minint64 = -maxint64-1
  30
  31 for base in maxint64, minint64, -maxint64, -(minint64 >> 1):
  32     while base:
  33         s = 'I' + to_little_endian_string(base, 8)
  34         got = marshal.loads(s)
  35         if base != got:
  36             raise TestFailed("for int %d, simulated marshal string is %r, "
  37                              "loaded back as %d" % (base, s, got))
  38         if base == -1:  # a fixed-point for shifting right 1
  39             base = 0
  40         else:
  41             base >>= 1
  42
  43 # Simple-minded check for SF 588452: Debug build crashes
  44 marshal.dumps([128] * 1000)