Lib/test/test_file.py

   1 import sys
   2 import os
   3 from array import array
   4
   5 from test_support import verify, TESTFN, TestFailed
   6 from UserList import UserList
   7
   8 # verify writelines with instance sequence
   9 l = UserList(['1', '2'])
  10 f = open(TESTFN, 'wb')
  11 f.writelines(l)
  12 f.close()
  13 f = open(TESTFN, 'rb')
  14 buf = f.read()
  15 f.close()
  16 verify(buf == '12')
  17
  18 # verify readinto
  19 a = array('c', 'x'*10)
  20 f = open(TESTFN, 'rb')
  21 n = f.readinto(a)
  22 f.close()
  23 verify(buf == a.tostring()[:n])
  24
  25 # verify writelines with integers
  26 f = open(TESTFN, 'wb')
  27 try:
  28     f.writelines([1, 2, 3])
  29 except TypeError:
  30     pass
  31 else:
  32     print "writelines accepted sequence of integers"
  33 f.close()
  34
  35 # verify writelines with integers in UserList
  36 f = open(TESTFN, 'wb')
  37 l = UserList([1,2,3])
  38 try:
  39     f.writelines(l)
  40 except TypeError:
  41     pass
  42 else:
  43     print "writelines accepted sequence of integers"
  44 f.close()
  45
  46 # verify writelines with non-string object
  47 class NonString: pass
  48
  49 f = open(TESTFN, 'wb')
  50 try:
  51     f.writelines([NonString(), NonString()])
  52 except TypeError:
  53     pass
  54 else:
  55     print "writelines accepted sequence of non-string objects"
  56 f.close()
  57
  58 # verify that we get a sensible error message for bad mode argument
  59 bad_mode = "qwerty"
  60 try:
  61     open(TESTFN, bad_mode)
  62 except IOError, msg:
  63     if msg[0] != 0:
  64         s = str(msg)
  65         if s.find(TESTFN) != -1 or s.find(bad_mode) == -1:
  66             print "bad error message for invalid mode: %s" % s
  67     # if msg[0] == 0, we're probably on Windows where there may be
  68     # no obvious way to discover why open() failed.
  69 else:
  70     print "no error for invalid mode: %s" % bad_mode
  71
  72 f = open(TESTFN)
  73 if f.name != TESTFN:
  74     raise TestFailed, 'file.name should be "%s"' % TESTFN
  75 if f.isatty():
  76     raise TestFailed, 'file.isatty() should be false'
  77
  78 if f.closed:
  79     raise TestFailed, 'file.closed should be false'
  80
  81 try:
  82     f.readinto("")
  83 except TypeError:
  84     pass
  85 else:
  86     raise TestFailed, 'file.readinto("") should raise a TypeError'
  87
  88 f.close()
  89 if not f.closed:
  90     raise TestFailed, 'file.closed should be true'
  91
  92 methods = ['fileno', 'flush', 'isatty', 'read', 'readinto', 'readline', 'readlines', 'seek', 'tell', 'truncate', 'write', 'xreadlines' ]
  93 if sys.platform.startswith('atheos'):
  94     methods.remove('truncate')
  95
  96 for methodname in methods:
  97     method = getattr(f, methodname)
  98     try:
  99         method()
 100     except ValueError:
 101         pass
 102     else:
 103         raise TestFailed, 'file.%s() on a closed file should raise a ValueError' % methodname
 104
 105 try:
 106     f.writelines([])
 107 except ValueError:
 108     pass
 109 else:
 110     raise TestFailed, 'file.writelines([]) on a closed file should raise a ValueError'
 111
 112 os.unlink(TESTFN)