| 634 | self.assertEqual(cm.filename, __file__) |
| 635 | |
| 636 | def testBadModeArgument(self): |
| 637 | # verify that we get a sensible error message for bad mode argument |
| 638 | bad_mode = "qwerty" |
| 639 | try: |
| 640 | f = self.FileIO(TESTFN, bad_mode) |
| 641 | except ValueError as msg: |
| 642 | if msg.args[0] != 0: |
| 643 | s = str(msg) |
| 644 | if TESTFN in s or bad_mode not in s: |
| 645 | self.fail("bad error message for invalid mode: %s" % s) |
| 646 | # if msg.args[0] == 0, we're probably on Windows where there may be |
| 647 | # no obvious way to discover why open() failed. |
| 648 | else: |
| 649 | f.close() |
| 650 | self.fail("no error for invalid mode: %s" % bad_mode) |
| 651 | |
| 652 | def testTruncate(self): |
| 653 | f = self.FileIO(TESTFN, 'w') |