Method testMethods

Lib/test/test_file.py:98–130

(self)

        self.assertTrue(f.closed)

    def testMethods(self):
        methods = [('fileno', ()),
                   ('flush', ()),
                   ('isatty', ()),
                   ('__next__', ()),
                   ('read', ()),
                   ('write', (b"",)),
                   ('readline', ()),
                   ('readlines', ()),
                   ('seek', (0,)),
                   ('tell', ()),
                   ('write', (b"",)),
                   ('writelines', ([],)),
                   ('__iter__', ()),
                   ]
        methods.append(('truncate', ()))

        # __exit__ should close the file
        self.f.__exit__(None, None, None)
        self.assertTrue(self.f.closed)

        for methodname, args in methods:
            method = getattr(self.f, methodname)
            # should raise on closed file
            self.assertRaises(ValueError, method, *args)

        # file is closed, __exit__ shouldn't do anything
        self.assertEqual(self.f.__exit__(None, None, None), None)
        # it must also return None if an exception was given
        try:
            1/0
        except:
            self.assertEqual(self.f.__exit__(*sys.exc_info()), None)

    def testReadWhenWriting(self):
        self.assertRaises(OSError, self.f.read)