21 def remove_if_exists(filename):  argument
22     if os.path.exists(filename):
23         os.unlink(filename)
29     # Do all the tests we can given only a single filename.  The file should
31     def _do_single(self, filename):  argument
32         self.assertTrue(os.path.exists(filename))
33         self.assertTrue(os.path.isfile(filename))
34         self.assertTrue(os.access(filename, os.R_OK))
35         self.assertTrue(os.path.exists(os.path.abspath(filename)))
36         self.assertTrue(os.path.isfile(os.path.abspath(filename)))
37         self.assertTrue(os.access(os.path.abspath(filename), os.R_OK))
38         os.chmod(filename, 0o777)
39         os.utime(filename, None)
40         os.utime(filename, (time.time(), time.time()))
41         # Copy/rename etc tests using the same filename
42         self._do_copyish(filename, filename)
43         # Filename should appear in glob output
45             os.path.abspath(filename)==os.path.abspath(glob.glob(glob.escape(filename))[0]))
47         path, base = os.path.split(os.path.abspath(filename))
104     def _test_single(self, filename):  argument
105         remove_if_exists(filename)
106         create_empty_file(filename)
108             self._do_single(filename)
110             os.unlink(filename)
111         self.assertTrue(not os.path.exists(filename))
113         f = os.open(filename, os.O_CREAT | os.O_WRONLY)
116             self._do_single(filename)
118             os.unlink(filename)
121     # _test functions with each of the filename combinations we wish to test