def METHOD_NAME(self):
    storage = FiletrackerStorage(prefix='/foo', client=DummyClient())
    field = FileField(storage=storage)
    value = FieldFile(None, field, 'bar')
    self.assertEqual(django_to_filetracker_path(value), '/foo/bar')
    with self.assertRaises(ValueError):
        django_to_filetracker_path(ContentFile('whatever', name='gizmo'))
    self.assertEqual(
        '/foo/bar',
        django_to_filetracker_path(
            filetracker_to_django_file('/foo/bar', storage=storage)
        ),
    )