def METHOD_NAME(self):
    test_cases = [
        None, 123, 12.3, '', os.path.join('some', 'path', 'to', 'folder')
    ]
    for nzb_dir in test_cases:
        app.NZB_DIR = nzb_dir
        self.assertEqual(NZBProvider('Test Provider')._get_storage_dir(), nzb_dir)