def METHOD_NAME(self):
    f1 = FileData('file1', 'path/to/file1')
    f2 = FileData('file2', 'path/to/file2')
    self.layer.add_file(f1)
    self.layer.add_file(f2)
    file_paths = self.layer.get_file_paths()
    self.assertEqual(file_paths, ['path/to/file1', 'path/to/file2'])