'Most tests are actually performed in test_copy_filecontent_mutant, but
I want to make sure I can copy with OnlyTokenFilesMultipartContainer too'

def test_copy_filecontent_mutant_only_file_token(self):

    m = self.create_simple_filecontent_mutant(OnlyTokenFilesMultipartContainer)
    mcopy = m.copy()
    self.assertIsInstance(mcopy, FileContentMutant)
