def METHOD_NAME(self):
    file1 = os.path.join(autoconfig.data_directory, 'decl_cache_file1.txt')
    file1_dup = os.path.join(
        autoconfig.data_directory,
        'decl_cache_file1_duplicate.txt')
    file2 = os.path.join(autoconfig.data_directory, 'decl_cache_file2.txt')
    sig1 = declarations_cache.file_signature(file1)
    sig1_dup = declarations_cache.file_signature(file1_dup)
    sig2 = declarations_cache.file_signature(file2)
    self.assertTrue(sig1 == sig1_dup)
    self.assertTrue(sig1 != sig2)