在这些情况下，我会使用多重继承。例如：
import os
class CustomAssertions:
def assertFileExists(self, path):
if not os.path.lexists(path):
raise AssertionError('File not exists in path "' + path + '".')
现在，我定义一个从unittest.TestCase和CustomAssertion继承的类
import unittest
class MyTest(unittest.TestCase, CustomAssertions):
def test_file_exists(self):
self.assertFileExists('any/file/path')
if __name__ == '__main__':
unittest.main()
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