Python library ‘unittest’: Generate multiple tests programmatically [duplicate]

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I had to do something similar. I created simple TestCase subclasses that took a value in their __init__, like this:

class KnownGood(unittest.TestCase):
    def __init__(self, input, output):
        super(KnownGood, self).__init__()
        self.input = input
        self.output = output
    def runTest(self):
        self.assertEqual(function_to_test(self.input), self.output)

I then made a test suite with these values:

def suite():
    suite = unittest.TestSuite()
    suite.addTests(KnownGood(input, output) for input, output in known_values)
    return suite

You can then run it from your main method:

if __name__ == '__main__':
    unittest.TextTestRunner().run(suite())

The advantages of this are:

  • As you add more values, the number of reported tests increases, which makes you feel like you are doing more.
  • Each individual test case can fail individually
  • It’s conceptually simple, since each input/output value is converted into one TestCase

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