Python unittest.TestCase object has no attribute 'runTest'

Question

For the following code:

import unittest

class Test(unittest.TestCase):
    def test1(self):
        assert(True == True)

if __name__ == "__main__":
    suite = unittest.TestSuite()
    suite.addTest(Test())
    unittest.TextTestRunner().run(suite)

Using Python 3 to execute it, the following error is raised:

Traceback (most recent call last):
  File "test.py", line 10, in <module>
    unittest.TextTestRunner().run(suite)
  File "/usr/lib/python3.2/unittest/runner.py", line 168, in run
    test(result)
  File "/usr/lib/python3.2/unittest/suite.py", line 67, in __call__
    return self.run(*args, **kwds)
  File "/usr/lib/python3.2/unittest/suite.py", line 105, in run
    test(result)
  File "/usr/lib/python3.2/unittest/case.py", line 477, in __call__
    return self.run(*args, **kwds)
  File "/usr/lib/python3.2/unittest/case.py", line 408, in run
    testMethod = getattr(self, self._testMethodName)
AttributeError: 'Test' object has no attribute 'runTest'

But unittest.main() works.

Duplication

Answer 1

You need to invoke a TestLoader:

if __name__ == "__main__":
    suite = unittest.defaultTestLoader.loadTestsFromTestCase(Test)
    unittest.TextTestRunner().run(suite)

Licit

Answer 2

You have to specify the test method name (test1):

import unittest

class Test(unittest.TestCase):
    def test1(self):
        assert(True == True)

if __name__ == "__main__":
    suite = unittest.TestSuite()
    suite.addTest(Test('test1')) # <----------------
    unittest.TextTestRunner().run(suite)

Or, if you want to run all tests in the file, Just calling unittest.main() is enough:

if __name__ == "__main__":
    unittest.main()

Ruben

Answer 3

Adding to the answer of Janne:

If the tests included in several TestCase classes need to be run, addTests() will do:

suite = unittest.TestSuite()
suite.addTests(unittest.defaultTestLoader.loadTestsFromTestCase(TestCase1)))
suite.addTests(unittest.defaultTestLoader.loadTestsFromTestCase(TestCase2)))

Communize

Answer 4

The actual test for any TestCase subclass is performed in the runTest() method. Simply change your code to:

class Test(unittest.TestCase):
    def runTest(self):
        assert(True == True)

Heterogamete

Yes, it works. But is there a way to make it work without changing the Test class? @bhajun-singh. – Duplication

Just say pass instead of assert(True == True) – Seismism

This documentation seems to say otherwise. To wit: "Each instance of TestCase will run a single base method: the method named methodName. In most uses of TestCase, you will neither change the methodName nor reimplement the default runTest() method." – Yorkshire

Answer 5

You can run it like this:

python -m unittest <your-module-name>

I don't fully understand why it works though.

Matronage