simple python unit test sample,TDD rule

import unittest
class TestTank(unittest.TestCase):
        def testImage(self):
                tank="boo"
                assert tank != "boo", "tank image is None"
        def test1(self):
                tank ="moo"
                assert tank != "moo", "test1 tank image is None"


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

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