Week 10

Last week, we have start to talk little about Unitest. In CSC108, we have learned about test cases. In this topic, we need to check for out outputs meet our expectations in respond to some particular input.

It's very common, that an incorrect code pass our doc test, or even most of the cases that we think about. Therefore, we need to design a good set of tests. One of the common method is assertEqual,
it's a boolean function that takes two arguments (usually one is real output, and another is out expected result) and comparing two arguments to see if they are equal or not; and gives us True or False.

To implement unitest, first, we import unitest, then we define a function that we want it to be tested. Then we need to a class MyTest(unittest.TestCase), and def test(self), finally, self.assertEqual(function(input), expected output).

Doc test is easier, we only need to if __name__ == '__main__': import doctest doctest.testmod()

Some others things we should know

(1) Setup(): This is called at the beginning of the test. It's different than AssertionError, which later one is raise when an assert statement fails while Setup()  gives us error rather than test failure when exception raise.

(2) Teardown(): It's called after the test had been implemented regardless whether the test method raises exception