SLOG 8

This week is about testing. It is a really tough and complicated, and I am still very confused about it so that I cannot tell too much on it.

To start with testing, we have to know the reason we test. We test because we don’t know if our codes are running as we expected. So we have to input the expected results and see if it is same as the real answer.

To explain it better, I will make a general example, or we can call it the model.

Firstly, we write ‘ import unittest’ on the top.

Then we create a class, for instance, class TEST, with (unittest.Testcase) after it.

Then we write method.

The first method will be   def setup(self). In this function, all the codes will be operated before every testcase starts. We can initialize all the classed and variables here, and to access in other methods, all the initialized data are supposed to start with self., or be global variables.

The second method should be   def tearDown(self).   Similarly, all codes in this function will be operated before the every testcase starts, but the difference is, they will also be operated after the testcase stops. Since in the testcase, the variables starts with self. that we defined or other global variables will probably be modified by testcase for testing the results, we use tearDown function to make them nothing( self.blahblah = None), like throwing trash.

Finally, we write the key part of the test. We need a method called def test_test_case_name(self), which is allowed to be named by ourselves. Under this method, we need to write four lines of code: Actual = ______, which is the content we test

                               Expected = _______, which is the result we expected

                               Error = _____, which is a hint to let us know that there is an error

                               assert actual == expected, error  # maybe >= or <=

Above are my thoughts about test, maybe now it is still childish, but I will try to learn it

better.