Python TTD Testing

Created on the 6th of June 2020

TTD - Test driven development

Test our code before pushing it to production is vital and is the main reason for TTD

Initially you go to the terminal and install the needed modules:
pip install pytest

pip install unittest2

A test will be recognised by the pytest module if it has the _test after its name.

• For example calc_test.py is a unit test file.

We are currently trying to fail the test so we can follow the technique of:

• TEST
• PASS or FAIL
• REFACTOR

The test will be run and either return a pass or fail. To learn we backwards engineered the tests and made them fail initially, then we went ahead and added the required functionality in the calculator to get the tests to pass one by one. This was to demonstrate the unit testing life cycle, it is the ability to develop, test, fail, refactor and repeat until the test returns a pass.

 def test_add(self):
        self.assertEqual(self.simple_calc.add(2, 2), 4)

This here tests whether the calculator method add is working correctly to take in the values 2, 2 and expects an output of 4.

Exercise Set on 07/07/2020 Create a test file for FILE
Test file can be found TEST_FILE