Unit Testing with Python

Running the unit tests

You can run the unit tests with the following command

python3 unit_tests.py

unit_tests.py imports the calculator that we created and the unittest module needed to set up and run the tests.

Add more unit tests

You should add more test cases to the unit_tests.py file. The general structure is to have a class that takes in the unittest module: class TestCalculator(unittest.TestCase). Then, add functions that test a specific part of the code written in calculator.py

Testing the class

In order to test a class in Python, you'll simply import it and then have a setup function which will create the object. In our case, we set self.a and self.b to two different numbers.

You should test for subtraction, division and multiplication.

Testing a function

There is also an addition function in calculator.py. This function takes in an list of items (currently, it does not check to see if they're numbers) and then returns the sum.

How Travis CI Works

Once you have created a project on GitHub, you will need to add a .travis.yml file which sets the configurations for Travis. For instance, what languages will you be using? Do you need a specific operating system? If something fails, should it email a certain address?

You also need to set the script that you'd like to run. This way, Travis will run the test files you specify and report any non-zero exit codes. Similar to how we run unit tests locally, you add python unit_tests.py to the scripts section of the .yaml file.

View Travis: https://travis-ci.org/aaronherman/python-unit-test/builds

More information

.travis.yml Overview