Software Testing

The 3 A's (from Dr. Nile Wilson)

• Arrange / Assign - Build up the necessarily arguments that go the function like some mock data etc.
• Act - Use the functions on the arguments.
• Assert - Check if the results are as expected.

In Python's pytest package, @pytest.mark.parametrize can be used to test the same function multiple times. Also see =mocker.

To run the PDB to check test failures do the following - use u to go up the stack trace, at which point you can see the variables in the current scope at that point.

pytest test_script.py --pdb

Or using IPython.

ipython --pdb test_script.py