Python Testing with pytest

Chapter 5Parametrization

In the last couple of chapters, we looked at custom and builtin fixtures. In this chapter, we return to test functions. We’ll look at how to turn one test function into many test cases to test more thoroughly with less work. We’ll do this with parametrization.

Parametrized testing refers to adding parameters to our test functions and passing in multiple sets of arguments to the test to create new test cases. We’ll look at three ways to implement parametrized testing in pytest in the order in which they should be selected:

• Parametrizing functions
• Parametrizing fixtures
• Using a hook function called pytest_generate_tests

We’ll compare them side by side by solving the same parametrization problem using all three methods; however, ...