Developers want to be sure the code they write is good quality and does the right thing. In this course, Testing in Python 3, you’ll learn to write unit tests in popular frameworks like unittest and pytest. First, you’ll explore the basic ideas and vocabulary of unit testing with the built-in package unittest and the popular tool pytest. Next, you’ll discover how to use test doubles to isolate your units. Finally, you’ll learn how to use more advanced testing techniques like approval testing and parameterized tests. When you’re finished with this course, you’ll have the skills and knowledge of writing the automated tests needed to ensure your code does what you think it does and has a reliable suite of regression tests to support future development.