IntroductionWhat is testing?Why (else) do we test?When to run tests?When to write tests?

---

Working with Legacy CodeMeet the legacy code projectA simple end-to-end test

---

Test frameworkpytest: A test frameworkWhat is code (test) coverage

---

Test Driven DevelopmentTest Driven Development

---

Figure 1

Image 1 of 1: ‘Cycle with three nodes: 'Red (write a failing test)', followed by 'Green (write just enough code to pass the test)', followed by 'Refactor (improve the code with tests intact)', then back to Red’

Red-Green-Refactor cycle, liberally borrowed from a blog at https://khalilstemmler.com/

---

Refactoring for TestingMonolithic main functionsSafe Refactoring and TDD

---

Testing Big ChangesMaking big changes

---