In this episode we discuss the aspects of unit testing:

1. Types of changes in code: structural and behavioural
2. Fast tests make you fast
3. Learning Tests
4. Broken console.log
5. Single asserts in tests
6. Tests and code handover.
7. Why trust tests?
8. Slow tests, leaving process boundaries and unpredictability in tests.
9. What are: test doubles, mocks, dummies, stubs, spies and fakes?
10. To mock or not to mock.