JS Software testing for beginners

Transcript

1. Software testing with JavaScript_ a quick guide
2. who am I_ {twitter, youtube, linkedin…}.lsantos.dev software engineer_ hello@lsantos.dev
3. software testing
4. software tests are untested software that tests your software
5. why?
6. why automated testing? ➔ Improves software quality ➔ Prevent errors before they're published ➔ Builds trust in the codebase ◆ Changes can be published faster
7. tests should be ➔ Deterministic ➔ Self-contained ➔ Predictable ➔ Small
8. What to test?
9. Functionality
10. What not to test?
11. Implementation
12. let's hack!
13. test runners_ giving us an edge on tests
14. let's hack!
15. test doubles_
16. Types of doubles ➔ Spies ◆ Adds instrumentation to a function/object ◆ Actually calls the function but gathers metadata ➔ Stubs ◆ Replaces a function for a fake implementation ◆ Adds instrumentation ◆ Returns a fixed value ➔ Mocks ◆ "Smarter" stubs ◆ Have predefined expectations on interactions ◆ Focused on the interaction, not on behaviour
17. let's hack!
18. TDD Test Driven Development
20. thank you_ lsantos.dev