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Unit testing traning

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Diego Pacheco
Diego Pacheco

Unit testing traning

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Unit Testing Diego Pacheco
Too busy to improve our tests...
The culture we need... ❏ Tests allow SAFE Refactoring ❏ Tests are a SAFETY REQUIREMENT ❏ We should NEVER skip them ❏ We need to TRUST our tests, FLAKY tests are worse than NO TEST. ❏ We need stop the EXCUSES. ❏ Just do it.
Dimensional quality == Dimensional Tests
Testing == Economics
V MODEL
Testing is for everybody!
Discovery, MVP, Lean Startup, UX are about testing...
Testing Pyramid
Reality...
Level of testing... Mock Contract Stress Testing Chaos Testing Developer Testing
Developer Tests:: It's all about SPEED ❏ Faster discovery ❏ Faster validation ❏ Faster Debugging ❏ Faster Layouting ❏ It's a MUST !!!! ❏ Simplified “Service” ❏ Simple Main Class ❏ Debug tricks.
Mocked Contract ❏ How do we know we don't break the CONSUMERS? ❏ Frontend ❏ Mobile ❏ BFFs ❏ We should: ❏ Version ❏ Gast Regression props ❏ Know before the CONSUMERS any breaking change.
Stress Tests ❏ Stress | Load Testing ❏ How I know my bottlenecks? ❏ When the system breaks? Why it breaks? ❏ We need to play with: ❏ Sensitive Operations ❏ Number of concurrent users ❏ Load Patterns ❏ Best done via Gatling (https://gatling.io/)
Chaos Testing ❏ Software fails all the time. ❏ Hope is not a strategy ❏ Types of failure: ❏ Datacenter is down. ❏ AZ is down. ❏ Service is down ❏ Latency ❏ Burn: CPU, network, Disk. ❏ Bombos: Strings, JVM, volume... ❏ Best done via Netflix tools, linux and creativity
Testing beyond the happy path.... ❏ Null ❏ Invalid dates ❏ Special chars in Strings ❏ List corner cases ❏ Negative numbers ❏ Long ranges ❏ Wrong objects ❏ Think in scenarios before CODE.
Testing beyond the happy path.... ❏ Invalid Order ❏ Did you try exploratory ramon crazy tests? ❏ What if the dependencies are not there? ❏ How possible exceptions we might have? ❏ What if we it “works”...
Why is important to have COVERAGE GOALS ❏ Most Engineers don't lear TESTS on university ❏ Some companies still have QAs ❏ Developer need to understand that is his responsibility to ship STABLE CODE. ❏ CODE Revier Kanban queue policies +10 per class. ❏ XP BIG Visible charts on the WALL ❏ Feel the same of the lack of tests.
We will implement some Features for a BANK customer and we will create tons of TESTs and we will refactor the code. https://github.com/diegopacheco/unit-testing-training
Unit Testing Diego Pacheco

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Unit testing traning

  • 2.
  • 3.
  • 4. Too busy to improve our tests...
  • 5. The culture we need... ❏ Tests allow SAFE Refactoring ❏ Tests are a SAFETY REQUIREMENT ❏ We should NEVER skip them ❏ We need to TRUST our tests, FLAKY tests are worse than NO TEST. ❏ We need stop the EXCUSES. ❏ Just do it.
  • 6. Dimensional quality == Dimensional Tests
  • 7.
  • 10. Testing is for everybody!
  • 11. Discovery, MVP, Lean Startup, UX are about testing...
  • 14. Level of testing... Mock Contract Stress Testing Chaos Testing Developer Testing
  • 15. Developer Tests:: It's all about SPEED ❏ Faster discovery ❏ Faster validation ❏ Faster Debugging ❏ Faster Layouting ❏ It's a MUST !!!! ❏ Simplified “Service” ❏ Simple Main Class ❏ Debug tricks.
  • 16. Mocked Contract ❏ How do we know we don't break the CONSUMERS? ❏ Frontend ❏ Mobile ❏ BFFs ❏ We should: ❏ Version ❏ Gast Regression props ❏ Know before the CONSUMERS any breaking change.
  • 17. Stress Tests ❏ Stress | Load Testing ❏ How I know my bottlenecks? ❏ When the system breaks? Why it breaks? ❏ We need to play with: ❏ Sensitive Operations ❏ Number of concurrent users ❏ Load Patterns ❏ Best done via Gatling (https://gatling.io/)
  • 18. Chaos Testing ❏ Software fails all the time. ❏ Hope is not a strategy ❏ Types of failure: ❏ Datacenter is down. ❏ AZ is down. ❏ Service is down ❏ Latency ❏ Burn: CPU, network, Disk. ❏ Bombos: Strings, JVM, volume... ❏ Best done via Netflix tools, linux and creativity
  • 19. Testing beyond the happy path.... ❏ Null ❏ Invalid dates ❏ Special chars in Strings ❏ List corner cases ❏ Negative numbers ❏ Long ranges ❏ Wrong objects ❏ Think in scenarios before CODE.
  • 20. Testing beyond the happy path.... ❏ Invalid Order ❏ Did you try exploratory ramon crazy tests? ❏ What if the dependencies are not there? ❏ How possible exceptions we might have? ❏ What if we it “works”...
  • 21. Why is important to have COVERAGE GOALS ❏ Most Engineers don't lear TESTS on university ❏ Some companies still have QAs ❏ Developer need to understand that is his responsibility to ship STABLE CODE. ❏ CODE Revier Kanban queue policies +10 per class. ❏ XP BIG Visible charts on the WALL ❏ Feel the same of the lack of tests.
  • 22.
  • 23. We will implement some Features for a BANK customer and we will create tons of TESTs and we will refactor the code. https://github.com/diegopacheco/unit-testing-training