Mocks, Stubs, Fakes, Dummies and Spies

Learn to makr your tests easier, fast and lean using mocks, stubs, fakes, dummies and spies.

Aprenda a tornar seus testes mais simples, rápidos e enxutos com a utilização de mocks, stubs, fakes, dummies e spies.

Palestra apresentada em 8/04/17 no Agile Testers Conference RJ http://conferencia.agiletesters.com.br/riodejaneiro.html

Transcript

1. Mocks, Stubs, Fakes Dummies and Spies Raphael Almeida
2. Who Am I? Raphael Almeida Developer since 2006 Co-founder of PHPRio, DojoRio, RubyOnRio … Community-a-holic
3. Double Objects Type of Verifications Best Practices
4. Double Objects: Simplist test
5. Double Objects: Awkward test
6. Double Objects: Types Dummies Fakes Stubs Spies Mocks
7. Dummies Used whenever we need to pass irrelevant or never used arguments only to respect the method signature
8. Dummies
9. Fakes Simplified implementation of a real method
10. Fakes
11. Stubs Provide canned responses to calls made during the test
12. Stubs
13. Spies Stubs that also record some information based on how they were called
14. Spies
15. Mocks Pre-programmed objects with expectations which form a specification of the calls they are expected to receive
16. Mocks
17. Double Objects Type of Verifications Best Practices
18. Types of Verifications State or Behaviour
19. Verifying State We inspect the state of the tested object after it has been exercised and compare it to the expected state
20. Verifying Behaviour We capture the indirect output of the tested object as they occur and compare them to the expected behavior
21. Double Objects Type of Verifications Best Practices
22. Best Practices Don’t mock values Verify the context (easy or awkward) Use Fixtures with parsimony Coupling test to implementations
23. References https://martinfowler.com/articles/mocksArentStubs.html https://github.com/padraic/mockery https://github.com/php-vcr/php-vcr XUnit Test Patterns - Gerard Meszaros
24. Thank you Raphael Almeida @raph_almeida