Test driven development (TDD) is a software development process where test cases are written before code is produced. TDD follows a cycle of writing a test, seeing it fail, writing code to pass the test, and refactoring code as needed. The tests provide feedback and ensure new code does not break existing functionality through regression testing. TDD encourages writing small, focused test cases with clear pass/fail outcomes to gradually build up the system through a red-green-refactor cycle.

1. TEST DRIVEN DEVELOPMENT
Hercules Lemke Merscher - @hlmerscher

2. O que é?
http://i-love-my-life.com/wp-content/uploads/2011/03/doubt.jpg

3. TÉCNICA
https://media.licdn.com/mpr/mpr/shrinknp_800_800/AAEAAQAAAAAAAASQAAAAJDllYzc1ZjgxLTliNDQtNGU2MS1hNDg0LTFiOWZlNTQ4N2Q5ZA.png

4. TDD E TESTE AUTOMATIZADO. SINÔNIMOS?
https://images.rapgenius.com/e7c0c514d4e7564079c2e6b0c8d547b5.540x350x1.jpg

5. POR QUÊ?
https://imgflip.com/s/meme/Question-Rage-Face.jpg

6. ERROS RECORRENTES
https://upload.wikimedia.org/wikipedia/commons/3/3b/Windows_9X_BSOD.png

7. O COMPUTADOR É MAIS RÁPIDO http://www.seuseriado.com/wp-content/uploads/2016/04/The-Flash-2ª-Temporada.jpg

8. O COMPUTADOR NÃO CANSA
http://2.bp.blogspot.com/-mF5paUPo6tQ/UkeaGETMkWI/AAAAAAAAAYA/L6AnHHKP8uc/s1600/52636309+(1).png

9. LEI DE MURPHY
http://shedka.com/wp-content/uploads/2015/06/tostada-1000x666.jpg

10. BUG’S EM PRODUÇÃO
http://www.dan-dare.org/FreeFun/Images/CartoonsMoviesTV/BugsLifeWallpaper800.jpg

11. MEDO DE TOCAR NO CÓDIGO
https://councillorpadraigmcshane.files.wordpress.com/2012/11/scooby-and-shaggy-afraid-scooby-doo-2992126-852-480.jpg

12. CORREÇÕES QUE GERAM MAIS BUG’S
http://web.pdx.edu/~cem3/looney/img/coyoterocket.png

13. http://iblasquez.github.io/presentation_TDD_CodingDojo/TDD_Mantra.png

14. VERMELHO
http://static.maciverinstitute.com/F%20Letter%20Grade-cropped-proto-custom_4-thumb-618xauto-7419.jpg

15. VERDE
https://www.exceptionnotfound.net/content/images/2015/04/the-coder.jpg

16. REFATORA
http://cdn.hitfix.com/photos/6214402/HannibalLecterSOTL.jpg

17. E A PARTE DO CÓDIGO, JÁ CHEGOU?
https://i.ytimg.com/vi/ovm2zkuqJD8/maxresdefault.jpg

18. PRIMEEEIIIIROOOO...
ESCREVA O TESTE
http://2.bp.blogspot.com/-S8U-dF2WTzk/UlLk0q5jy4I/AAAAAAAAC4M/OFlBxMqwCYA/s1600/mask.jpg

19. TESTE
test('Product instantiates a new product', (t) => {
let product = new Product();
t.ok(product instanceof Product);
t.end();
});

20. TESTE FALHA
ReferenceError: Product is not defined

21. CÓDIGO
function Product() {
}

22. TESTE PASSA
# Product instantiates a new product
ok 1 should be truthy
1..1
# tests 1
# pass 1
# ok

23. BABY STEPS
http://www.clipartkid.com/images/300/download-baby-steps-clipart-LA7TaY-
clipart.jpg

24. TESTE
test('Product#price zero by default', (t) => {
let product = new Product();
t.equal(product.price, 0);
t.end();
});

25. TESTE FALHA
# Product#price zero by default
not ok 2 should be equal
---
operator: equal
expected: 0
actual: undefined

26. CÓDIGO
function Product() {
this.price = 0;
}

27. TESTE PASSA
# Product#price zero by default
ok 2 should be equal
1..2
# tests 2
# pass 2
# ok

28. TESTE
test('Product#quantity zero by default', (t) => {
let product = new Product();
t.equal(product.quantity, 0);
t.end();
});

29. TESTE FALHA
# Product#quantity zero by default
not ok 3 should be equal
---
operator: equal
expected: 0
actual: undefined

30. CÓDIGO
function Product() {
this.price = 0;
this.quantity = 0;
}

31. TESTE PASSA
# Product#quantity zero by default
ok 3 should be equal
1..3
# tests 3
# pass 3
# ok

32. TESTE
test('Product#total calculates amount', (t) => {
let product = Object.assign(
new Product(), { price: 10, quantity: 2 });
t.equal(product.total(), 20);
t.end();
});

33. TESTE FALHA
t.equal(product.total(), 20);
^
TypeError: product.total is not a function

34. CÓDIGO
function Product() {
this.price = 0;
this.quantity = 0;
this.total = () => this.price * this.quantity;
}

35. TESTE PASSA
# Product#total calculates amount
ok 4 should be equal
1..4
# tests 4
# pass 4
# ok

36. COM TDD EU AGARANTCHÍU !!!
https://img.buzzfeed.com/buzzfeed-static/static/2015-03/3/10/enhanced/webdr14/enhanced-buzz-29154-1425395469-14.jpg

37. TDD É SOBRE FEEDBACK
http://www.sacadasdecarreira.com.br/files/2015/12/design-feedback-tips.png

38. TESTE UNITÁRIO
http://unity-coding.slashgames.org/wp-content/uploads/unit-test.jpg

39. TESTE DE REGRESSÃO
https://d.ibtimes.co.uk/en/full/1396036/delorean.jp

40. TESTE DE INTEGRAÇÃO
http://mlb-s1-p.mlstatic.com/15139-MLB20096270752_052014-O.jpg

41. TESTE DE ACEITAÇÃO
http://aaronacceptance.ca/wp-content/uploads/2015/07/Loan-Approval_Aaron_Acceptance_256.png

42. MOCKS, STUBS E FAKES
http://goias24horas.com.br/wp-content/uploads/2013/08/marionete.jpg

43. CÓDIGO DIFÍCIL
DE TESTAR
É UM MAU SINAL?

44. QUANTAS
ASSERTIVAS
POR TESTE?

45. DEVO USAR
PASSOS DE BEBÊ
SEMPRE?

46. PRECISO
DA APROVAÇÃO DO MEU
CHEFE PARA
ESCREVER TESTES?
http://cdn.business2community.com/wp-content/uploads/2016/01/Godfather-300x169-3.png-3.png

47. COBERTURA

48. COBERTURA
https://github.com/hlmerscher/dojo-onde

49. http://www.maonamassasalgadosecia.com.br/uploads/widget/image/512/170/51217096/mao-na-massa.png

50. REFERÊNCIAS

51. OBRIGADO!
www.herculesdev.com.br