Building a testing culture

Transcript

1. TESTING building CULTURE
2. https://ordepdev.me/posts/test-driven-developers
3. THIS IS NOT ABOUT TDD!
4. @ordepdev
5. First of all Why testing?
6. “It’s time for software developers to take up the mantle of responsibility for what they produce.
7. Testing is the engineering rigour of software development.
8. Responsibility — the state or fact of being accountable or to blame for something.
9. Rigour — the quality of being extremely thorough and careful.
10. Software Engineering
11. An engineering discipline that is concerned with all aspects of software production.
12. MUCH MORE THAN CODING!
13. Types of Bad Software Projects
14. 1. Without tests.
15. Zero Automated Tests.
16. ZERO!
17. Lack of professionalism?
18. Lack of skills?
19. Lack of knowledge?
20. Lack of time to test?
21. It can be all of them.
22. What about software quality?
23. Relax, we test all features with manual testing.
25. 2. With Wrongly Designed Tests..
26. Testing is HARD.
27. https://twitter.com/codepipes/status/987934900111138816
28. Testing pitfalls: coupling.
29. Implementation Boundary Testing Boundary
30. Implementation Boundary Testing Boundary ✅ ✅ ✅ ✅ ✅ ✅ ✅ ✅ ❌ ❌
31. Uncertainty and Doubt.
32. Implementation Boundary Testing Boundary ✅ ✅ ✅ ✅ ✅ ❌ ❌ ❌ ❌ ❌
33. Testing pitfalls: performance.
34. Taking too much time? — that’s a no run.
35. Types of Testing
36. 1. Testing after the implementation.
37. 2. Testing during the implementation.
38. 3. Testing that reproduce bugs.
39. It’s our job to build a testing culture!
40. But how?
41. 5 rules.
42. 1. Every change must have tests.
43. 50 100 150 200 Development Unit Tests Functional Tests System Tests Production The cost of bugs
44. Bugs in production are embarrassing and costly.
45. 2. Write more than unit tests.
46. https://twitter.com/pwlporto/status/999258562370170880
47. We do not know how much an increase in coverage can decrease the number of defects.” “
48. https://ordepdev.me/posts/code-coverage
49. Mutation testing!
50. def add(x,y) x + y end def add(x,y) x - y end Source Code Mutation
51. Property-based testing! https://hypothesis.works/articles/quickcheck-in-every-language
52. http://blog.jessitron.com/2013/04/property-based-testing-what-is-it.html
53. Contract testing! https://martinfowler.com/bliki/ContractTest.html
54. https://ordepdev.me/posts/boost-your-confidence-with-consumer-driven-contracts
55. Model-based testing! http://mit.bme.hu/~micskeiz/pages/modelbased_testing.html
56. Instead of writing hundreds of test cases, write an abstract model of the system and generate a set of test cases.” “
58. Formal methods! https://www.infoq.com/presentations/aws-testing-tla
59. Formal methods use mathematical proof as a complement to system testing in order to ensure correct behavior.” “
60. 3. Bug fixing must have tests.
61. Don’t repeat the same bug hunting — write a test!
62. 4. Testing code must be reviewed.
63. A well-designed test suite is much easier to read, understand and evolve.
64. Testing code is production code!
65. 5. Test suites must be consistent.
66. L12. assertEquals(input, expectation); L35. assertEquals(expectation, input); L43. assertThat(input).isEqualTo( expectation); Assertions
67. L12. assertEquals(input, expectation); L35. assertEquals(expectation, input); L43. assertThat(input).isEqualTo( expectation); Assertions
68. L12. createEntity L35. create_withValidPayload_success L43. create_withValidPayload_shouldPersistEntity Test Methods
69. L12. createEntity L35. create_withValidPayload_success L43. create_withValidPayload_shouldPersistEntity Test Methods
70. We must share the same values, practices, and tools.
71. Enforce them through code reviews, static analysis, and style checking tools.
72. 5+1.Test suites must be visible.
73. A failed test is a failed build!
74. Wrapping up.
75. People who are successful at automating tasks tend to work this way in every aspect of their jobs. It is just how they work; it is part of their culture. “ ”
76. Manual work is a bug. acmqueue | january-february 2018
77. ALWAYS BE AUTOMATING!
78. GO AND FIX YOUR BROKEN CULTURE!
79. TESTING building CULTURE @ordepdev ordepdev.me Thanks!