Refactoring developer habits

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We are creatures of habit, and our habits, good or not drive us to achieve results we aim for. This presentation walks you through how 13 Good Habits of TDD programming have evolved into a refined list of such habits. And when a group of talented craftsmen look at them again, take it to a newer level

@theNeomatrix369 @pedromsantos
Refactoring
Developer
Habits

@theNeomatrix369 @pedromsantos
We are creatures of habit...

@theNeomatrix369 @pedromsantos
..our habits influence our
actions greatly...

@theNeomatrix369 @pedromsantos
Know and accept your
good habits !

@theNeomatrix369 @pedromsantos
Know and accept your
bad habits !

@theNeomatrix369 @pedromsantos
Developer habits is a
very broad subject

@theNeomatrix369 @pedromsantos
But we need to start
somewhere

@theNeomatrix369 @pedromsantos
The TDD life-cycle

@theNeomatrix369 @pedromsantos
Let’s fit it into the TDD cycle
Red-Green-Refactor cycle

@theNeomatrix369 @pedromsantos
The TDD cycle
⇐ apply habits...
Red phase
⇐ apply habits...
Green phase
⇐ apply habits...
Refactor phase
⇐ apply habits...

@theNeomatrix369 @pedromsantos
Refactoring
Developer
Habits:
birth of the #TDD
#manifesto

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Original version

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Socrates UK 2013

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Refining: after discussion 1

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Refining: after discussion 2

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https://neomatrix369.wordpress.com/2013/09/27
Blog post - Socrates UK 2013

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Just before Socrates UK
2016, Pedro and Mani...

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Repeat the same exercise

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What should stay?

@theNeomatrix369 @pedromsantos
What should be removed?

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What should be added?

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Should the flow be
improved?

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Give more or less
importance to any item?

@theNeomatrix369 @pedromsantos
15-20 minutes
group discussion

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Results of the discussions

@theNeomatrix369 @pedromsantos
Shared with the community
Github: http://bit.ly/1tjLS7l

@theNeomatrix369 @pedromsantos
Principles
- tests should test one thing only
- test one logical assertion
- don't mix assertions of state and collaboration in the same test
- modifications of production code should only break related test cases
- each test should be self-contained, including data
- ensure tests are independent of each other
- don't refactor with a failing test
- organise your unit test projects to reflect your production code
- keep your tests and production code separate
- do not use production data and code to test production code
- if your tests are difficult to write or maintain, consider changing the design

@theNeomatrix369 @pedromsantos
Red phase
- create more specific tests to drive a more generic solution (Triangulate)
- give your tests meaningful names (behaviour / goal-oriented) that reflect your
production system
- write the assertion first and work backwards
- see the test fail for the right reason
- ensure you have meaningful feedback from failing tests

@theNeomatrix369 @pedromsantos
Green phase
- write the simplest code to pass the test
- write any code that makes you get to the refactor phase quicker
- it is okay to write any code that you might improve at a later stage

@theNeomatrix369 @pedromsantos
Refactor phase
- refactor aggressively and constantly
- treat tests as first class code
- use the IDE to refactor quickly and safely
- refactor production and test code independently (except changing public
interfaces)

@theNeomatrix369 @pedromsantos
Captured as a mind-map

@theNeomatrix369 @pedromsantos
Does TDD lead to good design?
Find out...
http://codurance.com/2015/05/12/does-tdd-lead-to-good-design/

@theNeomatrix369 @pedromsantos
Discuss with the community
http://SoftwareCraftsmanship.slack.com
channel: #tdd

@theNeomatrix369 @pedromsantos
Big “thank you” to
the first contributors
http://bit.ly/235Ub3a

@theNeomatrix369 @pedromsantos
Q&A
Feedback

@theNeomatrix369 @pedromsantos
Thanks to @jasongorman for
sharing the original list

@theNeomatrix369 @pedromsantos
Thank you!

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Refactoring developer habits

1. @theNeomatrix369 @pedromsantos Refactoring Developer Habits

2. @theNeomatrix369 @pedromsantos We are creatures of habit...

3. @theNeomatrix369 @pedromsantos ..our habits influence our actions greatly...

4. @theNeomatrix369 @pedromsantos Know and accept your good habits !

5. @theNeomatrix369 @pedromsantos Know and accept your bad habits !

6. @theNeomatrix369 @pedromsantos Developer habits is a very broad subject

7. @theNeomatrix369 @pedromsantos But we need to start somewhere

8. @theNeomatrix369 @pedromsantos The TDD life-cycle

9. @theNeomatrix369 @pedromsantos Let’s fit it into the TDD cycle Red-Green-Refactor cycle

10. @theNeomatrix369 @pedromsantos The TDD cycle ⇐ apply habits... Red phase ⇐ apply habits... Green phase ⇐ apply habits... Refactor phase ⇐ apply habits...

11. @theNeomatrix369 @pedromsantos Refactoring Developer Habits: birth of the #TDD #manifesto

12. @theNeomatrix369 @pedromsantos Original version

13. @theNeomatrix369 @pedromsantos Socrates UK 2013

14. @theNeomatrix369 @pedromsantos Refining: after discussion 1

15. @theNeomatrix369 @pedromsantos Refining: after discussion 2

16. @theNeomatrix369 @pedromsantos https://neomatrix369.wordpress.com/2013/09/27 Blog post - Socrates UK 2013

17. @theNeomatrix369 @pedromsantos Just before Socrates UK 2016, Pedro and Mani...

18. @theNeomatrix369 @pedromsantos Repeat the same exercise

19. @theNeomatrix369 @pedromsantos What should stay?

20. @theNeomatrix369 @pedromsantos What should be removed?

21. @theNeomatrix369 @pedromsantos What should be added?

22. @theNeomatrix369 @pedromsantos Should the flow be improved?

23. @theNeomatrix369 @pedromsantos Give more or less importance to any item?

24. @theNeomatrix369 @pedromsantos 15-20 minutes group discussion

25. @theNeomatrix369 @pedromsantos Results of the discussions

26. @theNeomatrix369 @pedromsantos Shared with the community Github: http://bit.ly/1tjLS7l

27. @theNeomatrix369 @pedromsantos Principles - tests should test one thing only - test one logical assertion - don't mix assertions of state and collaboration in the same test - modifications of production code should only break related test cases - each test should be self-contained, including data - ensure tests are independent of each other - don't refactor with a failing test - organise your unit test projects to reflect your production code - keep your tests and production code separate - do not use production data and code to test production code - if your tests are difficult to write or maintain, consider changing the design

28. @theNeomatrix369 @pedromsantos Red phase - create more specific tests to drive a more generic solution (Triangulate) - give your tests meaningful names (behaviour / goal-oriented) that reflect your production system - write the assertion first and work backwards - see the test fail for the right reason - ensure you have meaningful feedback from failing tests

29. @theNeomatrix369 @pedromsantos Green phase - write the simplest code to pass the test - write any code that makes you get to the refactor phase quicker - it is okay to write any code that you might improve at a later stage

30. @theNeomatrix369 @pedromsantos Refactor phase - refactor aggressively and constantly - treat tests as first class code - use the IDE to refactor quickly and safely - refactor production and test code independently (except changing public interfaces)

31. @theNeomatrix369 @pedromsantos Captured as a mind-map

32. @theNeomatrix369 @pedromsantos Does TDD lead to good design? Find out... http://codurance.com/2015/05/12/does-tdd-lead-to-good-design/

33. @theNeomatrix369 @pedromsantos Discuss with the community http://SoftwareCraftsmanship.slack.com channel: #tdd

34. @theNeomatrix369 @pedromsantos Big “thank you” to the first contributors http://bit.ly/235Ub3a

35. @theNeomatrix369 @pedromsantos Q&A Feedback

36. @theNeomatrix369 @pedromsantos Thanks to @jasongorman for sharing the original list

37. @theNeomatrix369 @pedromsantos Thank you!

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