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

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Refactoring
Developer
Habits

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We are creatures of habit...

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..our habits influence our
actions greatly...

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Know and accept your
good habits !

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Know and accept your
bad habits !

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Developer habits is a
very broad subject

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But we need to start
somewhere

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The TDD life-cycle

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

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The TDD cycle
⇐ apply habits...
Red phase
⇐ apply habits...
Green phase
⇐ apply habits...
Refactor phase
⇐ apply habits...

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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?

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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?

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15-20 minutes
group discussion

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Results of the discussions

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

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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

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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

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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

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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)

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Captured as a mind-map

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

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

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

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Q&A
Feedback

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Thanks to @jasongorman for
sharing the original list

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Thank you!