Introduction to TDD
Alvaro García - @alvarobiz
A G Maur Idea
2015-05-27
v 1.2
Who am i
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- I craft software
-
Currently, one big client
- and some small ones
- I tweet at @alvarobiz
- I blog at alvarogarcia7.github.io
- Came here to learn from you
This is me crafting
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More like...
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Who am i (II)
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-
Invited to organize:
- Software Craftsmanship Barcelona meetup
- Software Craftsmanship Barcelona 2014
- Dev Practices & Craftsmanship Track at the CAS 2014
What is this tdd thing
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?
Wasn't tdd dead?
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Wait what??
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well maybe not...
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- The right tool for the right job
- It works for others and for me
-
is there some interest?
- that's why you came :)
a tdd cycle
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Have you understood?
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Nope
let me implement that
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Have you understood?
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Yep
Refactor
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Have you understood?
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Yep
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Questions?
What it really is about
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- Clean code that works (Ron Jeffries)
- Predictable way to develop
some benefits
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- {Learn from / Listen to} your tests (GOOS)
- Reduce speculative development
- Increase confidence in team
More in depth
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Red: implement a failing test
Green: implement a passing test
Refactor: change how but not what
Compare that to test last
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Implement a feature
Refactor said feature (!)
Create a test for the feature
The test is not passing
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Debug
Ahh, damn
Fix
Finally :)
Compare that to test last (II)
TDD to explain tdd
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Thanks to Stanley Milgram for the social experiment :)
Show me the code
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Specifications
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As a meetup organizer,
I want a list
That can store strings
So I can store the attendants' names
(Java) API
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- Constructor: new MyStringList()
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Methods:
- void add(String)
- boolean isEmpty()
- boolean contains(String)
(please don't use any java.util.* collection :) )
Final code
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here:
That's all folks
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Questions?
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Feedback ?
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Raise your hands when:
Thanks
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tweet about it: @alvarobiz :)
Mocks, stubs, fakes
AND OTHER TEST DOUBES
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Mock
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STUB
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FAKE
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DUMMY
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SPY
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That's all folks
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NOW IT IS YOUR TURN
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