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February 18, 2020 | #TryEnglishLT
TDD supports us all the time.
You can do that tomorrow.
脱脂綿 ( @anchor_cable )
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#TryEnglishLT 2
About Me
Dassimen ( @anchor_cable )
● Yumemi Inc.
○ Software Engineer, Backend
○ PHP / Node.js / TDD / and more
● I came here by bicycle. So I’m tired.
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#engineers_lt 3
What is TDD?
Test-driven development (TDD) is a software
development process that relies on the repetition
of a very short development cycle: requirements
are turned into very specific test cases, then the
code is improved so that the tests pass.
by Wikipedia
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Agenda
#TryEnglishLT
TDD change my development.
Live coding - if we have a time
Brief description of TDD.
1
2
3
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Brief description of TDD.
1
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We want “Clean code that works”.
works
Clean
dirty
We want here!
not works
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#TryEnglishLT 7
TDD basic flow
Red Green
Refactor
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TDD basic flow
①Red：
Write a test that doesn't work.
②Green：
Write code to pass a test.
③Refactor：
Refactor with confidence.
④Write a next test.
not works works
Clean
dirty
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#TryEnglishLT 9
TDD basic flow
①Red：
Write a test that doesn't work.
②Green：
Write code to pass a test.
③Refactor：
Refactor with confidence.
④Write a next test.
Clean
dirty
not works works
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#TryEnglishLT 10
TDD basic flow
①Red：
Write a test that doesn't work.
②Green：
Write code to pass a test.
③Refactor：
Refactor with confidence.
④Write a next test.
Clean
dirty
not works works
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#TryEnglishLT 11
TDD basic flow
①Red：
Write a test that doesn't work.
②Green：
Write code to pass a test.
③Refactor：
Refactor with confidence.
④Write a next test.
Clean
dirty
not works works
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#TryEnglishLT 12
TDD basic flow
①Red：
Write a test that doesn't work.
②Green：
Write code to pass a test.
③Refactor：
Refactor with confidence.
④Write a next test.
Clean
dirty
not works works
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TDD change my development.
2
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TDD change my development.
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Before TDD
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Developing with TDD
We have some checkpoint.
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Live coding
3
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TDD practice
Cyber-dojo is very easy way to practice TDD.
https://cyber-dojo.org/
Let’s write code FizzBuzz.
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Try TDD
ex.FizzBuzz
1. Make a ToDo list.
When you get 1, return 1.
When you get 3, return “Fizz”....
2. Write a test.
assertEqual(1,judgeFizzBuzz(1))
3. Check for failed tests.
4. Write a production code to pass the test.
return 1;
5. Refactor your code.
#TryEnglishLT
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Summary
#TryEnglishLT
● TDD change us：small step, you can reach goal someday
● Live coding：you can try TDD that tomorrow
● TDD basic flow：Red→Green→Refactor
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Try it if you are interested.
Thank you for listening.
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Appendix
Book：
https://www.amazon.co.jp/dp/4274217884/ref=cm_sw_r_tw_dp_U_x_BWLBDb7XS8
DYV
Qiita：https://qiita.com/anchor-cable/items/4b7b73bc1a2163ded6b6
#TryEnglishLT