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Implementing a test suite in an existing Frontend application
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Mirjam Aulbach
February 23, 2021
Programming
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Implementing a test suite in an existing Frontend application
Slides to my talk at JS World Conference 2021.
Mirjam Aulbach
February 23, 2021
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Transcript
Better late than never
Mirjam ! Software Engineer twitter: @mirjam_diala | github/gitlab: @programmiri
I ! Testing twitter: @mirjam_diala | github/gitlab: @programmiri
Me when someone says they don't like testing twitter: @mirjam_diala
| github/gitlab: @programmiri
Roadmap ✔ Hello World! " Where we started # First
steps $ When to test? % How to test? & The 3 most important learnings ' Summary twitter: @mirjam_diala | github/gitlab: @programmiri
Where we started twitter: @mirjam_diala | github/gitlab: @programmiri
twitter: @mirjam_diala | github/gitlab: @programmiri
23.03.2018 » 38.181 lines of code » 291 JS files
» 238 React components twitter: @mirjam_diala | github/gitlab: @programmiri
UI Tests: 877 twitter: @mirjam_diala | github/gitlab: @programmiri
Integration and Unit Tests: 0 twitter: @mirjam_diala | github/gitlab: @programmiri
actual footage of me seeing this numbers media source: https://giphy.com/gifs/queen-recap-geek-V9SviiJPLyFQ4/
Legacy Code? twitter: @mirjam_diala | github/gitlab: @programmiri
"Nobody touch nothing" Alien, 1986 media source: https://getyarn.io/yarn-clip/7555a768-216e-40a0-9f9d-bb417a138186
"To me, legacy code is simply code without tests." Michael
C. Feathers "Working Effectively with Legacy Code" media source: https://getyarn.io/yarn-clip/7555a768-216e-40a0-9f9d-bb417a138186
media source: https://imgur.com/gallery/XkM0Jqp
Solution? twitter: @mirjam_diala | github/gitlab: @programmiri
twitter: @mirjam_diala | github/gitlab: @programmiri
Why retrofit a test suite? (for real) twitter: @mirjam_diala |
github/gitlab: @programmiri
Why retrofit a test suite » become futureproof » keep
the Extensibility » Refactoring easier » reduce bugs long-term » find bugs before my user does media source: https://gfycat.com/piercinghospitabledwarfrabbit
"We're going to rewrite that anyway!" media source: https://giphy.com/gifs/bublywater-2mEhEXJTxEJFBMVduR
Roadmap ✔ Hello World! ✔ Where we started " First
steps # When to test? $ How to test? % The 3 most important learnings & Summary twitter: @mirjam_diala | github/gitlab: @programmiri
First steps twitter: @mirjam_diala | github/gitlab: @programmiri
You have to sell this twitter: @mirjam_diala | github/gitlab: @programmiri
How to tell my... » !"#$% » &'() » *+,⏰
twitter: @mirjam_diala | github/gitlab: @programmiri
Useful tools media source: https://giphy.com/gifs/laff-tv-funny-comedy-25JgMcsSndyuBkoaV2
Useful tools Will support you before the first test -
pinky promise » Code formatter and linting » Component library » Faster UI tests » Error tracking twitter: @mirjam_diala | github/gitlab: @programmiri
Workflow rules media source: https://giphy.com/gifs/season-17-the-simpsons-17x12-xT5LMQgPLUzWHfZ0hW
Workflow rules » Tests before commit » Tests before build
» Tests are part of code review » Improvement tickets for refactorings twitter: @mirjam_diala | github/gitlab: @programmiri
Roadmap ✔ Hello World! ✔ Where we started ✔ First
steps " When to test? # How to test? $ The 3 most important learnings % Summary twitter: @mirjam_diala | github/gitlab: @programmiri
When to test? twitter: @mirjam_diala | github/gitlab: @programmiri
‼ New functionality only with tests twitter: @mirjam_diala | github/gitlab:
@programmiri
! If Bug then test twitter: @mirjam_diala | github/gitlab: @programmiri
! Test before changes twitter: @mirjam_diala | github/gitlab: @programmiri
! Use idle times twitter: @mirjam_diala | github/gitlab: @programmiri
Roadmap ✔ Hello World! ✔ Where we started ✔ First
steps ✔ When to test? " How to test? # The 3 most important learnings $ Summary twitter: @mirjam_diala | github/gitlab: @programmiri
How to test? twitter: @mirjam_diala | github/gitlab: @programmiri
Order ! ⭕ Tests twitter: @mirjam_diala | github/gitlab: @programmiri
Order ! ⭕ Tests media source: https://giphy.com/gifs/cartoonhangover-cute-sad-fR7StZn0GlJYdx9Pfs
Order ! ⭕ Tests "Characterisation" || "Pinning" media source: https://giphy.com/gifs/cartoonhangover-cute-sad-fR7StZn0GlJYdx9Pfs
Order ! ✅ Tests # ⭕ Refactor -> rinse and
repeat! twitter: @mirjam_diala | github/gitlab: @programmiri
Order ! ✅ Tests # ✅ Refactor ! ⭕ Tests
# ⭕ Code $ ⭕ Refactor media source: https://giphy.com/gifs/mad-lights-2d-3oKIP833PIFb553OP6
Roadmap ✔ Hello World! ✔ Where we started ✔ First
steps ✔ When to test? ✔ How to test? " The 3 most important learnings # Summary twitter: @mirjam_diala | github/gitlab: @programmiri
With this 3 tips you can't do ANYTHING wrong again
probably twitter: @mirjam_diala | github/gitlab: @programmiri
Tip # 1: Keep 'em separated media source: https://www.youtube.com/watch?v=1jOk8dk-qaU
Tip for separating: . . VanillaJS is love, VanillaJS is
life! Yeah, ok, you can also use Typescript
Tip for separating: . . Dumb is the new sexy!1
1 Only with code components. media source: https://giphy.com/gifs/talk-warming-rpt-Q1aRmd8e90WIw
Tip #2: media source: http://t.co/ca31My7
Tip #3: Perfection is not an excuse “Imperfect action is
better than perfect inaction.” – Harry Truman media source: https://giphy.com/gifs/hoppip-art-film-bOflabuL47FKg
Roadmap ✔ Hello World! ✔ Where we started ✔ First
steps ✔ When to test? ✔ How to test? ✔ The 3 most important learnings " Summary twitter: @mirjam_diala | github/gitlab: @programmiri
So... did it work? twitter: @mirjam_diala | github/gitlab: @programmiri
First test media source: https://www.youtube.com/watch?v=EH3X4469Aag
media source: https://www.youtube.com/watch?v=EH3X4469Aag
Actual footage of me testing code media source: https://www.youtube.com/watch?v=EH3X4469Aag
! 10/10 would write tests again. twitter: @mirjam_diala | github/gitlab:
@programmiri
And that's it! Thanks ! » twitter: @mirjam_diala » github/gitlab:
programmiri » web: programmiri.rocks media source: https://www.youtube.com/watch?v=EH3X4469Aag