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Testing JavaScript
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Irfan Maulana
May 24, 2022
Programming
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150
Testing JavaScript
Intro to JavaScript testing
Irfan Maulana
May 24, 2022
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Transcript
Testing JavaScript By Irfan Maulana
Hi, I am Irfan Working at Tokopedia as Principal Engineer
for Web Platform Team. mazipan.space @Maz_Ipan
A process to verifying the correctness & validating the functional
features of the app being developed APPLICATION TESTING
Software Development Life Cycle
JAVASCRIPT APPLICATION Frontend Backend Handling UI functionality: web, apps, desktop
Handling business logic, data store connection A B We will focus on the Frontend for this session.
PERFORM APP TESTING MANUAL AUTOMATED
WHY DO WE NEED? Bugs are bad, and who gets
blamed? The developer. You know humans are bad at complex, repetitive tasks. Computers are very, very good at complex, repetitive tasks. A professional ships working code. Code that works. Code that is well tested.
Focused on input & output. Not interested about the things
happening inside. Involve testing of the internal structure, code, design & implementation. METHODOLOGIES BLACKBOX WHITEBOX
TESTING PROCESS 1. PLANNING 2. PREPARATION 3. EXECUTION 4. REPORTING
THE TESTING TYPES
PROVEN METHOD FOR TESTING APP
STATIC TEST To catch typos, errors, possible bugs as you
write the code. Tools: • ESLint + Prettier • CodeQL, Snyk, SonarQube
Very fast feedback Can not reproduce functional bugs faced by
users STATIC TEST: PRO & CONS We can mark it as mandatory Very beneficial in the development phase
UNIT TEST To verify that individual, isolated and smallest part
works as expected. Tools: • TestingLibrary.com
Fast feedback Need an extra effort to write UT UNIT
TEST: PRO & CONS Verify the correctness of the function Can not represent the bug when the unit integrated Can not represent real user interaction
INTEGRATION TEST To verify that several units work together in
harmony. Tools: • TestingLibrary.com
Verify most of user interactions Slower feedback than UT More
effort than UT INTEGRATION TEST: PRO & CONS Can not represent device variant Can not replicate using the real data
END-TO-END TEST A robot that behaves like a user to
click around the app and verify that it functions correctly. Tools: • Cypress • Nightwatch • TestCafe
Can use multiple device Very slow to executed Need the
biggest effort E2E TEST: PRO & CONS Can use real data Replicate real user
COMPARISON Static Test Unit Test Integration E2E Test 🚀 Speed
🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 ⏰ Development time 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 💰 Cost 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 😎 Confidence 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 🟢 Read more on https://kentcdodds.com/blog/static-vs-unit-vs-integration-vs-e2e-tests
BEST ROI https://twitter.com/kentcdodds/status/960723172591992832
DEMO TIME!
CHECK THE CODE https://github.com/mazipan/react-testing-workshop Prerequisites: • Node.js
ASK ME!
CREDITS: This presentation template was created by Slidesgo, including icons
by Flaticon, and infographics & images by Freepik and illustrations by Stories. THANK YOU Please keep this slide for attribution.