Manjula Dube
Senior Developer @Bookmyshow
Organizer @Mumbai Women Coders
Google Developer Group - Mumbai Chapter
@manjula_dube
Do you really test?
We just love the
IDEA OF TESTING
Existing Problems
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More Effort => Less Tests
Less Effort => More Tests
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If you are writing tests:
you are already winning
If you are not writing tests:
let me encourage you to start
How do we prevent bugs?
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1. Flow -Static Type Checker
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2. Linting: ESLint
3. Testing?????
Testing?
Catch some bugs before they can happen...
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Write better code
Stability
Executable documentation
What kinds of testing can we do?
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Usability Testing
Performance Testing
Penetration Testing
Integration Testing
E2E Testing
Regression Testing
Smoke Testing
Unit Testing
Fuzz Testing
Stress Testing
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- Tape
TOOLS/FRAMEWORKS
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Ch
- Chai
- Cucumber
- Mocha
- Ava
- Enzyme
- Jasmine
- Sinon
Function
COMPONENTS
REDUCERS
ACTIONS
Unit testing in React app?
JEST
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How do we test our react components?
Why Jest?
Zero Configuration
Instant run
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Snapshot testing
Code coverage
Interactive watch mode
Setting up Jest
npm install --save-dev jest
OR
yarn add --dev jest
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What is Snapshot Testing?
How does snapshot work?
jest --updateSnapshot
Snapshots Benefits
Automate process, to manage snapshots
Adapt changes
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Easy to maintain
Lets test the Action button component on BookMyShow.
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<ActionButton/>
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FUTURE Scope of jest
- Browser snapshots — This will get snapshots by rendering your UI on a real browser.
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- Image snapshots — This will get snapshots as images so we can test CSS and style changes as well.
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Future Shines
Jest v/s Enzyme?
Enzyme is a javascript testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
Shortcomings of using jest.
Merge conflicts
Overuse
You can’t TDD
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Logical bugs can still persist based on varying app behaviours.
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How testing helped us?
Should I use them or not?
Thankyou
@manjula_dube
Convinced you to write more of test cases
Happy testing :)
https://medium.com/@manjuladube