UNIT TESTING
What is Unit Testing?
defined as a type of software testing where individual units/ components of a software are tested.
Why is it Important?
- Unit Tests fix bug early in
development cycle and save costs. - It helps
understand the developers the code base and enable them to make changes quickly. - Good unit tests serve as project documentation
- Unit tests help with code re-use. Migrate both your code and your tests to your new project. Tweak the code till the tests run again.
MYTH:
It requires time, and I am always overscheduled
My code is rock solid! I do not need unit tests.
UNIT TEST != INTEGRATION TEST
UNIT TEST is easy to implement
Covers a single piece of code (usually an object or a function) tested the behavior without external resources
UNIT TEST PATTERN
The AAA Phrases
Arrange, Act, Assert
TDD
Test Driven Development
RULES:
- You are not allowed to write any production code unless it is to make a failing unit test pass.
- You are not allowed to write any more of a unit test
than is sufficient to fail, and compilation failures are failures. - You are not allowed to write any more production code than is sufficient to pass the one failing
unit test.
Testing Framework:
I picked JEST:
- built-in assertion method
- multi-environment, it can use in node and browser
- can watch and run untested code or code changes only
- built-in coverage
Sometimes We need to mock our data
Mock?
mocking is creating objects that simulate the behavior of real objects.
Mocking framework:
- Supertest
- Pretender
- Jest Mock (usually just mock function call)
- Sinon
- Test Double
- Enzyme (for react)
- React Test Renderer
- Nock
- Any suggestion
Is there an easy way to test React Component?
Yes:
Advantage
- Not much boilerplate code
- No need init setup
- Enforce to write better test cases
- No shallow rendering
- No need forceUpdate
Misc:
describe('Test Fungsi A', () => {
it('should work perfectly', () => {
// arrange
// act
// assert
});
});Example:
Thank you
Unit Testing in React
By ikhsanalatsary
