Manual Vs automated testing
Types of test
- Unit test: testing individual building blocks of code in isolation. There are hundreds of unit tests. Most important.
- Integration test: test combination of multiple building blocks of code. These tests are smaller in number.
- End to end test: test complete scenario in the app as user experience them. Project typically contains only a few e2e tests.
We should test success and error cases.
Jest
- Used to run unit test.
React testing library
-
Used to render/simulate the react components.
-
Both the above tools are installed by create react app.
-
For each component create a xxx.test.js file.
-
Run npm test.
test("description", () => {
// Test
render();
expect().toBeInTheDocument();
});Test suite Vs test
describe("test group description", ()=>{
test1;
test2;
....
}The three As of testing
- Arrange
- Act
- Assert