JavaScript Unit Test Best Practices — Hooks and APIs

Knowing a test framework well is useful. Unit tests are very useful for checking how our app is working. Otherwise, we run into all kinds of issues later on. In this article, we’ll look at some best practices we should follow when writing JavaScript unit tests.

Unit tests are very useful for checking how our app is working.

Otherwise, we run into all kinds of issues later on.

In this article, we’ll look at some best practices we should follow when writing JavaScript unit tests.

Properly Set Up the Actions that Apply to All the Tests Involved

If we’re running the same thing before every test, we should put it in a beforeEach hook.

This way, we run the same piece of code before each test without repeating the code.

For example, we can write:

describe('Saving the user profile', () => {

  beforeEach(() => {
    login();
  });
  it('should save updated profile setting to database', () => {
    //...
    expect(request.url).toBe('/profiles/1');
    expect(request.method).toBe('POST');
    expect(request.data()).toEqual({ username: 'james' });
  });
  it('should notify the user', () => {
    //...
  });
});
  it('should redirect user', () => {
    //...   
  });
});

Likewise, if we have some code that we’ve to run after each test, we should have an afterEach hook that runs after each test:

describe('Saving the user profile', () => {

  beforeEach(() => {
    login();
  });
  afterEach( () => {
    logOut();
  });
  it('should save updated profile setting to database', () => {
    //...
    expect(request.url).toBe('/profiles/1');
    expect(request.method).toBe('POST');
    expect(request.data()).toEqual({ username: 'james' });
  });
  it('should notify the user', () => {
    //...
  });
  it('should redirect user', () => {
    //...   
  });
});

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