JavaScript Unit Test Best Practices — Names and Expects

JavaScript Unit Test Best Practices — Names and Expects

Things to look for in name and expectation. 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 test

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.

Name Our Tests Properly

We should have concise, explicit, and descriptive names in our tests.

This way, we know what we’re testing.

Instead of writing:

describe('employee app', () => {
  it('returns an array', () => {
  });
  // ...
});

We write:

describe('employee app', () => {
  it('returns a list of employees when initialized', () => {
  });
  it('should calculate the pay of an employee when initialized', () => {
  });
// ...
});

We have the unit of work, scenario or content, and the expected behavior.

We can have them in this format:

describe('[unit of work]', () => {
  it('should [expected behaviour] when [scenario/context]', () => {
  });
});

or:

describe('[unit of work]', () => {
  describe('when [scenario/context]', () => {
    it('should [expected behaviour]', () => {
    });
  });
});

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