JavaScript Unit Test Best Practices 

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. Use Realistic Input Data We should use realistic input data in our tests so that we know what we’re testing with.

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.

Use Realistic Input Data

We should use realistic input data in our tests so that we know what we’re testing with.

To make generate fake data easily, we can use the Faker package.

It can generate names, username, company names, credit card numbers, and more.

For example, we can write:

it("should add product", async () => {
  const addProductResult = addProduct(faker.commerce.productName(), faker.random.number());
  expect(addProductResult).to.be.true;
});

We have a test to add a product with realistic names and ID number so that we can understand the result.

Test Many Input Combinations

We should test many input combinations.

This way, we won’t only choose cases that we know will make our test pass.

We can make the values random.

And we can also several permutations of some data in our test.

For example, with the fast-check library, we can create random combinations of data for our test:

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