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.

Tests as a Live Collaborative Document

Tests tell a lot about what our system does.

They have lots of descriptions and checks that show us what it can do.

There’re also things like Storybooks and UI components that tell us what they do.

We can look through each component with them.

We can use various tools to detect visual issues.

They aren’t captured in unit or integration tests.

These tools save screenshots of our app so that we can see any flaws in our app.

There’re also tools like Applitools, Percy.io that let us manage the screenshots and detect visual noise with their own technology automatically.

We can get enough test coverage to make us confident in our tests.

Around 80% should cover the most important parts.

We can use CI tools to check if we meet the threshold for test coverage.

Most testing frameworks can get test coverage without much trouble.

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