Testing is crucial for ensuring React apps are stable and bug-free. Popular tools like Jest and React Testing Library make testing React components simple.
Let’s look at how to write great tests for React:
Render the component into a test environment using
render from React Testing Library:
This renders the component virtually for testing.
Simulate user events like clicks with
Use matchers like
toBeInTheDocument to make assertions:
Spy on callbacks with mock functions:
This allows asserting function calls.
- Use render to mount components
- Fire events to simulate interaction
- Make assertions with matchers
- Spy on callbacks with mock functions
Automated testing results in robust React components you can refactor with confidence.