React Testing Library & Jest-React UI testing tool

Example

render(<Button />)

Scenario

Used to mount a React component in a virtual DOM for testing purposes. This allows developers to perform assertions or trigger events on the component as if it were running in a real browser environment.

Example

fireEvent.click(screen.getByRole('button'))

Scenario

Enables simulating user interactions such as clicks, typing, or form submissions. This is essential for verifying the interactive aspects of components, ensuring they respond as expected to user inputs.

Example

expect(screen.getByText(/save/i)).toBeInTheDocument()

Scenario

In conjunction with Jest, RTL allows developers to write assertions about the state of the DOM after various interactions or lifecycle events, verifying that the component behaves correctly under different conditions.

Example

jest.mock('axios')

Scenario

Jest can intercept and simulate API calls or other module functionality, which is crucial for testing components that depend on external data or configurations without relying on live endpoints.

Example

await waitFor(() => expect(queryByText('Loading')).not.toBeInTheDocument())

Scenario

Both RTL and Jest handle asynchronous events, such as fetching data after user interaction or timers. This allows testing of components that depend on asynchronous data or actions.