What are the best practices for using Testing Library?

What are the best practices for using Testing Library?

Some best practices include using queries that resemble how users find elements, avoiding implementation details, and keeping tests focused.

Can you give me an example of a good test using Testing Library?

Sure! Here's a simple example:

import { render, screen } from '@testing-library/react';
import MyComponent from './MyComponent';

test('renders learn react link', () => {
  render(<MyComponent />);
  const linkElement = screen.getByText(/learn react/i);
  expect(linkElement).toBeInTheDocument();
});

What should I avoid when writing tests?

Avoid testing implementation details, using too many assertions in a single test, and making tests dependent on each other.

How can I improve the performance of my tests?

You can improve performance by minimizing re-renders, using waitFor wisely, and avoiding unnecessary setup in your tests.