What is Jest testing and how do I use it?

What is Jest testing and how do I use it?

Jest is a JavaScript testing framework designed to ensure correctness in your code. It's widely used for testing React applications.

Can you show me a simple example of a Jest test?

Sure! Here's a basic example:

function sum(a, b) {
  return a + b;
}

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

How do I run my Jest tests?

You can run your Jest tests by using the command npm test or jest in your terminal, depending on your setup.

What are some common Jest matchers I should know?

Some common Jest matchers include toBe(), toEqual(), toBeTruthy(), and toHaveLength(). They help you make assertions in your tests.