How to test a Jest console.log with Jest and JavaScript?

To test a Jest console.log with Jest and JavaScript, we can spy on the console.log method.

For instance, we write

it('calls console.log with "hello"', () => {
  const consoleSpy = jest.spyOn(console, "log");

  console.log("hello");

  expect(consoleSpy).toHaveBeenCalledWith("hello");
});

to call jest.spyOn to spy on the console.log method.

Then we call console.log with the value we want to check.

Next we check the value console.log is called with with toHaveBeenCalledWith.