How to make jest not distinguish between negative zero and positive zero?

Question

What is the best way to make Jest pass the following test:

test('example', () => {
  expect(0).toEqual(-0);
});

I don't want to distinguish negative zero and positive zero.

---

Maybe I should use some other function instead of .toEqual? Or I should replace all blocks like this:

expect(a).toEqual(b);

to

expect(a === 0 ? +0 : a).toEqual(b === 0 ? +0 : b);

?

Answer 1

You can slightly sidestep the issue by doing your logic inside of the expect function:

expect(0).toEqual(-0); // fails
expect(0 === -0).toEqual(true); // ugly, but it works!

Answer 2

A solution for lists and nested objects would be to convert them to JSON and back.

const negativeObject = { list: [-0, -0] };
const positiveObject = { list: [0, 0] };

expect(JSON.parse(JSON.stringify(negativeObject)))
  .toEqual(positiveObject);

This works because JSON.stringify() converts -0 to 0.