toMatchObject pass on comparing different Error objects

[thymikee]

Do you want to request a feature or report a bug?
enhancement

What is the current behavior?
toMatchObject pass on comparing different Error objects.

repro
This test will pass:

test('toMatchObject passes on different Errors', () => {
  expect(new Error('foo')).toMatchObject(new Error('bar'));
});

What is the expected behavior?
toMatchObject should fail on comparing Errors and show a proper message.

Originally reported in: #3795

[anilreddykatta]

@thymikee toMatchObject should compare Error objects too? Or it should just fail without comparing when we encounter Error objects?

[jseminck]

@thymikee am I correct in assuming that these tests should pass:

test('toMatchObject passes on similar Errors', () => {
  expect(new Error('foo')).toMatchObject(new Error('foo'));
});

and

test('toMatchObject fails on different Errors', () => {
  expect(new Error('foo')).not.toMatchObject(new Error('bar'));
});

[thymikee]

Not yet, but in next Jest release.

[jseminck]

Ah. I see there is an open PR already. I was investigating this issue as well as I assumed it was still open. Anyway added a comment on the PR instead.

[github-actions]

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