rejects.toThrow() only works when an instance of Error is thrown

[farah]

🐛 Bug Report

Currently the .rejects.toThrow() assertion only works when the argument is an instance of new Error(). It does not work when it's a string or a plain object.

To Reproduce

describe('Jest bug', () => {
	it('fails when string is thrown', async () => {
		await expect(async () => {
			throw 'octopus';
		}).rejects.toThrow();
	});

	it('fails when plain object is thrown', async () => {
		await expect(async () => {
			throw { octopus: 'octopus' };
		}).rejects.toThrow();
	});

	it('passes when Error object is thrown', async () => {
		await expect(async () => {
			throw Error('octopus');
		}).rejects.toThrow();
	});
});

Expected behavior

Test cases 1 and 2 should pass. I know this may very well be a feature and not a bug and in that case I'd like to open the discussion in changing the behaviour of .toThrow() to pass on the first two cases. I think the results are rather inconsistent.

[jeysal]

Correct me if I'm wrong, but I think this is a duplicate of #6675

[github-actions]

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