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What does the following test check? test('adds 2 + 2 to equal 4', () => { ...

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What does the following test check?

test('adds 2 + 2 to equal 4', () => {
expect(add(2, 2)).toBe(4);
});

It checks if 2 + 2 equals 2

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It creates a new function

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It checks if add(4) returns 2

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It checks if add(2, 2) equals 4

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