codex-lv3-may-2025

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Level 14: Testing When Result is Zero

What if the result itself is zero? Let’s test that:

Plan: ensure opposite values cancel out by verifying add(5, -5) returns 0.

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it('should add when result is zero', () => {
  const result = add(5, -5);
  expect(result).toBe(0);
});

Try it: Add this test and verify it works!

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