Jest-Style JavaScript Tester

Write your code and a Jest-like test script to verify its behavior.

Your Code

function add(a, b) {
  return a + b;
}

function add(a, b) {
  return a + b;
}

Your Test Script (using `describe`, `it`, `expect`)

describe('add function', () => {
  it('should return 3 for add(1, 2)', () => {
    expect(add(1, 2)).toBe(3);
  });

  it('should handle negative numbers', () => {
    expect(add(-1, -1)).toBe(-2);
  });
});

describe('add function', () => {
  it('should return 3 for add(1, 2)', () => {
    expect(add(1, 2)).toBe(3);
  });

  it('should handle negative numbers', () => {
    expect(add(-1, -1)).toBe(-2);
  });
});