text: import add from './add'
  
  describe('Add functionality', () => {
    it('adds two numbers and returns their sum', () => {
      expect(add(2, 2)).toBe(4)
    })
    it('works with negative numbers', () => {
      expect(add(-1, 2)).toBe(1)
    })
    it('works with numeric strings', () => {
      expect(add('2', '2')).toBe(4)
    })
    it('fails when given non-numeric values', () => {
      expect(() => add(null, true)).toThrow(TypeError)
    })
    it('works with more than 2 numbers', () => {
      expect(add(2, 2, 2, 2)).toBe(8)
    })
  })
  