describe('Semigroup basics', () => {
  it('combines strings with space', () => {
    const result = combineStrings('Hello', 'World')
    expect(result).toBe('Hello World')
  })

  it('sums numbers using SemigroupSum', () => {
    const result = combineNumbers([1, 2, 3, 4, 5])
    expect(result).toBe(15)
  })

  it('handles single number', () => {
    const result = combineNumbers([42])
    expect(result).toBe(42)
  })
})