describe('createUserOptionFromAge', () => {
  const user1: User = { id: 1, name: 'Alice', age: 25 }
  const user2: User = { id: 2, name: 'Bob', age: 30 }

  it('returns some if user has same age as given age', () => {
    const result = createUserOptionFromAge(30)(user2)
    expect(result).toEqual(O.some(user2))
  })

  it('returns O.none if user does not have same age as given age', () => {
    const result = createUserOptionFromAge(20)(user1)
    expect(result).toEqual(O.none)
  })
})