describe('NonEmptyArray from array', () => {
  it('converts non-empty array', () => {
    const result = fromArraySafe([1, 2, 3])
    expect(O.isSome(result)).toBe(true)
    if (O.isSome(result)) {
      expect(result.value).toEqual([1, 2, 3])
    }
  })

  it('returns None for empty array', () => {
    const result = fromArraySafe([])
    expect(O.isNone(result)).toBe(true)
  })

  it('gets first or default', () => {
    expect(getFirstOrDefault([5, 10, 15], 0)).toBe(5)
    expect(getFirstOrDefault([], 99)).toBe(99)
  })
})