import { describe, expect, it } from 'vitest'
import { formatDate, greeting, toIsoDate } from './dates'

describe('dates', () => {
  it('formats ISO dates without time-zone drift', () => {
    expect(formatDate('2024-08-28')).toBe('Aug 28, 2024')
  })

  it('converts a local date to an ISO calendar date', () => {
    expect(toIsoDate(new Date(2024, 0, 5, 23, 59))).toBe('2024-01-05')
  })

  it('greets by time of day', () => {
    expect(greeting(new Date(2024, 0, 1, 8))).toBe('Good morning')
    expect(greeting(new Date(2024, 0, 1, 13))).toBe('Good afternoon')
    expect(greeting(new Date(2024, 0, 1, 20))).toBe('Good evening')
  })
})