import { describe, expect, it } from 'vitest';
import { bucharestClock, uptimeSince } from '@/lib/operations';

describe('uptimeSince', () => {
  const start = new Date('2025-08-01T00:00:00Z');
  it('is zero at the start', () => {
    expect(uptimeSince(start, start)).toEqual({ months: 0, days: 0 });
  });
  it('counts whole months and remaining days', () => {
    expect(uptimeSince(start, new Date('2026-10-10T00:00:00Z'))).toEqual({ months: 14, days: 9 });
  });
  it('clamps to zero before the start', () => {
    expect(uptimeSince(start, new Date('2025-01-01T00:00:00Z'))).toEqual({ months: 0, days: 0 });
  });
});

describe('bucharestClock', () => {
  it('formats HH:MM in Europe/Bucharest', () => {
    expect(bucharestClock(new Date('2026-01-15T10:05:00Z'))).toBe('12:05');
  });
});