import { describe, expect, it } from 'vitest';

import { formatDate } from '../../../resources/js/lib/format.js';

describe('formatDate', () => {
    it('returns an em dash for empty values', () => {
        expect(formatDate('')).toBe('—');
        expect(formatDate(null)).toBe('—');
        expect(formatDate(undefined)).toBe('—');
    });

    it('returns the raw value when it is not a valid date', () => {
        expect(formatDate('not-a-date')).toBe('not-a-date');
    });

    it('formats valid ISO dates for display', () => {
        const result = formatDate('2026-10-26T12:30:00.000000Z');

        // Locale- and timezone-tolerant: only assert the stable date parts.
        expect(result).toMatch(/Oct\s+26,\s+2026/);
        expect(result).not.toBe('2026-10-26T12:30:00.000000Z');
    });
});