carmanagement/apps/homepage/tests/unit/theme.test.ts

import { currentThemePreference } from '@/lib/theme/client';
import { isThemePreference, resolveTheme, serverResolvedTheme } from '@/lib/theme/config';
import { describe, expect, it } from 'vitest';

describe('theme foundations', () => {
  it('accepts only approved preferences', () => {
    expect(isThemePreference('light')).toBe(true);
    expect(isThemePreference('dark')).toBe(true);
    expect(isThemePreference('system')).toBe(true);
    expect(isThemePreference('sepia')).toBe(false);
  });

  it('keeps preference and resolved theme separate', () => {
    expect(resolveTheme('system', true)).toBe('dark');
    expect(resolveTheme('system', false)).toBe('light');
    expect(resolveTheme('light', true)).toBe('light');
    expect(serverResolvedTheme('system')).toBe('light');
  });

  it('defaults client theme preference to dark when no choice exists', () => {
    delete document.documentElement.dataset.themePreference;
    expect(currentThemePreference()).toBe('dark');
  });
});