import {
    describe,
    expect,
    it,
} from 'vitest';
import { cn } from './cn';

describe('cn utility', () => {
    it('should merge classes with clsx', () => {
        expect(cn('class1', 'class2')).toBe('class1 class2');
        expect(cn('class1', { class2: true, class3: false })).toBe('class1 class2');
    });

    it('should resolve tailwind specificity conflicts', () => {
        // text-neutral-400 vs text-brand (text-brand should win)
        expect(cn('text-neutral-400', 'text-brand')).toBe('text-brand');

        // p-4 vs p-2
        expect(cn('p-4', 'p-2')).toBe('p-2');

        // dark mode classes should be handled correctly too
        expect(cn('text-neutral-400 dark:text-neutral-400', 'text-brand dark:text-brand')).toBe(
            'text-brand dark:text-brand',
        );
    });

    it('should handle undefined and null inputs', () => {
        expect(cn('class1', undefined, null, 'class2')).toBe('class1 class2');
    });
});