import { describe, it, expect } from 'vitest';
import { unitFamily } from '../../src/lib/server/unit-consolidation';

describe('unitFamily', () => {
  it('maps g and kg to weight', () => {
    expect(unitFamily('g')).toBe('weight');
    expect(unitFamily('kg')).toBe('weight');
  });
  it('maps ml and l to volume', () => {
    expect(unitFamily('ml')).toBe('volume');
    expect(unitFamily('l')).toBe('volume');
  });
  it('lowercases and trims unknown units', () => {
    expect(unitFamily(' Bund ')).toBe('bund');
    expect(unitFamily('TL')).toBe('tl');
    expect(unitFamily('Stück')).toBe('stück');
  });
  it('is case-insensitive for weight/volume', () => {
    expect(unitFamily('Kg')).toBe('weight');
    expect(unitFamily('ML')).toBe('volume');
  });
  it('returns empty string for null/undefined/empty', () => {
    expect(unitFamily(null)).toBe('');
    expect(unitFamily(undefined)).toBe('');
    expect(unitFamily('')).toBe('');
    expect(unitFamily('   ')).toBe('');
  });
});