import { isUuid } from './string.utils'; describe('String Utils', () => { describe('isUuid', () => { it('should return true for valid UUID v4', () => { expect(isUuid('550e8400-e29b-41d4-a716-446655440000')).toBe(true); }); it('should return false for invalid strings', () => { expect(isUuid('not-a-uuid')).toBe(false); expect(isUuid('12345')).toBe(false); }); }); });