import { plainToInstance } from 'class-transformer';
import { validate } from 'class-validator';
import { ListEmployeesQueryDto } from './employee.dto';

describe('ListEmployeesQueryDto', () => {
  it('coerces a single position query value into an array', async () => {
    const dto = plainToInstance(ListEmployeesQueryDto, { position: 'sales' });
    expect(dto.position).toEqual(['sales']);
    expect(await validate(dto)).toHaveLength(0);
  });

  it('accepts multiple positions', async () => {
    const dto = plainToInstance(ListEmployeesQueryDto, {
      position: ['sales', 'driver'],
    });
    expect(dto.position).toEqual(['sales', 'driver']);
    expect(await validate(dto)).toHaveLength(0);
  });

  it('rejects an invalid position in the array', async () => {
    const dto = plainToInstance(ListEmployeesQueryDto, {
      position: ['pilot'],
    });
    expect(await validate(dto)).not.toHaveLength(0);
  });

  it('drops empty entries and deduplicates positions', async () => {
    const dto = plainToInstance(ListEmployeesQueryDto, {
      position: ['sales', '', 'sales'],
    });
    expect(dto.position).toEqual(['sales']);
    expect(await validate(dto)).toHaveLength(0);
  });
});