Problems when running unit tests with Jest where the ValidationPipe is not triggered.

[arnarleifs]

The problem

When running a unit test using Jest the validation pipeline is not triggered. The expected behaviour would be by providing incorrect values to a route which accepts a body that the validation pipe would be triggered and an error returned to the client.

// The input model
import { IsNumber, IsNotEmpty, IsString, IsOptional } from 'class-validator';

export class UpdateAlbumInputModel {
  @IsNotEmpty()
  @IsNumber()
  albumId: number;
  @IsOptional()
  @IsString()
  description?: string;
  @IsNotEmpty()
  @IsString()
  name: string
}

// The route
@Put('/albums')
@HttpCode(204)
public async updateAlbums(
  @Body(ValidationPipe) body: UpdateAlbumInputModel
) {
  return await this.albumService.updateAlbums(body);
}

The unit test can be found here:

it('should fail to update albums, if the body is invalid', async () => {
  await testApiHandler({
    handler: albumHandler,
    url: '/api/albums',
    test: async ({ fetch }) => {
      const res = await fetch({
        method: 'PUT',
        body: JSON.stringify({
          description: 'description',
        }),
        headers: {
          'Content-Type': 'application/json',
        },
      });
      // This returns a 204 status code, but expected to return an invalid status code of 400 (Bad Request)
      console.log(res);
    },
  });
});

Additional context

Response {
        size: 0,
        timeout: 0,
        cookies: [Getter],
        [Symbol(Body internals)]: {
          body: PassThrough {
            _readableState: [ReadableState],
            _events: [Object: null prototype],
            _eventsCount: 2,
            _maxListeners: undefined,
            _writableState: [WritableState],
            allowHalfOpen: true,
            [Symbol(kCapture)]: false,
            [Symbol(kCallback)]: null
          },
          disturbed: false,
          error: null
        },
        [Symbol(Response internals)]: {
          url: 'http://localhost:53325/',
          status: 204,
          statusText: 'No Content',
          headers: Headers { [Symbol(map)]: [Object: null prototype] },
          counter: 0
        }
      }

Package versions: "class-transformer": "0.5.1", "class-validator": "0.14.0", "next-api-decorators": "2.0.2",