Dingo\Api\Http\Response::setTransformer PHP Method

    public static function setTransformer(TransformerFactory $transformer)
    {
        static::$transformer = $transformer;
    }

 public function setUp()
 {
     $this->formatter = m::mock('Dingo\\Api\\Http\\ResponseFormat\\JsonResponseFormat');
     $this->formatter->shouldReceive('getContentType')->andReturn('foo');
     Response::setFormatters(['json' => $this->formatter]);
     Response::setTransformer(m::mock('Dingo\\Api\\Transformer\\Transformer')->shouldReceive('transformableResponse')->andReturn(false)->getMock());
 }