code: public function it_draws_a_workflow_with_zero_pipes($pipelines)
      {
      	$pipelines->getPipesByPipeline('RegisterUser')->willReturn([]);
  
      	$drawing = file_get_contents(__DIR__ . '/stubs/zero.stub');
  
      	$this->draw('RegisterUser')->shouldReturn($drawing);
      }
docs: @testdox	It draws a workflow with zero pipes.
  
  @author	Andrea Marco Sartori
  @return	void