code: public function it_throws_an_exception_if_a_workflow_does_not_exist($pipelines)
      {
      	$pipelines->exists('unknownWorkflow')->shouldBeCalled()->willReturn(false);
  
      	$this->shouldThrow('BadFunctionCallException')->duringUnknownWorkflow();
      }
docs: @testdox	It throws an exception if a workflow does not exist.
  
  @author	Andrea Marco Sartori
  @return	void