code: protected boolean isPreviousResponse(Response response, Collection<Response> existingResponses) {
  		boolean previousResponse = false;
  
  		for (Response existingResponse : existingResponses) {
  			if (response.getAction().equals(existingResponse.getAction())) {
  				previousResponse = true;
  			}
  		}
  
  		return previousResponse;
  	}
docs: Test a given {@link Response} to see if it's been executed before.
  
  @param response {@link Response} to test to see if it's been executed before
  @param existingResponses set of previously executed {@link Response}s
  @return true if {@link Response} has been executed before