如何在Rails中处理带有RSpec测试的坏请求？

describe "POST create" do
  context "with invalid parameters" do
    it "returns a bad request status" do
      post :create, params: { invalid_params }
      expect(response).to have_http_status(:bad_request)
    end
  end
end

class ApplicationController < ActionController::Base
  rescue_from ActionController::BadRequest, with: :render_bad_request

  private

  def render_bad_request(exception)
    render json: { error: exception.message }, status: :bad_request
  end
end

Rails.application.routes.draw do
  resources :posts
end