ActionController::UrlGenerationError:没有匹配的路由(Rspec)

# config/routes.rb
Rails.application.routes.draw do
  get '/example', to: 'examples#index'
end

# app/controllers/examples_controller.rb
class ExamplesController < ApplicationController
  def index
    # 动作逻辑
  end
end

# spec/controllers/examples_controller_spec.rb
RSpec.describe ExamplesController, type: :controller do
  describe 'GET #index' do
    it 'responds successfully with an HTTP 200 status code' do
      get :index
      expect(response).to be_successful
      expect(response).to have_http_status(200)
    end
  end
end

# config/routes.rb
Rails.application.routes.draw do
  get '/user/:id', to: 'users#show', constraints: { id: /\d+/ }
end

# config/routes.rb
Rails.application.routes.draw do
  resources :users, only: [:show]
end

# app/controllers/users_controller.rb
class UsersController < ApplicationController
  def show
    @user = User.find(params[:id])
  end
end

# spec/controllers/users_controller_spec.rb
RSpec.describe UsersController, type: :controller do
  describe 'GET #show' do
    it 'assigns the requested user to @user' do
      user = create(:user)
      get :show, params: { id: user.id }
      expect(assigns(:user)).to eq(user)
    end

    it 'renders the :show template' do
      user = create(:user)
      get :show, params: { id: user.id }
      expect(response).to render_template(:show)
    end
  end
end