Rails单元测试：为什么没有路线匹配？

Question

我正在尝试进行一些单元测试，这是我第一次。

我真的不明白为什么No route matches 。

当我运行$ rake test test/controllers/products_controller_test.rb

我在控制台的输出中得到这个：

1) Error:
ProductsControllerTest#test_should_get_edit:
ActionController::UrlGenerationError: No route matches {:action=>"edit", :controller=>"products"}
    test/controllers/products_controller_test.rb:20:in `block in <class:ProductsControllerTest>'


  2) Error:
ProductsControllerTest#test_should_get_show:
ActionController::UrlGenerationError: No route matches {:action=>"show", :controller=>"products"}
    test/controllers/products_controller_test.rb:35:in `block in <class:ProductsControllerTest>'


  3) Error:
ProductsControllerTest#test_should_get_create:
ActionController::ParameterMissing: param is missing or the value is empty: product
    app/controllers/products_controller.rb:59:in 'product_params'
    app/controllers/products_controller.rb:18:in 'create'
    test/controllers/products_controller_test.rb:15:in `block in <class:ProductsControllerTest>'


  4) Error:
ProductsControllerTest#test_should_get_update:
ActionController::UrlGenerationError: No route matches {:action=>"update", :controller=>"products"}
    test/controllers/products_controller_test.rb:25:in `block in <class:ProductsControllerTest>'


  5) Error:
ProductsControllerTest#test_should_get_destroy:
ActionController::UrlGenerationError: No route matches {:action=>"destroy", :controller=>"products"}
    test/controllers/products_controller_test.rb:30:in `block in <class:ProductsControllerTest>'

7 runs, 2 assertions, 0 failures, 5 errors, 0 skips

---

这是products_controller_test.rb文件：

require 'test_helper'

class ProductsControllerTest < ActionController::TestCase
  test "should get index" do
    get :index
    assert_response :success
  end

  test "should get new" do
    get :new
    assert_response :success
  end

  test "should get create" do
    get :create
    assert_response :success
  end

  test "should get edit" do
    get :edit
    assert_response :success
  end

  test "should get update" do
    get :update
    assert_response :success
  end

  test "should get destroy" do
    get :destroy
    assert_response :success
  end

  test "should get show" do
    get :show
    assert_response :success
  end

end

---

route.rb文件：

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

Answer 1

对于所有这些路线（编辑，更新，销毁），您需要说出您要编辑/更新/销毁哪种产品。 如果Rails不知道，它将无法为您绘制路线。

例如，对于编辑而言，完整路径为products/:product_id/edit 。 因此，Rails将需要“填写”：product_id键。 如果将其保留为空白，则路由中断。

然后，在代码中，如果要调用get :edit ，则需要指定一个产品ID。 像这样：

get :edit, product_id: products(:test_product).id

（使用此处的Rails测试教程中介绍的固定装置）