Ruby on Rails操作正常，但测试失败

Question

我正在为我的训练营开展一个项目，我无法理解为什么测试失败但行动正常。测试：

describe "POST create" do
 it "increases the number of topics by 1" do
   expect{ post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph}}}.to change(Topic,:count).by(1)
 end

 it "assigns Topic.last to @topic" do
   post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph}}
   expect(assigns(:topic)).to eq Topic.last
 end

 it "redirects to the new topic" do
   post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph}}
   expect(response).to redirect_to Topic.last
 end
end

创建动作：

 def create
   @topic = Topic.new
   @topic.name = params[:topic][:name]
   @topic.description = params[:topic][:description]
   @topic.public = params[:topic][:public]

   if @topic.save
     redirect_to @topic, notice: "Topic was saved successfully."
   else
     flash.now[:alert] = "Error creating topic. Please try again."
     render :new
   end
 end

我查看我的测试：

rspec spec/controllers/topics_controller_spec.rb -e 'POST create'

我有三次失败。

Failures:
1) TopicsController POST create increases the number of topics by 1
 Failure/Error: expect{ post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph }}}.to change(Topic, :count).by(1)

 ArgumentError:
   unknown keyword: topic
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/template_assertions.rb:61:in `process'
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/integration.rb:12:in `block (2 levels) in <module:Integration>'
 # ./spec/controllers/topics_controller_spec.rb:54:in `block (4 levels) in <top (required)>'
 # ./spec/controllers/topics_controller_spec.rb:54:in `block (3 levels) in <top (required)>'

2) TopicsController POST create assigns Topic.last to @topic
 Failure/Error: post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph}}

 ArgumentError:
   unknown keyword: topic
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/template_assertions.rb:61:in `process'
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/integration.rb:12:in `block (2 levels) in <module:Integration>'
 # ./spec/controllers/topics_controller_spec.rb:58:in `block (3 levels) in <top (required)>'

3) TopicsController POST create redirects to new topic
 Failure/Error: post :create, {topic: {name: RandomData.random_sentence, description: RandomData.random_paragraph}}

 ArgumentError:
   unknown keyword: topic
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/template_assertions.rb:61:in `process'
 # /usr/local/rvm/gems/ruby-2.4.0/gems/rails-controller-testing-1.0.2/lib/rails/controller/testing/integration.rb:12:in `block (2 levels) in <module:Integration>'
 # ./spec/controllers/topics_controller_spec.rb:63:in `block (3 levels) in <top (required)>'

Finished in 0.02654 seconds (files took 2.16 seconds to load)
3 examples, 3 failures

Failed examples:
rspec ./spec/controllers/topics_controller_spec.rb:53 # TopicsController POST create increases the number of topics by 1
rspec ./spec/controllers/topics_controller_spec.rb:57 # TopicsController POST create assigns Topic.last to @topic
rspec ./spec/controllers/topics_controller_spec.rb:62 # TopicsController POST create redirects to new topic

该错误告诉我，未知关键字“topic”存在问题，但该关键字在我的topics_controller_spec.rb文件中的其他7个测试中运行正常。我一直盯着这个看了一个多小时，无法理解我出错的生活。

Answer 1

我想你选了一个旧例子。

您需要使用params键添加params。试试这个

describe "POST create" do
  it "increases the number of topics by 1" do
    expect{ post :create, params: {topic: ...} }.to change(Topic,:count).by(1)
  end
end