Rails Controller Test with Rspec

Controller 테스트 범위

Controller의 CRUD 관련 매소드가 예상한것과 같이 동작한다.
CRUD외 다른 메소드가 예상한 것과 같이 동작한다.
nested attribute
nested routing

Controller method를 호출 하는 방법

<HTTP verb> <controller method name> <params>

get :index

get :edit, id: 1

get :show, id: 1

post :create, name: 'a', brand: 'b'

delete :destroy, id: 1

Controller method에서 선언된 변수에 접근하는 방법

assign(:variable)

expect(assign(:items)).to be [item1, item2]

Controller method로 부터 반환되는 값

response

expect(response).to redirect_to user_path
expect(response).to render_template :index

1. CRUD method test

a. GET Request

원하는 데이터가 instance variable에 제대로 할당되어야 한다.
액션에 맞는 템플릿을 렌더링하여야 한다.

Method : #index, #new, #edit, #show

describe'#show'do
    it "assigns the requested contact to @contact" do
        contact = create(:contact)
        get :show, id: contact
        expect(assigns(:contact)).to eq contact
    end
    it "renders the :show template" do
        contact = create(:contact)
        get :show, id: contact 
        expect(response).to render_template :show
    end 
end

b. POST request

valid parameter가 주어졌을 때
- Database에 새로운 record 생성
- 원하는 path로 redirect
- (옵션) Flash message 제대로 설정
invalid parameter가 주어졌을 때
- Database에 새로운 record를 생성하지 않음
- 원하는 contents rendering
- (옵션) Flash message 제대로 설정

describe '#create.html' do
  context "with valid attributes" do
    it "saves the new item into the database" do
      expect {
        post :create, item: attributes_for(:item)
        }.to change(Item, :count).by(1)
    end
    it "redirects to items#index" do
      post :create, item: attributes_for(:item)
      expect(response).to redirect_to items_path
    end
    it "sets flash message" do
      post :create, item: attributes_for(:item)
      expect(flash[:success]).to match("create")
    end
  end
  context "with invalid attributes" do
    it "does not save the new item into the database" do
      expect {
        post :create, item: attributes_for(:invalid_item)
      }.not_to change(Item, :count)
    end
    it "re-renders the :new template" do
      sub_menu = create(:sub_menu)
      post :create, item: attributes_for(:invalid_item)
      
      expect(response).to render_template :new
    end
  end

Ajax request

xhr :post, :create, item: attributes_for(:item)

status check

expect(response.status).to be(404)

c. PATCH request

1) valid attributes

requested object
DB update
redirect
Flash message (success)

2) invalid attributes

DB update (not changed)
render
Flash message (error)

업데이트된 record값을 다시 가져오기 : reload

describe 'update' do
  context "with valid attributes" do
    it "locates the requested @item" do
      patch :update, id: @item, item: attributes_for(:item)
      expect(assigns(:item)).to eq(@item)
    end
    it "changes @item's attributes" do
      patch :update, id: @item, item: attributes_for(:item, name: "!")
          
      @item.reload

      expect(@item.name).to eq "!"
    end
    it "redirects to item#index" do
      patch :update, id: @item, item: attributes_for(:item)
      expect(response).to redirect_to items_path
    end
  end
  context "with invalid attributes" do
    it "does not change the @item's attributes" do
      name = @item.name
      patch :update, id: @item, item: attributes_for(:invalid_item)
      expect(@item.reload.name).to eq(name)
    end
    it "re-renders the :edit template" do
      patch :update, id: @item, item: attributes_for(:invalid_item)
      expect(response).to render_template :edit
    end
    it 'sets flash message' do
      patch :update, id: @item, item: attributes_for(:invalid_item)
      expect(flash[:danger][:name]).not_to be_nil
    end
  end
end

d. DELETE request

잘 지워졌는
지우고나서 redirect

describe '#destroy' do
  it "deletes the item" do
    expect {
      delete :destroy, id: @item
    }.to change(Item, :count).by(-1)
  end
  it "redirects to item#index" do
    delete :destroy, id: @item
    expect(response).to redirect_to items_path
  end
end

###2. Non-CRUD method test ###3. Nested Attributes ###4. Nested Routes

Seonggwan Lee