RSpec-Rails (基礎篇)(3): 撰寫controller測試

RSpec教學（基礎篇）全部內容

新增controller測試檔案

$ mkdir spec/controllers
$ touch spec/controllers/posts_spec.rb

/spec/controllers/posts_spec.rb

require 'rails_helper'

RSpec.describe PostsController, type: :controller do
    before(:all) do
        @post_1 = Post.create(title: "title_1", content: "content_1")
        @post_2 = Post.create(title: "title_2", content: "content_2")
    end

    it "#index" do
        get :index
        expect(response).to have_http_status(200)
        expect(response).to render_template(:index)
    end

    it "#new" do
        get :new
        expect(response).to have_http_status(200)
        expect(response).to render_template(:new)
    end

    it "#edit" do
        get :edit, id: @post_1[:id]
        expect(response).to have_http_status(200)
        expect(response).to render_template(:edit)
    end

    describe "#create" do
        before(:all) do
            @post_params = {title: "title", content: "content"}
        end

        it "creates record" do 
            expect{ post :create, post: @post_params }.to change{Post.all.size}.by(1)
        end

        it "redirect on success" do
            post :create, post: @post_params
            expect(response).not_to have_http_status(200)
            expect(response).to have_http_status(302)
            expect(response).to redirect_to(post_path(Post.last))
        end

        it "render :new on fail" do
            allow_any_instance_of(Post).to receive(:save).and_return(false)
            post :create, post: @post_params
            expect(response).not_to have_http_status(302)
            expect(response).to render_template(:new)
        end
    end

    describe "#update" do
        before(:all) do
            @post_params = {title: "title_3", content: "content"}
        end

        it "changes record" do 
            post :update, post: @post_params, id: @post_2[:id]
            expect(Post.find(@post_2[:id])[:title]).to eq("title_3")
        end

        it "redirect on success" do
            post :update, post: @post_params, id: @post_2[:id]
            expect(response).not_to have_http_status(200)
            expect(response).to have_http_status(302)
            expect(response).to redirect_to(post_path(Post.find(@post_2[:id])))
        end

        it "render :edit on fail" do
            allow_any_instance_of(Post).to receive(:update).and_return(false)
            post :update, post: @post_params, id: @post_2[:id]
            expect(response).not_to have_http_status(302)
            expect(response).to render_template(:edit)
        end
    end

    describe "#destroy" do
        before(:each) do
            @post_3 = @post_2 || Post.create(title: "title_3", content: "content_3")
        end

        it "destroy record" do
            expect{ delete :destroy, id: @post_3[:id] }.to change{Post.all.count}.by(-1)
        end 

        it "redirect_to index after destroy" do
            delete :destroy, id: @post_3[:id]
            expect(response).to have_http_status(302)
            expect(response).to redirect_to(posts_path)
        end
    end
end