Add a basic railtie integration test for Active Storage

Author: zzak

railties/test/application/active_storage/uploads_integration_test.rb

@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
+require "rack/test"
+require "rails-dom-testing"
+
+module ApplicationTests
+  class UploadsIntegrationTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+    include Rack::Test::Methods
+    include Rails::Dom::Testing::Assertions
+
+    self.file_fixture_path = "#{RAILS_FRAMEWORK_ROOT}/activestorage/test/fixtures/files"
+
+    def setup
+      build_app
+    end
+
+    def teardown
+      teardown_app
+    end
+
+    def test_creating_new_upload
+      rails "active_storage:install"
+
+      rails "generate", "model", "user", "name:string", "avatar:attachment"
+      rails "db:migrate"
+
+      app_file "config/routes.rb", <<~RUBY
+        Rails.application.routes.draw do
+          resources :users, only: [:show, :create]
+        end
+      RUBY
+
+      app_file "app/controllers/users_controller.rb", <<~RUBY
+        class UsersController < ApplicationController
+          def show
+            @user = User.find(params[:id])
+            render :show
+          end
+
+          def create
+            @user = User.new(user_params)
+
+            if @user.save
+              redirect_to user_url(@user), notice: "User was successfully created."
+            else
+              render :new, status: :unprocessable_entity
+            end
+          end
+
+          private
+            def user_params
+              params.require(:user).permit(:name, :avatar)
+            end
+        end
+      RUBY
+
+      app_file "app/views/users/show.html.erb", <<~ERB
+        <p><%= @user.name %></p>
+        <p><%= image_tag @user.avatar %></p>
+      ERB
+
+      app("development")
+
+      post "/users", user: { name: "zomg", avatar: Rack::Test::UploadedFile.new(file_fixture("racecar.jpg")) }
+      assert_equal 302, last_response.status
+
+      get "/users/1"
+      assert_equal 200, last_response.status
+      assert_select "p", text: "zomg"
+      assert_select "img", count: 1
+    end
+
+    private
+      def document_root_element
+        Nokogiri::HTML5.parse(last_response.body)
+      end
+  end
+end