Add index action to Projects::BoardsController to return project boards

app/controllers/projects/boards_controller.rb

 class Projects::BoardsController < Projects::ApplicationController
   include IssuableCollections
-  
-  respond_to :html
 
-  before_action :authorize_read_board!, only: [:show]
+  before_action :authorize_read_board!, only: [:index, :show]
+
+  def index
+    @boards = ::Boards::ListService.new(project, current_user).execute
+
+    respond_to do |format|
+      format.html
+      format.json do
+        render json: @boards.as_json(only: [:id, :name])
+      end
+    end
+  end
 
   def show
     ::Boards::CreateService.new(project, current_user).execute

config/routes/project.rb

@@ -416,7 +416,7 @@ resources :namespaces, path: '/', constraints: { id: /[a-zA-Z.0-9_\-]+/ }, only:
         end
       end
 
-      resource :board, only: [:show] do
+      resources :boards, only: [:index, :show] do
         scope module: :boards do
           resources :issues, only: [:update]
 

spec/controllers/projects/boards_controller_spec.rb

@@ -9,6 +9,53 @@ describe Projects::BoardsController do
     sign_in(user)
   end
 
+  describe 'GET index' do
+    it 'creates a new project board when project does not have one' do
+      expect { list_boards }.to change(project.boards, :count).by(1)
+    end
+
+    context 'when format is HTML' do
+      it 'renders template' do
+        list_boards
+
+        expect(response).to render_template :index
+        expect(response.content_type).to eq 'text/html'
+      end
+    end
+
+    context 'when format is JSON' do
+      it 'returns a list of project boards' do
+        create_list(:board, 2, project: project)
+
+        list_boards format: :json
+
+        parsed_response = JSON.parse(response.body)
+
+        expect(response).to match_response_schema('boards')
+        expect(parsed_response.length).to eq 2
+      end
+    end
+
+    context 'with unauthorized user' do
+      before do
+        allow(Ability).to receive(:allowed?).with(user, :read_project, project).and_return(true)
+        allow(Ability).to receive(:allowed?).with(user, :read_board, project).and_return(false)
+      end
+
+      it 'returns a not found 404 response' do
+        list_boards
+
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    def list_boards(format: :html)
+      get :index, namespace_id: project.namespace.to_param,
+                  project_id: project.to_param,
+                  format: format
+    end
+  end
+
   describe 'GET show' do
     it 'creates a new board when project does not have one' do
       expect { read_board }.to change(Board, :count).by(1)

spec/fixtures/api/schemas/board.json

+{
+  "type": "object",
+  "required" : [
+    "id",
+    "name"
+  ],
+  "properties" : {
+    "id": { "type": "integer" },
+    "name": { "type": "string" }
+  },
+  "additionalProperties": false
+}

spec/fixtures/api/schemas/boards.json

+{
+  "type": "array",
+  "items": { "$ref": "board.json" }
+}