Only show one board when there are multiple

And show a mention to the users so they know their boards didn't
disappear.

app/services/boards/list_service.rb

 module Boards
   class ListService < BaseService
+    prepend EE::Boards::ListService
+
     def execute
       create_board! if project.boards.empty?
       project.boards

app/services/ee/boards/list_service.rb

+module EE
+  module Boards
+    module ListService
+      def execute
+        raise NotImplementedError unless defined?(super)
+
+        if project.feature_available?(:multiple_issue_boards, current_user)
+          super
+        else
+          super.limit(1)
+        end
+      end
+    end
+  end
+end

app/views/projects/boards/_switcher.html.haml

@@ -22,6 +22,9 @@
           %li{ "v-for" => "board in boards" }
             %a{ ":href" => "'#{project_boards_path(@project)}/' + board.id" }
               {{ board.name }}
+          - if !@project.feature_available?(:multiple_issue_boards) && @project.boards.size > 1
+            %li.small
+              Some of your boards are hidden, activate a license to see them again.
       .dropdown-loading{ "v-if" => "loading" }
         = icon("spin spinner")
       - if can?(current_user, :admin_board, @project)
@@ -47,7 +50,6 @@
               %li
                 %a{ "href" => "#", "@click.stop.prevent" => "showPage('new')" }
                   Create new board
-
             %li
               %a{ "href" => "#", "@click.stop.prevent" => "showPage('edit')" }
                 Edit board name

spec/features/boards/multiple_boards_spec.rb

@@ -169,19 +169,30 @@ describe 'Multiple Issue Boards', feature: true, js: true do
       project.team << [user, :master]
 
       login_as(user)
+    end
 
+    it 'hides the link to create a new board' do
       visit project_boards_path(project)
       wait_for_requests
-    end
 
-    it 'hides the link to create a new board' do
       click_button board.name
 
       page.within('.dropdown-menu') do
         expect(page).to have_content('Edit board name')
         expect(page).not_to have_content('Create new board')
-        expect(page).to have_content('Delete board')
+        expect(page).not_to have_content('Delete board')
+      end
     end
+
+    it 'shows a mention that boards are hidden when multiple boards are created' do
+      create(:board, project: project)
+
+      visit project_boards_path(project)
+      wait_for_requests
+
+      click_button board.name
+
+      expect(page).to have_content('Some of your boards are hidden, activate a license to see them again.')
     end
   end
 end

spec/services/ee/boards/list_service_spec.rb

+require 'spec_helper'
+
+describe Boards::ListService do
+  let(:project) { create(:empty_project) }
+  let(:service) { described_class.new(project, double) }
+
+  before do
+    create_list(:board, 2, project: project)
+  end
+
+  describe '#execute' do
+    it 'returns all issue boards when `multiple_issue_boards` is enabled' do
+      stub_licensed_features(multiple_issue_boards: true)
+
+      expect(service.execute.size).to eq(2)
+    end
+
+    it 'returns the first issue board when `multiple_issue_boards` is disabled' do
+      stub_licensed_features(multiple_issue_boards: false)
+
+      expect(service.execute.size).to eq(1)
+    end
+  end
+end