Change API ping/pong to return a boolean

app/controllers/api/application_controller.rb

@@ -29,7 +29,7 @@ module API
     end
 
     def ping
-      render json: { pong: 'ok' }
+      render json: { pong: true }
     end
 
     def authenticate!

spec/integration/api/application_spec.rb

@@ -3,7 +3,7 @@ describe 'API application' do
     before { get api_ping_path, format: :json }
 
     it 'responds with a pong' do
-      expect(json).to eq(pong: 'ok')
+      expect(json).to eq(pong: true)
     end
   end