Provide more feedback what went wrong if HipChat service failed test

Issue gitlab-com/support-forum#213

CHANGELOG

@@ -1,6 +1,7 @@
 Please view this file on the master branch, on stable branches it's out of date.
 
 v 7.14.0 (unreleased)
+  - Provide more feedback what went wrong if HipChat service failed test (Stan Hu)
   - Disable turbolinks when linking to Bitbucket import status (Stan Hu)
   - Fix broken code import and display error messages if something went wrong with creating project (Stan Hu)
   - Fix corrupted binary files when using API files endpoint (Stan Hu)

app/controllers/projects/services_controller.rb

@@ -39,10 +39,13 @@ class Projects::ServicesController < Projects::ApplicationController
 
   def test
     data = Gitlab::PushDataBuilder.build_sample(project, current_user)
-    if @service.execute(data)
+    outcome = @service.test(data)
+    if outcome[:success]
       message = { notice: 'We sent a request to the provided URL' }
     else
-      message = { alert: 'We tried to send a request to the provided URL but an error occured' }
+      error_message = "We tried to send a request to the provided URL but an error occurred"
+      error_message << ": #{outcome[:result]}" if outcome[:result].present?
+      message = { alert: error_message }
     end
 
     redirect_to :back, message

app/models/project_services/hipchat_service.rb

@@ -60,6 +60,16 @@ class HipchatService < Service
     gate[room].send('GitLab', message, message_options)
   end
 
+  def test(data)
+    begin
+      result = execute(data)
+    rescue StandardError => error
+      return { success: false, result: error }
+    end
+
+    { success: true, result: result }
+  end
+
   private
 
   def gate

app/models/service.rb

@@ -87,10 +87,16 @@ class Service < ActiveRecord::Base
     %w(push tag_push issue merge_request)
   end
 
-  def execute
+  def execute(data)
     # implement inside child
   end
 
+  def test(data)
+    # default implementation
+    result = execute(data)
+    { success: result.present?, result: result }
+  end
+
   def can_test?
     !project.empty_repo?
   end

spec/controllers/projects/services_controller_spec.rb

@@ -0,0 +1,35 @@
+require 'spec_helper'
+
+describe Projects::ServicesController do
+  let(:project) { create(:project) }
+  let(:user)    { create(:user) }
+  let(:service) { create(:service, project: project) }
+
+  before do
+    sign_in(user)
+    project.team << [user, :master]
+    controller.instance_variable_set(:@project, project)
+    controller.instance_variable_set(:@service, service)
+    request.env["HTTP_REFERER"] = "/"
+  end
+
+  describe "#test" do
+    context 'success' do
+      it "should redirect and show success message" do
+        expect(service).to receive(:test).and_return({ success: true, result: 'done' })
+        get :test, namespace_id: project.namespace.id, project_id: project.id, id: service.id, format: :html
+        expect(response.status).to redirect_to('/')
+        expect(flash[:notice]).to eq('We sent a request to the provided URL')
+      end
+    end
+
+    context 'failure' do
+      it "should redirect and show failure message" do
+        expect(service).to receive(:test).and_return({ success: false, result: 'Bad test' })
+        get :test, namespace_id: project.namespace.id, project_id: project.id, id: service.id, format: :html
+        expect(response.status).to redirect_to('/')
+        expect(flash[:alert]).to eq('We tried to send a request to the provided URL but an error occurred: Bad test')
+      end
+    end
+  end
+end

spec/models/project_services/hipchat_service_spec.rb

@@ -47,6 +47,14 @@ describe HipchatService do
       WebMock.stub_request(:post, api_url)
     end
 
+    it 'should test and return errors' do
+      allow(hipchat).to receive(:execute).and_raise(StandardError, 'no such room')
+      result = hipchat.test(push_sample_data)
+
+      expect(result[:success]).to be_falsey
+      expect(result[:result].to_s).to eq('no such room')
+    end
+
     it 'should use v1 if version is provided' do
       allow(hipchat).to receive(:api_version).and_return('v1')
       expect(HipChat::Client).to receive(:new).

spec/models/service_spec.rb

@@ -46,6 +46,16 @@ describe Service do
       describe :can_test do
         it { expect(@testable).to eq(true) }
       end
+
+      describe :test do
+        let(:data) { 'test' }
+
+        it 'test runs execute' do
+          expect(@service).to receive(:execute).with(data)
+
+          @service.test(data)
+        end
+      end
     end
 
     describe "With commits" do