added cycle analytics events controller and started integration spec

app/controllers/projects/cycle_analytics/events_controller.rb

+class Projects::CycleAnalytics::EventsController < Projects::ApplicationController
+  #before_action :authorize_read_cycle_analytics!
+
+  def issues
+    respond_to do |format|
+      format.html
+      format.json { render json: events.issue_events }
+    end
+  end
+
+  private
+
+  # TODO refactor this
+  def start_date
+    case events_params[:start_date]
+      when '30' then
+        30.days.ago
+      when '90' then
+        90.days.ago
+      else
+        90.days.ago
+    end
+  end
+
+  def events
+    @events ||= Gitlab::CycleAnalytics::Events.new(project: project, from: start_date)
+  end
+
+  def events_params
+    return {} unless params[:events].present?
+
+    { start_date: params[:events][:start_date] }
+  end
+end
\ No newline at end of file

config/routes/project.rb

@@ -153,6 +153,12 @@ resources :namespaces, path: '/', constraints: { id: /[a-zA-Z.0-9_\-]+/ }, only:
 
       resource :cycle_analytics, only: [:show]
 
+      namespace :cycle_analytics do
+        scope :events, controller: '/projects/cycle_analytics/events' do
+          get :issues
+        end
+      end
+
       resources :builds, only: [:index, :show], constraints: { id: /\d+/ } do
         collection do
           post :cancel_all

spec/requests/projects/cycle_analytics_events_spec.rb

+require 'spec_helper'
+
+describe 'cycle analytics events' do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+
+  describe 'GET /:namespace/:project/cycle_analytics/events/issues' do
+    before do
+      project.team << [user, :developer]
+
+      login_as(user)
+    end
+
+    it 'lists the issue events' do
+      get namespace_project_cycle_analytics_issues_path(project.namespace, project, format: :json)
+
+      expect(json_response).to eq ([])
+    end
+  end
+
+  def json_response
+    JSON.parse(response.body)
+  end
+end