Merge branch 'feature/cycle-analytics-events' into 'master'

Cycle Analytics: Events per stage

Adds list of events to each stage:

- Issue: list of issues created in the last XX days, that have been labeled or added to a milestone.
- Plan: list of commits that reference for the fist time an issue from the last stage.
- Code: list of MR created in this stage
- Test: List of unique builds triggered by the commits.
- Review: List of MR merged
- Staging: List of deployed builds
- Production: list of issues with the time from idea to production

Fixes #23449 

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !6859

56 files changed, 1679 insertions, 86 deletions

diff --git a/app/controllers/concerns/cycle_analytics_params.rb b/app/controllers/concerns/cycle_analytics_params.rb
new file mode 100644
index 00000000000..2aaf8f2b451
--- /dev/null
+++ b/app/controllers/concerns/cycle_analytics_params.rb
@@ -0,0 +1,7 @@
+module CycleAnalyticsParams
+  extend ActiveSupport::Concern
+
+  def start_date(params)
+    params[:start_date] == '30' ? 30.days.ago : 90.days.ago
+  end
+end
diff --git a/app/controllers/projects/cycle_analytics/events_controller.rb b/app/controllers/projects/cycle_analytics/events_controller.rb
new file mode 100644
index 00000000000..13b3eec761f
--- /dev/null
+++ b/app/controllers/projects/cycle_analytics/events_controller.rb
@@ -0,0 +1,65 @@
+module Projects
+  module CycleAnalytics
+    class EventsController < Projects::ApplicationController
+      include CycleAnalyticsParams
+    
+      before_action :authorize_read_cycle_analytics!
+      before_action :authorize_read_build!, only: [:test, :staging]
+      before_action :authorize_read_issue!, only: [:issue, :production]
+      before_action :authorize_read_merge_request!, only: [:code, :review]
+
+      def issue
+        render_events(events.issue_events)
+      end
+    
+      def plan
+        render_events(events.plan_events)
+      end
+    
+      def code
+        render_events(events.code_events)
+      end
+    
+      def test
+        options[:branch] = events_params[:branch_name]
+    
+        render_events(events.test_events)
+      end
+    
+      def review
+        render_events(events.review_events)
+      end
+    
+      def staging
+        render_events(events.staging_events)
+      end
+    
+      def production
+        render_events(events.production_events)
+      end
+    
+      private
+    
+      def render_events(events_list)
+        respond_to do |format|
+          format.html
+          format.json { render json: { events: events_list } }
+        end
+      end
+    
+      def events
+        @events ||= Gitlab::CycleAnalytics::Events.new(project: project, options: options)
+      end
+    
+      def options
+        @options ||= { from: start_date(events_params), current_user: current_user }
+      end
+    
+      def events_params
+        return {} unless params[:events].present?
+    
+        params[:events].slice(:start_date, :branch_name)
+      end
+    end
+  end
+end
diff --git a/app/controllers/projects/cycle_analytics_controller.rb b/app/controllers/projects/cycle_analytics_controller.rb
index 16a7b1fc6e2..96eb75a0547 100644
--- a/app/controllers/projects/cycle_analytics_controller.rb
+++ b/app/controllers/projects/cycle_analytics_controller.rb
@@ -1,11 +1,12 @@
 class Projects::CycleAnalyticsController < Projects::ApplicationController
   include ActionView::Helpers::DateHelper
   include ActionView::Helpers::TextHelper
+  include CycleAnalyticsParams
 
   before_action :authorize_read_cycle_analytics!
 
   def show
-    @cycle_analytics = CycleAnalytics.new(@project, from: parse_start_date)
+    @cycle_analytics = ::CycleAnalytics.new(@project, from: start_date(cycle_analytics_params))
 
     respond_to do |format|
       format.html
@@ -15,14 +16,6 @@ class Projects::CycleAnalyticsController < Projects::ApplicationController
 
   private
 
-  def parse_start_date
-    case cycle_analytics_params[:start_date]
-    when '30' then 30.days.ago
-    when '90' then 90.days.ago
-    else 90.days.ago
-    end
-  end
-
   def cycle_analytics_params
     return {} unless params[:cycle_analytics].present?
 
diff --git a/app/models/cycle_analytics.rb b/app/models/cycle_analytics.rb
index 8ed4a56b19b..314a1ce9b63 100644
--- a/app/models/cycle_analytics.rb
+++ b/app/models/cycle_analytics.rb
@@ -1,12 +1,8 @@
 class CycleAnalytics
-  include Gitlab::Database::Median
-  include Gitlab::Database::DateTime
-
-  DEPLOYMENT_METRIC_STAGES = %i[production staging]
-
   def initialize(project, from:)
     @project = project
     @from = from
+    @fetcher = Gitlab::CycleAnalytics::MetricsFetcher.new(project: project, from: from, branch: nil)
   end
 
   def summary
@@ -14,90 +10,46 @@ class CycleAnalytics
   end
 
   def issue
-    calculate_metric(:issue,
+    @fetcher.calculate_metric(:issue,
                      Issue.arel_table[:created_at],
                      [Issue::Metrics.arel_table[:first_associated_with_milestone_at],
                       Issue::Metrics.arel_table[:first_added_to_board_at]])
   end
 
   def plan
-    calculate_metric(:plan,
+    @fetcher.calculate_metric(:plan,
                      [Issue::Metrics.arel_table[:first_associated_with_milestone_at],
                       Issue::Metrics.arel_table[:first_added_to_board_at]],
                      Issue::Metrics.arel_table[:first_mentioned_in_commit_at])
   end
 
   def code
-    calculate_metric(:code,
+    @fetcher.calculate_metric(:code,
                      Issue::Metrics.arel_table[:first_mentioned_in_commit_at],
                      MergeRequest.arel_table[:created_at])
   end
 
   def test
-    calculate_metric(:test,
+    @fetcher.calculate_metric(:test,
                      MergeRequest::Metrics.arel_table[:latest_build_started_at],
                      MergeRequest::Metrics.arel_table[:latest_build_finished_at])
   end
 
   def review
-    calculate_metric(:review,
+    @fetcher.calculate_metric(:review,
                      MergeRequest.arel_table[:created_at],
                      MergeRequest::Metrics.arel_table[:merged_at])
   end
 
   def staging
-    calculate_metric(:staging,
+    @fetcher.calculate_metric(:staging,
                      MergeRequest::Metrics.arel_table[:merged_at],
                      MergeRequest::Metrics.arel_table[:first_deployed_to_production_at])
   end
 
   def production
-    calculate_metric(:production,
+    @fetcher.calculate_metric(:production,
                      Issue.arel_table[:created_at],
                      MergeRequest::Metrics.arel_table[:first_deployed_to_production_at])
   end
-
-  private
-
-  def calculate_metric(name, start_time_attrs, end_time_attrs)
-    cte_table = Arel::Table.new("cte_table_for_#{name}")
-
-    # Build a `SELECT` query. We find the first of the `end_time_attrs` that isn't `NULL` (call this end_time).
-    # Next, we find the first of the start_time_attrs that isn't `NULL` (call this start_time).
-    # We compute the (end_time - start_time) interval, and give it an alias based on the current
-    # cycle analytics stage.
-    interval_query = Arel::Nodes::As.new(
-      cte_table,
-      subtract_datetimes(base_query_for(name), end_time_attrs, start_time_attrs, name.to_s))
-
-    median_datetime(cte_table, interval_query, name)
-  end
-
-  # Join table with a row for every <issue,merge_request> pair (where the merge request
-  # closes the given issue) with issue and merge request metrics included. The metrics
-  # are loaded with an inner join, so issues / merge requests without metrics are
-  # automatically excluded.
-  def base_query_for(name)
-    arel_table = MergeRequestsClosingIssues.arel_table
-
-    # Load issues
-    query = arel_table.join(Issue.arel_table).on(Issue.arel_table[:id].eq(arel_table[:issue_id])).
-            join(Issue::Metrics.arel_table).on(Issue.arel_table[:id].eq(Issue::Metrics.arel_table[:issue_id])).
-            where(Issue.arel_table[:project_id].eq(@project.id)).
-            where(Issue.arel_table[:deleted_at].eq(nil)).
-            where(Issue.arel_table[:created_at].gteq(@from))
-
-    # Load merge_requests
-    query = query.join(MergeRequest.arel_table, Arel::Nodes::OuterJoin).
-            on(MergeRequest.arel_table[:id].eq(arel_table[:merge_request_id])).
-            join(MergeRequest::Metrics.arel_table).
-            on(MergeRequest.arel_table[:id].eq(MergeRequest::Metrics.arel_table[:merge_request_id]))
-
-    if DEPLOYMENT_METRIC_STAGES.include?(name)
-      # Limit to merge requests that have been deployed to production after `@from`
-      query.where(MergeRequest::Metrics.arel_table[:first_deployed_to_production_at].gteq(@from))
-    end
-
-    query
-  end
 end
diff --git a/app/models/merge_request/metrics.rb b/app/models/merge_request/metrics.rb
index 99c49a020c9..cdc408738be 100644
--- a/app/models/merge_request/metrics.rb
+++ b/app/models/merge_request/metrics.rb
@@ -1,5 +1,6 @@
 class MergeRequest::Metrics < ActiveRecord::Base
   belongs_to :merge_request
+  belongs_to :pipeline, class_name: 'Ci::Pipeline', foreign_key: :pipeline_id
 
   def record!
     if merge_request.merged? && self.merged_at.blank?
diff --git a/app/serializers/analytics_build_entity.rb b/app/serializers/analytics_build_entity.rb
new file mode 100644
index 00000000000..5fdf2bbf7c3
--- /dev/null
+++ b/app/serializers/analytics_build_entity.rb
@@ -0,0 +1,40 @@
+class AnalyticsBuildEntity < Grape::Entity
+  include RequestAwareEntity
+  include EntityDateHelper
+
+  expose :name
+  expose :id
+  expose :ref, as: :branch
+  expose :short_sha
+  expose :author, using: UserEntity
+
+  expose :started_at, as: :date do |build|
+    interval_in_words(build[:started_at])
+  end
+
+  expose :duration, as: :total_time do |build|
+    distance_of_time_as_hash(build[:duration].to_f)
+  end
+
+  expose :branch do
+    expose :ref, as: :name
+
+    expose :url do |build|
+      url_to(:namespace_project_tree, build, build.ref)
+    end
+  end
+
+  expose :url do |build|
+    url_to(:namespace_project_build, build)
+  end
+
+  expose :commit_url do |build|
+    url_to(:namespace_project_commit, build, build.sha)
+  end
+
+  private
+
+  def url_to(route, build, id = nil)
+    public_send("#{route}_url", build.project.namespace, build.project, id || build)
+  end
+end
diff --git a/app/serializers/analytics_build_serializer.rb b/app/serializers/analytics_build_serializer.rb
new file mode 100644
index 00000000000..f172d67d356
--- /dev/null
+++ b/app/serializers/analytics_build_serializer.rb
@@ -0,0 +1,3 @@
+class AnalyticsBuildSerializer < BaseSerializer
+  entity AnalyticsBuildEntity
+end
diff --git a/app/serializers/analytics_commit_entity.rb b/app/serializers/analytics_commit_entity.rb
new file mode 100644
index 00000000000..402cecbfd08
--- /dev/null
+++ b/app/serializers/analytics_commit_entity.rb
@@ -0,0 +1,13 @@
+class AnalyticsCommitEntity < CommitEntity
+  include EntityDateHelper
+
+  expose :short_id, as: :short_sha
+
+  expose :total_time do |commit|
+    distance_of_time_as_hash(request.total_time.to_f)
+  end
+
+  unexpose :author_name
+  unexpose :author_email
+  unexpose :message
+end
diff --git a/app/serializers/analytics_commit_serializer.rb b/app/serializers/analytics_commit_serializer.rb
new file mode 100644
index 00000000000..cdbfecf2b70
--- /dev/null
+++ b/app/serializers/analytics_commit_serializer.rb
@@ -0,0 +1,3 @@
+class AnalyticsCommitSerializer < BaseSerializer
+  entity AnalyticsCommitEntity
+end
diff --git a/app/serializers/analytics_generic_serializer.rb b/app/serializers/analytics_generic_serializer.rb
new file mode 100644
index 00000000000..9f4859e8410
--- /dev/null
+++ b/app/serializers/analytics_generic_serializer.rb
@@ -0,0 +1,7 @@
+class AnalyticsGenericSerializer < BaseSerializer
+  def represent(resource, opts = {})
+    resource.symbolize_keys!
+
+    super(resource, opts)
+  end
+end
diff --git a/app/serializers/analytics_issue_entity.rb b/app/serializers/analytics_issue_entity.rb
new file mode 100644
index 00000000000..44c50f18613
--- /dev/null
+++ b/app/serializers/analytics_issue_entity.rb
@@ -0,0 +1,29 @@
+class AnalyticsIssueEntity < Grape::Entity
+  include RequestAwareEntity
+  include EntityDateHelper
+
+  expose :title
+  expose :author, using: UserEntity
+
+  expose :iid do |object|
+    object[:iid].to_s
+  end
+
+  expose :total_time do |object|
+    distance_of_time_as_hash(object[:total_time].to_f)
+  end
+
+  expose(:created_at) do |object|
+    interval_in_words(object[:created_at])
+  end
+
+  expose :url do |object|
+    url_to(:namespace_project_issue, id: object[:iid].to_s)
+  end
+
+  private
+
+  def url_to(route, id)
+    public_send("#{route}_url", request.project.namespace, request.project, id)
+  end
+end
diff --git a/app/serializers/analytics_issue_serializer.rb b/app/serializers/analytics_issue_serializer.rb
new file mode 100644
index 00000000000..4fb3e8f1bb4
--- /dev/null
+++ b/app/serializers/analytics_issue_serializer.rb
@@ -0,0 +1,3 @@
+class AnalyticsIssueSerializer < AnalyticsGenericSerializer
+  entity AnalyticsIssueEntity
+end
diff --git a/app/serializers/analytics_merge_request_entity.rb b/app/serializers/analytics_merge_request_entity.rb
new file mode 100644
index 00000000000..888265eaa38
--- /dev/null
+++ b/app/serializers/analytics_merge_request_entity.rb
@@ -0,0 +1,7 @@
+class AnalyticsMergeRequestEntity < AnalyticsIssueEntity
+  expose :state
+
+  expose :url do |object|
+    url_to(:namespace_project_merge_request, id: object[:iid].to_s)
+  end
+end
diff --git a/app/serializers/analytics_merge_request_serializer.rb b/app/serializers/analytics_merge_request_serializer.rb
new file mode 100644
index 00000000000..4622a1dd855
--- /dev/null
+++ b/app/serializers/analytics_merge_request_serializer.rb
@@ -0,0 +1,3 @@
+class AnalyticsMergeRequestSerializer < AnalyticsGenericSerializer
+  entity AnalyticsMergeRequestEntity
+end
diff --git a/app/serializers/entity_date_helper.rb b/app/serializers/entity_date_helper.rb
new file mode 100644
index 00000000000..b333b3344c3
--- /dev/null
+++ b/app/serializers/entity_date_helper.rb
@@ -0,0 +1,35 @@
+module EntityDateHelper
+  include ActionView::Helpers::DateHelper
+
+  def interval_in_words(diff)
+    "#{distance_of_time_in_words(diff.to_f)} ago"
+  end
+
+  # Converts seconds into a hash such as:
+  # { days: 1, hours: 3, mins: 42, seconds: 40 }
+  #
+  # It returns 0 seconds for zero or negative numbers
+  # It rounds to nearest time unit and does not return zero
+  # i.e { min: 1 } instead of { mins: 1, seconds: 0 }
+  def distance_of_time_as_hash(diff)
+    diff = diff.abs.floor
+
+    return { seconds: 0 } if diff == 0
+
+    mins = (diff / 60).floor
+    seconds = diff % 60
+    hours = (mins / 60).floor
+    mins = mins % 60
+    days = (hours / 24).floor
+    hours = hours % 24
+
+    duration_hash = {}
+
+    duration_hash[:days] = days if days > 0
+    duration_hash[:hours] = hours if hours > 0
+    duration_hash[:mins] = mins if mins > 0
+    duration_hash[:seconds] = seconds if seconds > 0
+
+    duration_hash
+  end
+end
diff --git a/app/workers/pipeline_metrics_worker.rb b/app/workers/pipeline_metrics_worker.rb
index 34f6ef161fb..070943f1ecc 100644
--- a/app/workers/pipeline_metrics_worker.rb
+++ b/app/workers/pipeline_metrics_worker.rb
@@ -12,11 +12,11 @@ class PipelineMetricsWorker
   private
 
   def update_metrics_for_active_pipeline(pipeline)
-    metrics(pipeline).update_all(latest_build_started_at: pipeline.started_at, latest_build_finished_at: nil)
+    metrics(pipeline).update_all(latest_build_started_at: pipeline.started_at, latest_build_finished_at: nil, pipeline_id: pipeline.id)
   end
 
   def update_metrics_for_succeeded_pipeline(pipeline)
-    metrics(pipeline).update_all(latest_build_started_at: pipeline.started_at, latest_build_finished_at: pipeline.finished_at)
+    metrics(pipeline).update_all(latest_build_started_at: pipeline.started_at, latest_build_finished_at: pipeline.finished_at, pipeline_id: pipeline.id)
   end
 
   def metrics(pipeline)
diff --git a/changelogs/unreleased/feature-cycle-analytics-events.yml b/changelogs/unreleased/feature-cycle-analytics-events.yml
new file mode 100644
index 00000000000..e1211a3c774
--- /dev/null
+++ b/changelogs/unreleased/feature-cycle-analytics-events.yml
@@ -0,0 +1,4 @@
+---
+title: Add events per stage to cycle analytics
+merge_request: 
+author: 
diff --git a/config/routes/project.rb b/config/routes/project.rb
index 9cf8465dca8..d6eae1c9fce 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -153,6 +153,18 @@ resources :namespaces, path: '/', constraints: { id: /[a-zA-Z.0-9_\-]+/ }, only:
 
       resource :cycle_analytics, only: [:show]
 
+      namespace :cycle_analytics do
+        scope :events, controller: 'events' do
+          get :issue
+          get :plan
+          get :code
+          get :test
+          get :review
+          get :staging
+          get :production
+        end
+      end
+
       resources :builds, only: [:index, :show], constraints: { id: /\d+/ } do
         collection do
           post :cancel_all
diff --git a/db/fixtures/development/17_cycle_analytics.rb b/db/fixtures/development/17_cycle_analytics.rb
index e882a492757..916ee8dbac8 100644
--- a/db/fixtures/development/17_cycle_analytics.rb
+++ b/db/fixtures/development/17_cycle_analytics.rb
@@ -203,6 +203,8 @@ class Gitlab::Seeder::CycleAnalytics
       pipeline.run!
       Timecop.travel rand(1..6).hours.from_now
       pipeline.succeed!
+
+      PipelineMetricsWorker.new.perform(pipeline.id)
     end
   end
 
diff --git a/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb b/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb
new file mode 100644
index 00000000000..ed53756cd24
--- /dev/null
+++ b/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb
@@ -0,0 +1,31 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddPipelineIdToMergeRequestMetrics < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = true
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  DOWNTIME_REASON = 'Adding a foreign key'
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  # disable_ddl_transaction!
+
+  def change
+    add_column :merge_request_metrics, :pipeline_id, :integer
+    add_concurrent_index :merge_request_metrics, :pipeline_id
+    add_foreign_key :merge_request_metrics, :ci_commits, column: :pipeline_id, on_delete: :cascade
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 9382f8adc4d..19bd6b63acb 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -649,10 +649,12 @@ ActiveRecord::Schema.define(version: 20161117114805) do
     t.datetime "merged_at"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.integer "pipeline_id"
   end
 
   add_index "merge_request_metrics", ["first_deployed_to_production_at"], name: "index_merge_request_metrics_on_first_deployed_to_production_at", using: :btree
   add_index "merge_request_metrics", ["merge_request_id"], name: "index_merge_request_metrics", using: :btree
+  add_index "merge_request_metrics", ["pipeline_id"], name: "index_merge_request_metrics_on_pipeline_id", using: :btree
 
   create_table "merge_requests", force: :cascade do |t|
     t.string "target_branch", null: false
@@ -1260,6 +1262,7 @@ ActiveRecord::Schema.define(version: 20161117114805) do
   add_foreign_key "labels", "namespaces", column: "group_id", on_delete: :cascade
   add_foreign_key "lists", "boards"
   add_foreign_key "lists", "labels"
+  add_foreign_key "merge_request_metrics", "ci_commits", column: "pipeline_id", on_delete: :cascade
   add_foreign_key "merge_request_metrics", "merge_requests", on_delete: :cascade
   add_foreign_key "merge_requests_closing_issues", "issues", on_delete: :cascade
   add_foreign_key "merge_requests_closing_issues", "merge_requests", on_delete: :cascade
diff --git a/lib/gitlab/cycle_analytics/base_event.rb b/lib/gitlab/cycle_analytics/base_event.rb
new file mode 100644
index 00000000000..486139b1687
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/base_event.rb
@@ -0,0 +1,57 @@
+module Gitlab
+  module CycleAnalytics
+    class BaseEvent
+      include MetricsTables
+
+      attr_reader :stage, :start_time_attrs, :end_time_attrs, :projections, :query
+
+      def initialize(project:, options:)
+        @query = EventsQuery.new(project: project, options: options)
+        @project = project
+        @options = options
+      end
+
+      def fetch
+        update_author!
+
+        event_result.map do |event|
+          serialize(event) if has_permission?(event['id'])
+        end
+      end
+
+      def custom_query(_base_query); end
+
+      def order
+        @order || @start_time_attrs
+      end
+
+      private
+
+      def update_author!
+        return unless event_result.any? && event_result.first['author_id']
+
+        Updater.update!(event_result, from: 'author_id', to: 'author', klass: User)
+      end
+
+      def event_result
+        @event_result ||= @query.execute(self).to_a
+      end
+
+      def serialize(_event)
+        raise NotImplementedError.new("Expected #{self.name} to implement serialize(event)")
+      end
+
+      def has_permission?(id)
+        allowed_ids.nil? || allowed_ids.include?(id.to_i)
+      end
+
+      def allowed_ids
+        nil
+      end
+
+      def event_result_ids
+        event_result.map { |event| event['id'] }
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/code_event.rb b/lib/gitlab/cycle_analytics/code_event.rb
new file mode 100644
index 00000000000..2afdf0b8518
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/code_event.rb
@@ -0,0 +1,28 @@
+module Gitlab
+  module CycleAnalytics
+    class CodeEvent < BaseEvent
+      include MergeRequestAllowed
+
+      def initialize(*args)
+        @stage = :code
+        @start_time_attrs = issue_metrics_table[:first_mentioned_in_commit_at]
+        @end_time_attrs = mr_table[:created_at]
+        @projections = [mr_table[:title],
+                        mr_table[:iid],
+                        mr_table[:id],
+                        mr_table[:created_at],
+                        mr_table[:state],
+                        mr_table[:author_id]]
+        @order = mr_table[:created_at]
+
+        super(*args)
+      end
+
+      private
+
+      def serialize(event)
+        AnalyticsMergeRequestSerializer.new(project: @project).represent(event).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/events.rb b/lib/gitlab/cycle_analytics/events.rb
new file mode 100644
index 00000000000..2d703d76cbb
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/events.rb
@@ -0,0 +1,38 @@
+module Gitlab
+  module CycleAnalytics
+    class Events
+      def initialize(project:, options:)
+        @project = project
+        @options = options
+      end
+
+      def issue_events
+        IssueEvent.new(project: @project, options: @options).fetch
+      end
+
+      def plan_events
+        PlanEvent.new(project: @project, options: @options).fetch
+      end
+
+      def code_events
+        CodeEvent.new(project: @project, options: @options).fetch
+      end
+
+      def test_events
+        TestEvent.new(project: @project, options: @options).fetch
+      end
+
+      def review_events
+        ReviewEvent.new(project: @project, options: @options).fetch
+      end
+
+      def staging_events
+        StagingEvent.new(project: @project, options: @options).fetch
+      end
+
+      def production_events
+        ProductionEvent.new(project: @project, options: @options).fetch
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/events_query.rb b/lib/gitlab/cycle_analytics/events_query.rb
new file mode 100644
index 00000000000..2418832ccc2
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/events_query.rb
@@ -0,0 +1,37 @@
+module Gitlab
+  module CycleAnalytics
+    class EventsQuery
+      attr_reader :project
+
+      def initialize(project:, options: {})
+        @project = project
+        @from = options[:from]
+        @branch = options[:branch]
+        @fetcher = Gitlab::CycleAnalytics::MetricsFetcher.new(project: project, from: @from, branch: @branch)
+      end
+
+      def execute(stage_class)
+        @stage_class = stage_class
+
+        ActiveRecord::Base.connection.exec_query(query.to_sql)
+      end
+
+      private
+
+      def query
+        base_query = @fetcher.base_query_for(@stage_class.stage)
+        diff_fn = @fetcher.subtract_datetimes_diff(base_query, @stage_class.start_time_attrs, @stage_class.end_time_attrs)
+
+        @stage_class.custom_query(base_query)
+
+        base_query.project(extract_epoch(diff_fn).as('total_time'), *@stage_class.projections).order(@stage_class.order.desc)
+      end
+
+      def extract_epoch(arel_attribute)
+        return arel_attribute unless Gitlab::Database.postgresql?
+
+        Arel.sql(%Q{EXTRACT(EPOCH FROM (#{arel_attribute.to_sql}))})
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/issue_allowed.rb b/lib/gitlab/cycle_analytics/issue_allowed.rb
new file mode 100644
index 00000000000..a7652a70641
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/issue_allowed.rb
@@ -0,0 +1,9 @@
+module Gitlab
+  module CycleAnalytics
+    module IssueAllowed
+      def allowed_ids
+        @allowed_ids ||= IssuesFinder.new(@options[:current_user], project_id: @project.id).execute.where(id: event_result_ids).pluck(:id)
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/issue_event.rb b/lib/gitlab/cycle_analytics/issue_event.rb
new file mode 100644
index 00000000000..705b7e5ce24
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/issue_event.rb
@@ -0,0 +1,27 @@
+module Gitlab
+  module CycleAnalytics
+    class IssueEvent < BaseEvent
+      include IssueAllowed
+
+      def initialize(*args)
+        @stage = :issue
+        @start_time_attrs = issue_table[:created_at]
+        @end_time_attrs = [issue_metrics_table[:first_associated_with_milestone_at],
+                           issue_metrics_table[:first_added_to_board_at]]
+        @projections = [issue_table[:title],
+                        issue_table[:iid],
+                        issue_table[:id],
+                        issue_table[:created_at],
+                        issue_table[:author_id]]
+
+        super(*args)
+      end
+
+      private
+
+      def serialize(event)
+        AnalyticsIssueSerializer.new(project: @project).represent(event).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/merge_request_allowed.rb b/lib/gitlab/cycle_analytics/merge_request_allowed.rb
new file mode 100644
index 00000000000..28f6db44759
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/merge_request_allowed.rb
@@ -0,0 +1,9 @@
+module Gitlab
+  module CycleAnalytics
+    module MergeRequestAllowed
+      def allowed_ids
+        @allowed_ids ||= MergeRequestsFinder.new(@options[:current_user], project_id: @project.id).execute.where(id: event_result_ids).pluck(:id)
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/metrics_fetcher.rb b/lib/gitlab/cycle_analytics/metrics_fetcher.rb
new file mode 100644
index 00000000000..b71e8735e27
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/metrics_fetcher.rb
@@ -0,0 +1,60 @@
+module Gitlab
+  module CycleAnalytics
+    class MetricsFetcher
+      include Gitlab::Database::Median
+      include Gitlab::Database::DateTime
+      include MetricsTables
+
+      DEPLOYMENT_METRIC_STAGES = %i[production staging]
+
+      def initialize(project:, from:, branch:)
+        @project = project
+        @project = project
+        @from = from
+        @branch = branch
+      end
+
+      def calculate_metric(name, start_time_attrs, end_time_attrs)
+        cte_table = Arel::Table.new("cte_table_for_#{name}")
+
+        # Build a `SELECT` query. We find the first of the `end_time_attrs` that isn't `NULL` (call this end_time).
+        # Next, we find the first of the start_time_attrs that isn't `NULL` (call this start_time).
+        # We compute the (end_time - start_time) interval, and give it an alias based on the current
+        # cycle analytics stage.
+        interval_query = Arel::Nodes::As.new(
+          cte_table,
+          subtract_datetimes(base_query_for(name), start_time_attrs, end_time_attrs, name.to_s))
+
+        median_datetime(cte_table, interval_query, name)
+      end
+
+      # Join table with a row for every <issue,merge_request> pair (where the merge request
+      # closes the given issue) with issue and merge request metrics included. The metrics
+      # are loaded with an inner join, so issues / merge requests without metrics are
+      # automatically excluded.
+      def base_query_for(name)
+        # Load issues
+        query = mr_closing_issues_table.join(issue_table).on(issue_table[:id].eq(mr_closing_issues_table[:issue_id])).
+          join(issue_metrics_table).on(issue_table[:id].eq(issue_metrics_table[:issue_id])).
+          where(issue_table[:project_id].eq(@project.id)).
+          where(issue_table[:deleted_at].eq(nil)).
+          where(issue_table[:created_at].gteq(@from))
+
+        query = query.where(build_table[:ref].eq(@branch)) if name == :test && @branch
+
+        # Load merge_requests
+        query = query.join(mr_table, Arel::Nodes::OuterJoin).
+          on(mr_table[:id].eq(mr_closing_issues_table[:merge_request_id])).
+          join(mr_metrics_table).
+          on(mr_table[:id].eq(mr_metrics_table[:merge_request_id]))
+
+        if DEPLOYMENT_METRIC_STAGES.include?(name)
+          # Limit to merge requests that have been deployed to production after `@from`
+          query.where(mr_metrics_table[:first_deployed_to_production_at].gteq(@from))
+        end
+
+        query
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/metrics_tables.rb b/lib/gitlab/cycle_analytics/metrics_tables.rb
new file mode 100644
index 00000000000..9d25ef078e8
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/metrics_tables.rb
@@ -0,0 +1,37 @@
+module Gitlab
+  module CycleAnalytics
+    module MetricsTables
+      def mr_metrics_table
+        MergeRequest::Metrics.arel_table
+      end
+
+      def mr_table
+        MergeRequest.arel_table
+      end
+
+      def mr_diff_table
+        MergeRequestDiff.arel_table
+      end
+
+      def mr_closing_issues_table
+        MergeRequestsClosingIssues.arel_table
+      end
+
+      def issue_table
+        Issue.arel_table
+      end
+
+      def issue_metrics_table
+        Issue::Metrics.arel_table
+      end
+
+      def user_table
+        User.arel_table
+      end
+
+      def build_table
+        ::CommitStatus.arel_table
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/plan_event.rb b/lib/gitlab/cycle_analytics/plan_event.rb
new file mode 100644
index 00000000000..b1ae215f348
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/plan_event.rb
@@ -0,0 +1,44 @@
+module Gitlab
+  module CycleAnalytics
+    class PlanEvent < BaseEvent
+      def initialize(*args)
+        @stage = :plan
+        @start_time_attrs = issue_metrics_table[:first_associated_with_milestone_at]
+        @end_time_attrs = [issue_metrics_table[:first_added_to_board_at],
+                           issue_metrics_table[:first_mentioned_in_commit_at]]
+        @projections = [mr_diff_table[:st_commits].as('commits'),
+                        issue_metrics_table[:first_mentioned_in_commit_at]]
+
+        super(*args)
+      end
+
+      def custom_query(base_query)
+        base_query.join(mr_diff_table).on(mr_diff_table[:merge_request_id].eq(mr_table[:id]))
+      end
+
+      private
+
+      def serialize(event)
+        st_commit = first_time_reference_commit(event.delete('commits'), event)
+
+        return unless st_commit
+
+        serialize_commit(event, st_commit, query)
+      end
+
+      def first_time_reference_commit(commits, event)
+        YAML.load(commits).find do |commit|
+          next unless commit[:committed_date] && event['first_mentioned_in_commit_at']
+
+          commit[:committed_date].to_i == DateTime.parse(event['first_mentioned_in_commit_at'].to_s).to_i
+        end
+      end
+
+      def serialize_commit(event, st_commit, query)
+        commit = Commit.new(Gitlab::Git::Commit.new(st_commit), @project)
+
+        AnalyticsCommitSerializer.new(project: @project, total_time: event['total_time']).represent(commit).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/production_event.rb b/lib/gitlab/cycle_analytics/production_event.rb
new file mode 100644
index 00000000000..4868c3c6237
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/production_event.rb
@@ -0,0 +1,26 @@
+module Gitlab
+  module CycleAnalytics
+    class ProductionEvent < BaseEvent
+      include IssueAllowed
+
+      def initialize(*args)
+        @stage = :production
+        @start_time_attrs = issue_table[:created_at]
+        @end_time_attrs = mr_metrics_table[:first_deployed_to_production_at]
+        @projections = [issue_table[:title],
+                        issue_table[:iid],
+                        issue_table[:id],
+                        issue_table[:created_at],
+                        issue_table[:author_id]]
+
+        super(*args)
+      end
+
+      private
+
+      def serialize(event)
+        AnalyticsIssueSerializer.new(project: @project).represent(event).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/review_event.rb b/lib/gitlab/cycle_analytics/review_event.rb
new file mode 100644
index 00000000000..b394a02cc52
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/review_event.rb
@@ -0,0 +1,25 @@
+module Gitlab
+  module CycleAnalytics
+    class ReviewEvent < BaseEvent
+      include MergeRequestAllowed
+
+      def initialize(*args)
+        @stage = :review
+        @start_time_attrs = mr_table[:created_at]
+        @end_time_attrs = mr_metrics_table[:merged_at]
+        @projections = [mr_table[:title],
+                        mr_table[:iid],
+                        mr_table[:id],
+                        mr_table[:created_at],
+                        mr_table[:state],
+                        mr_table[:author_id]]
+
+        super(*args)
+      end
+
+      def serialize(event)
+        AnalyticsMergeRequestSerializer.new(project: @project).represent(event).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/staging_event.rb b/lib/gitlab/cycle_analytics/staging_event.rb
new file mode 100644
index 00000000000..a1f30b716f6
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/staging_event.rb
@@ -0,0 +1,31 @@
+module Gitlab
+  module CycleAnalytics
+    class StagingEvent < BaseEvent
+      def initialize(*args)
+        @stage = :staging
+        @start_time_attrs = mr_metrics_table[:merged_at]
+        @end_time_attrs = mr_metrics_table[:first_deployed_to_production_at]
+        @projections = [build_table[:id]]
+        @order = build_table[:created_at]
+
+        super(*args)
+      end
+
+      def fetch
+        Updater.update!(event_result, from: 'id', to: 'build', klass: ::Ci::Build)
+
+        super
+      end
+
+      def custom_query(base_query)
+        base_query.join(build_table).on(mr_metrics_table[:pipeline_id].eq(build_table[:commit_id]))
+      end
+
+      private
+
+      def serialize(event)
+        AnalyticsBuildSerializer.new.represent(event['build']).as_json
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/test_event.rb b/lib/gitlab/cycle_analytics/test_event.rb
new file mode 100644
index 00000000000..d553d0b5aec
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/test_event.rb
@@ -0,0 +1,13 @@
+module Gitlab
+  module CycleAnalytics
+    class TestEvent < StagingEvent
+      def initialize(*args)
+        super(*args)
+
+        @stage = :test
+        @start_time_attrs =  mr_metrics_table[:latest_build_started_at]
+        @end_time_attrs = mr_metrics_table[:latest_build_finished_at]
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/cycle_analytics/updater.rb b/lib/gitlab/cycle_analytics/updater.rb
new file mode 100644
index 00000000000..953268ebd46
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/updater.rb
@@ -0,0 +1,30 @@
+module Gitlab
+  module CycleAnalytics
+    class Updater
+      def self.update!(*args)
+        new(*args).update!
+      end
+
+      def initialize(event_result, from:, to:, klass:)
+        @event_result = event_result
+        @klass = klass
+        @from = from
+        @to = to
+      end
+
+      def update!
+        @event_result.each do |event|
+          event[@to] = items[event.delete(@from).to_i].first
+        end
+      end
+
+      def result_ids
+        @event_result.map { |event| event[@from] }
+      end
+
+      def items
+        @items ||= @klass.find(result_ids).group_by { |item| item['id'] }
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/database/date_time.rb b/lib/gitlab/database/date_time.rb
index b6a89f715fd..25e56998038 100644
--- a/lib/gitlab/database/date_time.rb
+++ b/lib/gitlab/database/date_time.rb
@@ -7,21 +7,25 @@ module Gitlab
       #
       # Note: For MySQL, the interval is returned in seconds.
       #       For PostgreSQL, the interval is returned as an INTERVAL type.
-      def subtract_datetimes(query_so_far, end_time_attrs, start_time_attrs, as)
-        diff_fn = if Gitlab::Database.postgresql?
-                    Arel::Nodes::Subtraction.new(
-                      Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs)),
-                      Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)))
-                  elsif Gitlab::Database.mysql?
-                    Arel::Nodes::NamedFunction.new(
-                      "TIMESTAMPDIFF",
-                      [Arel.sql('second'),
-                       Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)),
-                       Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs))])
-                  end
+      def subtract_datetimes(query_so_far, start_time_attrs, end_time_attrs, as)
+        diff_fn = subtract_datetimes_diff(query_so_far, start_time_attrs, end_time_attrs)
 
         query_so_far.project(diff_fn.as(as))
       end
+
+      def subtract_datetimes_diff(query_so_far, start_time_attrs, end_time_attrs)
+        if Gitlab::Database.postgresql?
+          Arel::Nodes::Subtraction.new(
+            Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs)),
+            Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)))
+        elsif Gitlab::Database.mysql?
+          Arel::Nodes::NamedFunction.new(
+            "TIMESTAMPDIFF",
+            [Arel.sql('second'),
+             Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)),
+             Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs))])
+        end
+      end
     end
   end
 end
diff --git a/spec/lib/gitlab/cycle_analytics/code_event_spec.rb b/spec/lib/gitlab/cycle_analytics/code_event_spec.rb
new file mode 100644
index 00000000000..43f42d1bde8
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/code_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::CodeEvent do
+  it_behaves_like 'default query config' do
+    it 'does not have the default order' do
+      expect(event.order).not_to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/events_spec.rb b/spec/lib/gitlab/cycle_analytics/events_spec.rb
new file mode 100644
index 00000000000..9aeaa6b3ee8
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/events_spec.rb
@@ -0,0 +1,326 @@
+require 'spec_helper'
+
+describe Gitlab::CycleAnalytics::Events do
+  let(:project) { create(:project) }
+  let(:from_date) { 10.days.ago }
+  let(:user) { create(:user, :admin) }
+  let!(:context) { create(:issue, project: project, created_at: 2.days.ago) }
+
+  subject { described_class.new(project: project, options: { from: from_date, current_user: user }) }
+
+  before do
+    allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([context])
+
+    setup(context)
+  end
+
+  describe '#issue_events' do
+    it 'has the total time' do
+      expect(subject.issue_events.first[:total_time]).not_to be_empty
+    end
+
+    it 'has a title' do
+      expect(subject.issue_events.first[:title]).to eq(context.title)
+    end
+
+    it 'has the URL' do
+      expect(subject.issue_events.first[:url]).not_to be_nil
+    end
+
+    it 'has an iid' do
+      expect(subject.issue_events.first[:iid]).to eq(context.iid.to_s)
+    end
+
+    it 'has a created_at timestamp' do
+      expect(subject.issue_events.first[:created_at]).to end_with('ago')
+    end
+
+    it "has the author's URL" do
+      expect(subject.issue_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.issue_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.issue_events.first[:author][:name]).to eq(context.author.name)
+    end
+  end
+
+  describe '#plan_events' do
+    it 'has a title' do
+      expect(subject.plan_events.first[:title]).not_to be_nil
+    end
+
+    it 'has a sha short ID' do
+      expect(subject.plan_events.first[:short_sha]).not_to be_nil
+    end
+
+    it 'has the URL' do
+      expect(subject.plan_events.first[:commit_url]).not_to be_nil
+    end
+
+    it 'has the total time' do
+      expect(subject.plan_events.first[:total_time]).not_to be_empty
+    end
+
+    it "has the author's URL" do
+      expect(subject.plan_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.plan_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.plan_events.first[:author][:name]).not_to be_nil
+    end
+  end
+
+  describe '#code_events' do
+    before do
+      create_commit_referencing_issue(context)
+    end
+
+    it 'has the total time' do
+      expect(subject.code_events.first[:total_time]).not_to be_empty
+    end
+
+    it 'has a title' do
+      expect(subject.code_events.first[:title]).to eq('Awesome merge_request')
+    end
+
+    it 'has an iid' do
+      expect(subject.code_events.first[:iid]).to eq(context.iid.to_s)
+    end
+
+    it 'has a created_at timestamp' do
+      expect(subject.code_events.first[:created_at]).to end_with('ago')
+    end
+
+    it "has the author's URL" do
+      expect(subject.code_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.code_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.code_events.first[:author][:name]).to eq(MergeRequest.first.author.name)
+    end
+  end
+
+  describe '#test_events' do
+    let(:merge_request) { MergeRequest.first }
+    let!(:pipeline) do
+      create(:ci_pipeline,
+             ref: merge_request.source_branch,
+             sha: merge_request.diff_head_sha,
+             project: context.project)
+    end
+
+    before do
+      create(:ci_build, pipeline: pipeline, status: :success, author: user)
+      create(:ci_build, pipeline: pipeline, status: :success, author: user)
+
+      pipeline.run!
+      pipeline.succeed!
+    end
+
+    it 'has the name' do
+      expect(subject.test_events.first[:name]).not_to be_nil
+    end
+
+    it 'has the ID' do
+      expect(subject.test_events.first[:id]).not_to be_nil
+    end
+
+    it 'has the URL' do
+      expect(subject.test_events.first[:url]).not_to be_nil
+    end
+
+    it 'has the branch name' do
+      expect(subject.test_events.first[:branch]).not_to be_nil
+    end
+
+    it 'has the branch URL' do
+      expect(subject.test_events.first[:branch][:url]).not_to be_nil
+    end
+
+    it 'has the short SHA' do
+      expect(subject.test_events.first[:short_sha]).not_to be_nil
+    end
+
+    it 'has the commit URL' do
+      expect(subject.test_events.first[:commit_url]).not_to be_nil
+    end
+
+    it 'has the date' do
+      expect(subject.test_events.first[:date]).not_to be_nil
+    end
+
+    it 'has the total time' do
+      expect(subject.test_events.first[:total_time]).not_to be_empty
+    end
+  end
+
+  describe '#review_events' do
+    let!(:context) { create(:issue, project: project, created_at: 2.days.ago) }
+
+    it 'has the total time' do
+      expect(subject.review_events.first[:total_time]).not_to be_empty
+    end
+
+    it 'has a title' do
+      expect(subject.review_events.first[:title]).to eq('Awesome merge_request')
+    end
+
+    it 'has an iid' do
+      expect(subject.review_events.first[:iid]).to eq(context.iid.to_s)
+    end
+
+    it 'has the URL' do
+      expect(subject.review_events.first[:url]).not_to be_nil
+    end
+
+    it 'has a state' do
+      expect(subject.review_events.first[:state]).not_to be_nil
+    end
+
+    it 'has a created_at timestamp' do
+      expect(subject.review_events.first[:created_at]).not_to be_nil
+    end
+
+    it "has the author's URL" do
+      expect(subject.review_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.review_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.review_events.first[:author][:name]).to eq(MergeRequest.first.author.name)
+    end
+  end
+
+  describe '#staging_events' do
+    let(:merge_request) { MergeRequest.first }
+    let!(:pipeline) do
+      create(:ci_pipeline,
+             ref: merge_request.source_branch,
+             sha: merge_request.diff_head_sha,
+             project: context.project)
+    end
+
+    before do
+      create(:ci_build, pipeline: pipeline, status: :success, author: user)
+      create(:ci_build, pipeline: pipeline, status: :success, author: user)
+
+      pipeline.run!
+      pipeline.succeed!
+
+      merge_merge_requests_closing_issue(context)
+      deploy_master
+    end
+
+    it 'has the name' do
+      expect(subject.staging_events.first[:name]).not_to be_nil
+    end
+
+    it 'has the ID' do
+      expect(subject.staging_events.first[:id]).not_to be_nil
+    end
+
+    it 'has the URL' do
+      expect(subject.staging_events.first[:url]).not_to be_nil
+    end
+
+    it 'has the branch name' do
+      expect(subject.staging_events.first[:branch]).not_to be_nil
+    end
+
+    it 'has the branch URL' do
+      expect(subject.staging_events.first[:branch][:url]).not_to be_nil
+    end
+
+    it 'has the short SHA' do
+      expect(subject.staging_events.first[:short_sha]).not_to be_nil
+    end
+
+    it 'has the commit URL' do
+      expect(subject.staging_events.first[:commit_url]).not_to be_nil
+    end
+
+    it 'has the date' do
+      expect(subject.staging_events.first[:date]).not_to be_nil
+    end
+
+    it 'has the total time' do
+      expect(subject.staging_events.first[:total_time]).not_to be_empty
+    end
+
+    it "has the author's URL" do
+      expect(subject.staging_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.staging_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.staging_events.first[:author][:name]).to eq(MergeRequest.first.author.name)
+    end
+  end
+
+  describe '#production_events' do
+    let!(:context) { create(:issue, project: project, created_at: 2.days.ago) }
+
+    before do
+      merge_merge_requests_closing_issue(context)
+      deploy_master
+    end
+
+    it 'has the total time' do
+      expect(subject.production_events.first[:total_time]).not_to be_empty
+    end
+
+    it 'has a title' do
+      expect(subject.production_events.first[:title]).to eq(context.title)
+    end
+
+    it 'has the URL' do
+      expect(subject.production_events.first[:url]).not_to be_nil
+    end
+
+    it 'has an iid' do
+      expect(subject.production_events.first[:iid]).to eq(context.iid.to_s)
+    end
+
+    it 'has a created_at timestamp' do
+      expect(subject.production_events.first[:created_at]).to end_with('ago')
+    end
+
+    it "has the author's URL" do
+      expect(subject.production_events.first[:author][:web_url]).not_to be_nil
+    end
+
+    it "has the author's avatar URL" do
+      expect(subject.production_events.first[:author][:avatar_url]).not_to be_nil
+    end
+
+    it "has the author's name" do
+      expect(subject.production_events.first[:author][:name]).to eq(context.author.name)
+    end
+  end
+
+  def setup(context)
+    milestone = create(:milestone, project: project)
+    context.update(milestone: milestone)
+    mr = create_merge_request_closing_issue(context)
+
+    ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.sha)
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/issue_event_spec.rb b/spec/lib/gitlab/cycle_analytics/issue_event_spec.rb
new file mode 100644
index 00000000000..1c5c308da7d
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/issue_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::IssueEvent do
+  it_behaves_like 'default query config' do
+    it 'has the default order' do
+      expect(event.order).to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/plan_event_spec.rb b/spec/lib/gitlab/cycle_analytics/plan_event_spec.rb
new file mode 100644
index 00000000000..d76a255acf5
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/plan_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::PlanEvent do
+  it_behaves_like 'default query config' do
+    it 'has the default order' do
+      expect(event.order).to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/production_event_spec.rb b/spec/lib/gitlab/cycle_analytics/production_event_spec.rb
new file mode 100644
index 00000000000..ac17e3b4287
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/production_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::ProductionEvent do
+  it_behaves_like 'default query config' do
+    it 'has the default order' do
+      expect(event.order).to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/review_event_spec.rb b/spec/lib/gitlab/cycle_analytics/review_event_spec.rb
new file mode 100644
index 00000000000..1ff53aa0227
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/review_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::ReviewEvent do
+  it_behaves_like 'default query config' do
+    it 'has the default order' do
+      expect(event.order).to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/shared_event_spec.rb b/spec/lib/gitlab/cycle_analytics/shared_event_spec.rb
new file mode 100644
index 00000000000..7019e4c3351
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/shared_event_spec.rb
@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+shared_examples 'default query config' do
+  let(:event) { described_class.new(project: double, options: {}) }
+
+  it 'has the start attributes' do
+    expect(event.start_time_attrs).not_to be_nil
+  end
+
+  it 'has the stage attribute' do
+    expect(event.stage).not_to be_nil
+  end
+
+  it 'has the end attributes' do
+    expect(event.end_time_attrs).not_to be_nil
+  end
+
+  it 'has the projection attributes' do
+    expect(event.projections).not_to be_nil
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/staging_event_spec.rb b/spec/lib/gitlab/cycle_analytics/staging_event_spec.rb
new file mode 100644
index 00000000000..4862d4765f2
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/staging_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::StagingEvent do
+  it_behaves_like 'default query config' do
+    it 'does not have the default order' do
+      expect(event.order).not_to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/test_event_spec.rb b/spec/lib/gitlab/cycle_analytics/test_event_spec.rb
new file mode 100644
index 00000000000..e249db69fc6
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/test_event_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'lib/gitlab/cycle_analytics/shared_event_spec'
+
+describe Gitlab::CycleAnalytics::TestEvent do
+  it_behaves_like 'default query config' do
+    it 'does not have the default order' do
+      expect(event.order).not_to eq(event.start_time_attrs)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cycle_analytics/updater_spec.rb b/spec/lib/gitlab/cycle_analytics/updater_spec.rb
new file mode 100644
index 00000000000..eff54cd3692
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/updater_spec.rb
@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe Gitlab::CycleAnalytics::Updater do
+  describe 'updates authors' do
+    let(:user) { create(:user) }
+    let(:events) { [{ 'author_id' => user.id }] }
+
+    it 'maps the correct user' do
+      described_class.update!(events, from: 'author_id', to: 'author', klass: User)
+
+      expect(events.first['author']).to eq(user)
+    end
+  end
+
+  describe 'updates builds' do
+    let(:build) { create(:ci_build) }
+    let(:events) { [{ 'id' => build.id }] }
+
+    it 'maps the correct build' do
+      described_class.update!(events, from: 'id', to: 'build', klass: ::Ci::Build)
+
+      expect(events.first['build']).to eq(build)
+    end
+  end
+end
diff --git a/spec/lib/light_url_builder_spec.rb b/spec/lib/light_url_builder_spec.rb
new file mode 100644
index 00000000000..a826b24419a
--- /dev/null
+++ b/spec/lib/light_url_builder_spec.rb
@@ -0,0 +1,119 @@
+require 'spec_helper'
+
+describe Gitlab::UrlBuilder, lib: true do
+  describe '.build' do
+    context 'when passing a Commit' do
+      it 'returns a proper URL' do
+        commit = build_stubbed(:commit)
+
+        url = described_class.build(commit)
+
+        expect(url).to eq "#{Settings.gitlab['url']}/#{commit.project.path_with_namespace}/commit/#{commit.id}"
+      end
+    end
+
+    context 'when passing an Issue' do
+      it 'returns a proper URL' do
+        issue = build_stubbed(:issue, iid: 42)
+
+        url = described_class.build(issue)
+
+        expect(url).to eq "#{Settings.gitlab['url']}/#{issue.project.path_with_namespace}/issues/#{issue.iid}"
+      end
+    end
+
+    context 'when passing a MergeRequest' do
+      it 'returns a proper URL' do
+        merge_request = build_stubbed(:merge_request, iid: 42)
+
+        url = described_class.build(merge_request)
+
+        expect(url).to eq "#{Settings.gitlab['url']}/#{merge_request.project.path_with_namespace}/merge_requests/#{merge_request.iid}"
+      end
+    end
+
+    context 'when passing a Note' do
+      context 'on a Commit' do
+        it 'returns a proper URL' do
+          note = build_stubbed(:note_on_commit)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{note.project.path_with_namespace}/commit/#{note.commit_id}#note_#{note.id}"
+        end
+      end
+
+      context 'on a Commit Diff' do
+        it 'returns a proper URL' do
+          note = build_stubbed(:diff_note_on_commit)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{note.project.path_with_namespace}/commit/#{note.commit_id}#note_#{note.id}"
+        end
+      end
+
+      context 'on an Issue' do
+        it 'returns a proper URL' do
+          issue = create(:issue, iid: 42)
+          note = build_stubbed(:note_on_issue, noteable: issue)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{issue.project.path_with_namespace}/issues/#{issue.iid}#note_#{note.id}"
+        end
+      end
+
+      context 'on a MergeRequest' do
+        it 'returns a proper URL' do
+          merge_request = create(:merge_request, iid: 42)
+          note = build_stubbed(:note_on_merge_request, noteable: merge_request)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{merge_request.project.path_with_namespace}/merge_requests/#{merge_request.iid}#note_#{note.id}"
+        end
+      end
+
+      context 'on a MergeRequest Diff' do
+        it 'returns a proper URL' do
+          merge_request = create(:merge_request, iid: 42)
+          note = build_stubbed(:diff_note_on_merge_request, noteable: merge_request)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{merge_request.project.path_with_namespace}/merge_requests/#{merge_request.iid}#note_#{note.id}"
+        end
+      end
+
+      context 'on a ProjectSnippet' do
+        it 'returns a proper URL' do
+          project_snippet = create(:project_snippet)
+          note = build_stubbed(:note_on_project_snippet, noteable: project_snippet)
+
+          url = described_class.build(note)
+
+          expect(url).to eq "#{Settings.gitlab['url']}/#{project_snippet.project.path_with_namespace}/snippets/#{note.noteable_id}#note_#{note.id}"
+        end
+      end
+
+      context 'on another object' do
+        it 'returns a proper URL' do
+          project = build_stubbed(:project)
+
+          expect { described_class.build(project) }.
+            to raise_error(NotImplementedError, 'No URL builder defined for Project')
+        end
+      end
+    end
+
+    context 'when passing a WikiPage' do
+      it 'returns a proper URL' do
+        wiki_page = build(:wiki_page)
+        url = described_class.build(wiki_page)
+
+        expect(url).to eq "#{Gitlab.config.gitlab.url}#{wiki_page.wiki.wiki_base_path}/#{wiki_page.slug}"
+      end
+    end
+  end
+end
diff --git a/spec/requests/projects/cycle_analytics_events_spec.rb b/spec/requests/projects/cycle_analytics_events_spec.rb
new file mode 100644
index 00000000000..705dbb7d1c0
--- /dev/null
+++ b/spec/requests/projects/cycle_analytics_events_spec.rb
@@ -0,0 +1,140 @@
+require 'spec_helper'
+
+describe 'cycle analytics events' do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let(:issue) {  create(:issue, project: project, created_at: 2.days.ago) }
+
+  describe 'GET /:namespace/:project/cycle_analytics/events/issues' do
+    before do
+      project.team << [user, :developer]
+
+      allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([issue])
+
+      3.times { create_cycle }
+      deploy_master
+
+      login_as(user)
+    end
+
+    it 'lists the issue events' do
+      get namespace_project_cycle_analytics_issue_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      first_issue_iid = Issue.order(created_at: :desc).pluck(:iid).first.to_s
+
+      expect(json_response['events'].first['iid']).to eq(first_issue_iid)
+    end
+
+    it 'lists the plan events' do
+      get namespace_project_cycle_analytics_plan_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      expect(json_response['events'].first['short_sha']).to eq(MergeRequest.last.commits.first.short_id)
+    end
+
+    it 'lists the code events' do
+      get namespace_project_cycle_analytics_code_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      first_mr_iid = MergeRequest.order(created_at: :desc).pluck(:iid).first.to_s
+
+      expect(json_response['events'].first['iid']).to eq(first_mr_iid)
+    end
+
+    it 'lists the test events' do
+      get namespace_project_cycle_analytics_test_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      expect(json_response['events'].first['date']).not_to be_empty
+    end
+
+    it 'lists the review events' do
+      get namespace_project_cycle_analytics_review_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      first_mr_iid = MergeRequest.order(created_at: :desc).pluck(:iid).first.to_s
+
+      expect(json_response['events'].first['iid']).to eq(first_mr_iid)
+    end
+
+    it 'lists the staging events' do
+      get namespace_project_cycle_analytics_staging_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      expect(json_response['events'].first['date']).not_to be_empty
+    end
+
+    it 'lists the production events' do
+      get namespace_project_cycle_analytics_production_path(project.namespace, project, format: :json)
+
+      expect(json_response['events']).not_to be_empty
+
+      first_issue_iid = Issue.order(created_at: :desc).pluck(:iid).first.to_s
+
+      expect(json_response['events'].first['iid']).to eq(first_issue_iid)
+    end
+
+    context 'specific branch' do
+      it 'lists the test events' do
+        branch = MergeRequest.first.source_branch
+
+        get namespace_project_cycle_analytics_test_path(project.namespace, project, format: :json, branch: branch)
+
+        expect(json_response['events']).not_to be_empty
+
+        expect(json_response['events'].first['date']).not_to be_empty
+      end
+    end
+
+    context 'with private project and builds' do
+      before do
+        ProjectMember.first.update(access_level: Gitlab::Access::GUEST)
+      end
+
+      it 'does not list the test events' do
+        get namespace_project_cycle_analytics_test_path(project.namespace, project, format: :json)
+
+        expect(response).to have_http_status(:not_found)
+      end
+
+      it 'does not list the staging events' do
+        get namespace_project_cycle_analytics_staging_path(project.namespace, project, format: :json)
+
+        expect(response).to have_http_status(:not_found)
+      end
+
+      it 'lists the issue events' do
+        get namespace_project_cycle_analytics_issue_path(project.namespace, project, format: :json)
+
+        expect(response).to have_http_status(:ok)
+      end
+    end
+  end
+
+  def json_response
+    JSON.parse(response.body)
+  end
+
+  def create_cycle
+    milestone = create(:milestone, project: project)
+    issue.update(milestone: milestone)
+    mr = create_merge_request_closing_issue(issue)
+
+    pipeline = create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha)
+    pipeline.run
+
+    create(:ci_build, pipeline: pipeline, status: :success, author: user)
+    create(:ci_build, pipeline: pipeline, status: :success, author: user)
+
+    merge_merge_requests_closing_issue(issue)
+
+    ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.sha)
+  end
+end
diff --git a/spec/serializers/analytics_build_entity_spec.rb b/spec/serializers/analytics_build_entity_spec.rb
new file mode 100644
index 00000000000..9ac6f20fd3c
--- /dev/null
+++ b/spec/serializers/analytics_build_entity_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe AnalyticsBuildEntity do
+  let(:entity) do
+    described_class.new(build, request: double)
+  end
+
+  context 'build with an author' do
+    let(:user) { create(:user) }
+    let(:build) { create(:ci_build, author: user) }
+
+    subject { entity.as_json }
+
+    it 'contains the URL' do
+      expect(subject).to include(:url)
+    end
+
+    it 'contains the author' do
+      expect(subject).to include(:author)
+    end
+
+    it 'does not contain sensitive information' do
+      expect(subject).not_to include(/token/)
+      expect(subject).not_to include(/variables/)
+    end
+  end
+end
diff --git a/spec/serializers/analytics_build_serializer_spec.rb b/spec/serializers/analytics_build_serializer_spec.rb
new file mode 100644
index 00000000000..a0a9d9a5f12
--- /dev/null
+++ b/spec/serializers/analytics_build_serializer_spec.rb
@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+describe AnalyticsBuildSerializer do
+  let(:serializer) do
+    described_class
+      .new.represent(resource)
+  end
+
+  let(:json) { serializer.as_json }
+  let(:resource) { create(:ci_build) }
+
+  context 'when there is a single object provided' do
+    it 'it generates payload for single object' do
+      expect(json).to be_an_instance_of Hash
+    end
+
+    it 'contains important elements of analyticsBuild' do
+      expect(json)
+        .to include(:name, :branch, :short_sha, :date, :total_time, :url, :author)
+    end
+  end
+end
diff --git a/spec/serializers/analytics_generic_entity_spec.rb b/spec/serializers/analytics_generic_entity_spec.rb
new file mode 100644
index 00000000000..68086216ba9
--- /dev/null
+++ b/spec/serializers/analytics_generic_entity_spec.rb
@@ -0,0 +1,39 @@
+require 'spec_helper'
+
+describe AnalyticsIssueEntity do
+  let(:user) { create(:user) }
+  let(:entity_hash) do
+    {
+      total_time: "172802.724419",
+      title: "Eos voluptatem inventore in sed.",
+      iid: "1",
+      id: "1",
+      created_at: "2016-11-12 15:04:02.948604",
+      author: user,
+    }
+  end
+
+  let(:project) { create(:empty_project) }
+  let(:request) { EntityRequest.new(project: project, entity: :merge_request) }
+
+  let(:entity) do
+    described_class.new(entity_hash, request: request, project: project)
+  end
+
+  context 'generic entity' do
+    subject { entity.as_json }
+
+    it 'contains the entity URL' do
+      expect(subject).to include(:url)
+    end
+
+    it 'contains the author' do
+      expect(subject).to include(:author)
+    end
+
+    it 'does not contain sensitive information' do
+      expect(subject).not_to include(/token/)
+      expect(subject).not_to include(/variables/)
+    end
+  end
+end
diff --git a/spec/serializers/analytics_issue_serializer_spec.rb b/spec/serializers/analytics_issue_serializer_spec.rb
new file mode 100644
index 00000000000..2842e1ba52f
--- /dev/null
+++ b/spec/serializers/analytics_issue_serializer_spec.rb
@@ -0,0 +1,33 @@
+require 'spec_helper'
+
+describe AnalyticsIssueSerializer do
+  let(:serializer) do
+    described_class
+      .new(project: project, entity: :merge_request)
+      .represent(resource)
+  end
+
+  let(:user) { create(:user) }
+  let(:json) { serializer.as_json }
+  let(:project) { create(:project) }
+  let(:resource) do
+    {
+      total_time: "172802.724419",
+      title: "Eos voluptatem inventore in sed.",
+      iid: "1",
+      id: "1",
+      created_at: "2016-11-12 15:04:02.948604",
+      author: user,
+    }
+  end
+
+  context 'when there is a single object provided' do
+    it 'it generates payload for single object' do
+      expect(json).to be_an_instance_of Hash
+    end
+
+    it 'contains important elements of the issue' do
+      expect(json).to include(:title, :iid, :created_at, :total_time, :url, :author)
+    end
+  end
+end
diff --git a/spec/serializers/analytics_merge_request_serializer_spec.rb b/spec/serializers/analytics_merge_request_serializer_spec.rb
new file mode 100644
index 00000000000..564207984df
--- /dev/null
+++ b/spec/serializers/analytics_merge_request_serializer_spec.rb
@@ -0,0 +1,34 @@
+require 'spec_helper'
+
+describe AnalyticsMergeRequestSerializer do
+  let(:serializer) do
+    described_class
+      .new(project: project, entity: :merge_request)
+      .represent(resource)
+  end
+
+  let(:user) { create(:user) }
+  let(:json) { serializer.as_json }
+  let(:project) { create(:project) }
+  let(:resource) do
+    {
+      total_time: "172802.724419",
+      title: "Eos voluptatem inventore in sed.",
+      iid: "1",
+      id: "1",
+      state: 'open',
+      created_at: "2016-11-12 15:04:02.948604",
+      author: user
+    }
+  end
+
+  context 'when there is a single object provided' do
+    it 'it generates payload for single object' do
+      expect(json).to be_an_instance_of Hash
+    end
+
+    it 'contains important elements of the merge request' do
+      expect(json).to include(:title, :iid, :created_at, :total_time, :url, :author, :state)
+    end
+  end
+end
diff --git a/spec/serializers/entity_date_helper_spec.rb b/spec/serializers/entity_date_helper_spec.rb
new file mode 100644
index 00000000000..b9cc2f64831
--- /dev/null
+++ b/spec/serializers/entity_date_helper_spec.rb
@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+describe EntityDateHelper do
+  let(:date_helper_class) { Class.new { include EntityDateHelper }.new }
+
+  it 'converts 0 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(0)).to eq(seconds: 0)
+  end
+
+  it 'converts 40 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(40)).to eq(seconds: 40)
+  end
+
+  it 'converts 60 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(60)).to eq(mins: 1)
+  end
+
+  it 'converts 70 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(70)).to eq(mins: 1, seconds: 10)
+  end
+
+  it 'converts 3600 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(3600)).to eq(hours: 1)
+  end
+
+  it 'converts 3750 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(3750)).to eq(hours: 1, mins: 2, seconds: 30)
+  end
+
+  it 'converts 86400 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(86400)).to eq(days: 1)
+  end
+
+  it 'converts 86560 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(86560)).to eq(days: 1, mins: 2, seconds: 40)
+  end
+
+  it 'converts 86760 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(99760)).to eq(days: 1, hours: 3, mins: 42, seconds: 40)
+  end
+
+  it 'converts 986760 seconds' do
+    expect(date_helper_class.distance_of_time_as_hash(986760)).to eq(days: 11, hours: 10, mins: 6)
+  end
+end
diff --git a/spec/workers/pipeline_metrics_worker_spec.rb b/spec/workers/pipeline_metrics_worker_spec.rb
index 2c9e7c2cd02..2d47d93acec 100644
--- a/spec/workers/pipeline_metrics_worker_spec.rb
+++ b/spec/workers/pipeline_metrics_worker_spec.rb
@@ -15,32 +15,36 @@ describe PipelineMetricsWorker do
   end
 
   describe '#perform' do
-    subject { described_class.new.perform(pipeline.id) }
+    before do
+      described_class.new.perform(pipeline.id)
+    end
 
     context 'when pipeline is running' do
       let(:status) { 'running' }
 
       it 'records the build start time' do
-        subject
-
         expect(merge_request.reload.metrics.latest_build_started_at).to be_like_time(pipeline.started_at)
       end
 
       it 'clears the build end time' do
-        subject
-
         expect(merge_request.reload.metrics.latest_build_finished_at).to be_nil
       end
+
+      it 'records the pipeline' do
+        expect(merge_request.reload.metrics.pipeline).to eq(pipeline)
+      end
     end
 
     context 'when pipeline succeeded' do
       let(:status) { 'success' }
 
       it 'records the build end time' do
-        subject
-
         expect(merge_request.reload.metrics.latest_build_finished_at).to be_like_time(pipeline.finished_at)
       end
+
+      it 'records the pipeline' do
+        expect(merge_request.reload.metrics.pipeline).to eq(pipeline)
+      end
     end
   end
 end