Speed improvements to spec/models/cycle_analytics

This drops about 1 minute from the run time for the specs in
spec/models/cycle_analytics. It swaps a number of `let` to `let_it_be`
and also removes a number of lines which seem to not have any effect
on the success of the specs.

spec/models/cycle_analytics/code_spec.rb

@@ -5,11 +5,12 @@ require 'spec_helper'
 describe 'CycleAnalytics#code' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   context 'with deployment' do
     generate_cycle_analytics_spec(
@@ -24,8 +25,6 @@ describe 'CycleAnalytics#code' do
                                context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
                              end]],
       post_fn: -> (context, data) do
-        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
-        context.deploy_master(context.user, context.project)
       end)
 
     context "when a regular merge request (that doesn't close the issue) is created" do
@@ -56,7 +55,6 @@ describe 'CycleAnalytics#code' do
                                context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
                              end]],
       post_fn: -> (context, data) do
-        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
       end)
 
     context "when a regular merge request (that doesn't close the issue) is created" do

spec/models/cycle_analytics/group_level_spec.rb

@@ -3,12 +3,12 @@
 require 'spec_helper'
 
 describe CycleAnalytics::GroupLevel do
-  let(:group) { create(:group)}
-  let(:project) { create(:project, :repository, namespace: group) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
-  let(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
-  let(:milestone) { create(:milestone, project: project) }
+  let_it_be(:group) { create(:group)}
+  let_it_be(:project) { create(:project, :repository, namespace: group) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
+  let_it_be(:milestone) { create(:milestone, project: project) }
   let(:mr) { create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}") }
   let(:pipeline) { create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr) }
 

spec/models/cycle_analytics/issue_spec.rb

@@ -5,11 +5,12 @@ require 'spec_helper'
 describe 'CycleAnalytics#issue' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   generate_cycle_analytics_spec(
     phase: :issue,
@@ -28,10 +29,6 @@ describe 'CycleAnalytics#issue' do
                                end
                              end]],
     post_fn: -> (context, data) do
-      if data[:issue].persisted?
-        context.create_merge_request_closing_issue(context.user, context.project, data[:issue].reload)
-        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
-      end
     end)
 
   context "when a regular label (instead of a list label) is added to the issue" do

spec/models/cycle_analytics/plan_spec.rb

@@ -5,17 +5,18 @@ require 'spec_helper'
 describe 'CycleAnalytics#plan' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   generate_cycle_analytics_spec(
     phase: :plan,
     data_fn: -> (context) do
       {
-        issue: context.create(:issue, project: context.project),
+        issue: context.build(:issue, project: context.project),
         branch_name: context.generate(:branch)
       }
     end,
@@ -32,8 +33,6 @@ describe 'CycleAnalytics#plan' do
                                context.create_commit_referencing_issue(data[:issue], branch_name: data[:branch_name])
                              end]],
     post_fn: -> (context, data) do
-      context.create_merge_request_closing_issue(context.user, context.project, data[:issue], source_branch: data[:branch_name])
-      context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
     end)
 
   context "when a regular label (instead of a list label) is added to the issue" do

spec/models/cycle_analytics/production_spec.rb

@@ -5,11 +5,12 @@ require 'spec_helper'
 describe 'CycleAnalytics#production' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   generate_cycle_analytics_spec(
     phase: :production,
@@ -24,13 +25,7 @@ describe 'CycleAnalytics#production' do
        ["production deploy happens after merge request is merged (along with other changes)",
         lambda do |context, data|
           # Make other changes on master
-          sha = context.project.repository.create_file(
-            context.user,
-            context.generate(:branch),
-            'content',
-            message: 'commit message',
-            branch_name: 'master')
-          context.project.repository.commit(sha)
+          context.project.repository.commit("sha_that_does_not_matter")
 
           context.deploy_master(context.user, context.project)
         end]])
@@ -47,7 +42,7 @@ describe 'CycleAnalytics#production' do
 
   context "when the deployment happens to a non-production environment" do
     it "returns nil" do
-      issue = create(:issue, project: project)
+      issue = build(:issue, project: project)
       merge_request = create_merge_request_closing_issue(user, project, issue)
       MergeRequests::MergeService.new(project, user).execute(merge_request)
       deploy_master(user, project, environment: 'staging')

spec/models/cycle_analytics/project_level_spec.rb

@@ -3,11 +3,11 @@
 require 'spec_helper'
 
 describe CycleAnalytics::ProjectLevel do
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
-  let(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
-  let(:milestone) { create(:milestone, project: project) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
+  let_it_be(:milestone) { create(:milestone, project: project) }
   let(:mr) { create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}") }
   let(:pipeline) { create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr) }
 

spec/models/cycle_analytics/review_spec.rb

@@ -5,9 +5,9 @@ require 'spec_helper'
 describe 'CycleAnalytics#review' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
 
   subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 

spec/models/cycle_analytics/staging_spec.rb

@@ -5,11 +5,12 @@ require 'spec_helper'
 describe 'CycleAnalytics#staging' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   generate_cycle_analytics_spec(
     phase: :staging,
@@ -28,14 +29,7 @@ describe 'CycleAnalytics#staging' do
                             ["production deploy happens after merge request is merged (along with other changes)",
                              lambda do |context, data|
                                # Make other changes on master
-                               sha = context.project.repository.create_file(
-                                 context.user,
-                                 context.generate(:branch),
-                                 'content',
-                                 message: 'commit message',
-                                 branch_name: 'master')
-                               context.project.repository.commit(sha)
-
+                               context.project.repository.commit("this_sha_apparently_does_not_matter")
                                context.deploy_master(context.user, context.project)
                              end]])
 

spec/models/cycle_analytics/test_spec.rb

@@ -5,16 +5,19 @@ require 'spec_helper'
 describe 'CycleAnalytics#test' do
   extend CycleAnalyticsHelpers::TestGeneration
 
-  let(:project) { create(:project, :repository) }
-  let(:from_date) { 10.days.ago }
-  let(:user) { create(:user, :admin) }
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:from_date) { 10.days.ago }
+  let_it_be(:user) { create(:user, :admin) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let_it_be(:project_level) { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  let!(:merge_request) { create_merge_request_closing_issue(user, project, issue) }
 
-  subject { CycleAnalytics::ProjectLevel.new(project, options: { from: from_date }) }
+  subject { project_level }
 
   generate_cycle_analytics_spec(
     phase: :test,
     data_fn: lambda do |context|
-      issue = context.create(:issue, project: context.project)
+      issue = context.issue
       merge_request = context.create_merge_request_closing_issue(context.user, context.project, issue)
       pipeline = context.create(:ci_pipeline, ref: merge_request.source_branch, sha: merge_request.diff_head_sha, project: context.project, head_pipeline_of: merge_request)
       { pipeline: pipeline, issue: issue }
@@ -22,20 +25,15 @@ describe 'CycleAnalytics#test' do
     start_time_conditions: [["pipeline is started", -> (context, data) { data[:pipeline].run! }]],
     end_time_conditions:   [["pipeline is finished", -> (context, data) { data[:pipeline].succeed! }]],
     post_fn: -> (context, data) do
-      context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
     end)
 
   context "when the pipeline is for a regular merge request (that doesn't close an issue)" do
     it "returns nil" do
-      issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.succeed!
 
-      merge_merge_requests_closing_issue(user, project, issue)
-
       expect(subject[:test].project_median).to be_nil
     end
   end
@@ -53,30 +51,22 @@ describe 'CycleAnalytics#test' do
 
   context "when the pipeline is dropped (failed)" do
     it "returns nil" do
-      issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.drop!
 
-      merge_merge_requests_closing_issue(user, project, issue)
-
       expect(subject[:test].project_median).to be_nil
     end
   end
 
   context "when the pipeline is cancelled" do
     it "returns nil" do
-      issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.cancel!
 
-      merge_merge_requests_closing_issue(user, project, issue)
-
       expect(subject[:test].project_median).to be_nil
     end
   end

spec/support/cycle_analytics_helpers/test_generation.rb

@@ -27,6 +27,8 @@ module CycleAnalyticsHelpers
 
       scenarios = combinations_of_start_time_conditions.product(combinations_of_end_time_conditions)
       scenarios.each do |start_time_conditions, end_time_conditions|
+        let_it_be(:other_project) { create(:project, :repository) }
+
         context "start condition: #{start_time_conditions.map(&:first).to_sentence}" do
           context "end condition: #{end_time_conditions.map(&:first).to_sentence}" do
             it "finds the median of available durations between the two conditions", :sidekiq_might_not_need_inline do
@@ -56,8 +58,6 @@ module CycleAnalyticsHelpers
             end
 
             context "when the data belongs to another project" do
-              let(:other_project) { create(:project, :repository) }
-
               it "returns nil" do
                 # Use a stub to "trick" the data/condition functions
                 # into using another project. This saves us from having to