Add debug script

scheduled_job_fixture.rb

+##
+# This is a debug script to reproduce specific scenarios for scheduled jobs (https://gitlab.com/gitlab-org/gitlab-ce/issues/51352)
+# By using this script, you don't need to setup GitLab runner.
+# This script is specifically made for FE/UX engineers. They can quickly check how scheduled jobs behave.
+#
+# *** THIS IS NOT TO BE MERGED ***
+#
+# ### How to use ###
+#
+# ### Prerequisite
+# 1. Create a project
+# 1. Create a .gitlab-ci.yml with the following content
+#
+# ```
+# stages:
+# - build
+# - test
+# - production
+# - rollout 10%
+# - rollout 50%
+# - rollout 100%
+# - cleanup
+# 
+# build:
+# stage: build
+# script: sleep 1s
+# 
+# test:
+# stage: test
+# script: sleep 3s
+# 
+# rollout 10%:
+# stage: rollout 10%
+# script: date
+# when: delayed
+# start_in: 10 seconds
+# allow_failure: false
+# 
+# rollout 50%:
+# stage: rollout 50%
+# script: date
+# when: delayed
+# start_in: 10 seconds
+# allow_failure: false
+# 
+# rollout 100%:
+# stage: rollout 100%
+# script: date
+# when: delayed
+# start_in: 10 seconds
+# allow_failure: false
+# 
+# cleanup:
+# stage: cleanup
+# script: date
+# ```
+#
+# ### How to load this script
+#
+# ```
+# bundle exec rails console                    # Login to rails console
+# require '/path/to/scheduled_job_fixture.rb'  # Load this script
+# ```
+#
+# ### Reproduce the scenario A) ~ Succeccfull timed incremantal rollout ~
+#
+# ````
+# ScheduledJobFixture.new(29, 1).create_pipeline('master')
+# ScheduledJobFixture.new(29, 1).finish_stage_until('test')  # Succeed 'build' and 'test' jobs. 'rollout 10%' job will be scheduled. See the pipeline page
+# ScheduledJobFixture.new(29, 1).finish_stage_until('rollout 10%')  # Succeed `rollout 10%` job. 'rollout 50%' job will be scheduled.
+# ScheduledJobFixture.new(29, 1).finish_stage_until('rollout 50%')  # Succeed `rollout 50%` job. 'rollout 100%' job will be scheduled.
+# ScheduledJobFixture.new(29, 1).finish_stage_until('rollout 100%')  # Succeed `rollout 100%` job. 'cleanup' job will be scheduled.
+# ScheduledJobFixture.new(29, 1).finish_stage_until('cleanup')  # Succeed `cleanup` job. The pipeline becomes green.
+# ```
+class ScheduledJobFixture
+  attr_reader :project
+  attr_reader :user
+
+  def initialize(project_id, user_id)
+    @project = Project.find_by_id(project_id)
+    @user = User.find_by_id(user_id)
+  end
+
+  def create_pipeline(ref)
+    Ci::CreatePipelineService.new(project, user, ref: ref).execute(:web)
+  end
+
+  def finish_stage_until(stage_name)
+    pipeline = Ci::Pipeline.last
+    pipeline.stages.order(:id).each do |stage|
+      stage.builds.map(&:success)
+      stage.update_status
+      pipeline.update_status
+
+      return if stage.name == stage_name
+    end
+  end
+end