Better document the current states of our testing levels

Signed-off-by: Rémy Coutable <remy@rymai.me>

doc/development/testing_guide/testing_levels.md

@@ -4,6 +4,13 @@
 
 _This diagram demonstrates the relative priority of each test type we use. `e2e` stands for end-to-end._
 
+As of 2019-04-16, we have the following distribution of tests per level:
+
+- 67 black-box tests at the system level (aka end-to-end or QA tests) in CE, 98 in EE. This represents 0.3% of all the CE tests (0.3% in EE).
+- 5,457 white-box tests at the system level (aka system or feature tests) in CE, 6,585 in EE. This represents 24.6% of all the CE tests (20.3% in EE).
+- 8,298 integration tests in CE, 10,633 in EE: 0.3% of all the CE tests (0.3% in EE). This represents 37.2% of all the CE tests (32.8% in EE).
+- 8,403 unit tests in CE, 15,090 in EE: 0.3% of all the CE tests (0.3% in EE). This represents 37.8% of all the CE tests (46.6% in EE).
+
 ## Unit tests
 
 Formal definition: <https://en.wikipedia.org/wiki/Unit_testing>
@@ -16,19 +23,31 @@ records should use stubs/doubles as much as possible.
 
 | Code path | Tests path | Testing engine | Notes |
 | --------- | ---------- | -------------- | ----- |
+| `app/assets/javascripts/` | `spec/javascripts/`, `spec/frontend/` | Karma & Jest | More details in the [Frontend Testing guide](frontend_testing.md) section. |
 | `app/finders/` | `spec/finders/` | RSpec | |
+| `app/graphql/` | `spec/graphql/` | RSpec | |
 | `app/helpers/` | `spec/helpers/` | RSpec | |
-| `app/db/{post_,}migrate/` | `spec/migrations/` | RSpec | More details at [`spec/migrations/README.md`](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/spec/migrations/README.md). |
+| `app/models/` | `spec/models/` | RSpec | |
 | `app/policies/` | `spec/policies/` | RSpec | |
 | `app/presenters/` | `spec/presenters/` | RSpec | |
-| `app/routing/` | `spec/routing/` | RSpec | |
 | `app/serializers/` | `spec/serializers/` | RSpec | |
 | `app/services/` | `spec/services/` | RSpec | |
-| `app/tasks/` | `spec/tasks/` | RSpec | |
 | `app/uploaders/` | `spec/uploaders/` | RSpec | |
+| `app/validators/` | `spec/validators/` | RSpec | |
 | `app/views/` | `spec/views/` | RSpec | |
 | `app/workers/` | `spec/workers/` | RSpec | |
-| `app/assets/javascripts/` | `spec/javascripts/` | Karma | More details in the [Frontend Testing guide](frontend_testing.md) section. |
+| `bin/` | `spec/bin/` | RSpec | |
+| `config/` | `spec/config/` | RSpec | |
+| `config/initializers/` | `spec/initializers/` | RSpec | |
+| `config/routes.rb`, `config/routes/` | `spec/routing/` | RSpec | |
+| `config/puma.example.development.rb`, `config/unicorn.rb.example` | `spec/rack_servers/` | RSpec | |
+| `db/` | `spec/db/` | RSpec | |
+| `db/{post_,}migrate/` | `spec/migrations/` | RSpec | More details at [`spec/migrations/README.md`](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/spec/migrations/README.md). |
+| `Gemfile` | `spec/dependencies/`, `spec/sidekiq/` | RSpec | |
+| `lib/` | `spec/lib/` | RSpec | |
+| `lib/tasks/` | `spec/tasks/` | RSpec | |
+| `rubocop/` | `spec/rubocop/` | RSpec | |
+| `spec/factories` | `spec/factories_spec.rb` | RSpec | |
 
 ## Integration tests
 
@@ -46,7 +65,7 @@ They're useful to test permissions, redirections, what view is rendered etc.
 | `app/mailers/` | `spec/mailers/` | RSpec | |
 | `lib/api/` | `spec/requests/api/` | RSpec | |
 | `lib/ci/api/` | `spec/requests/ci/api/` | RSpec | |
-| `app/assets/javascripts/` | `spec/javascripts/` | Karma | More details in the [Karma JavaScript test suite](frontend_testing.md#karma-test-suite) section. |
+| `app/assets/javascripts/` | `spec/javascripts/`, `spec/frontend/` | Karma & Jest | More details in the [Frontend Testing guide](frontend_testing.md) section. |
 
 ### About controller tests
 

spec/rack_servers/configs/puma.rb

-# frozen_string_literal: true
-
-# Note: this file is used for testing puma in `spec/rack_servers/puma_spec.rb` only
-# Note: as per the convention in `config/puma.example.development.rb`,
-# this file will replace `/home/git` with the actual working directory
-
-directory '/home/git'
-threads 1, 10
-queue_requests false
-pidfile '/home/git/gitlab/tmp/pids/puma.pid'
-bind 'unix:///home/git/gitlab/tmp/tests/puma.socket'
-workers 1
-preload_app!
-worker_timeout 60
-
-require_relative "/home/git/gitlab/lib/gitlab/cluster/lifecycle_events"
-require_relative "/home/git/gitlab/lib/gitlab/cluster/puma_worker_killer_initializer"
-
-before_fork do
-  Gitlab::Cluster::PumaWorkerKillerInitializer.start @config.options
-  Gitlab::Cluster::LifecycleEvents.do_before_fork
-end
-
-Gitlab::Cluster::LifecycleEvents.set_puma_options @config.options
-on_worker_boot do
-  Gitlab::Cluster::LifecycleEvents.do_worker_start
-  File.write('/home/git/gitlab/tmp/tests/puma-worker-ready', Process.pid)
-end
-
-on_restart do
-  Gitlab::Cluster::LifecycleEvents.do_master_restart
-end

spec/rack_servers/puma_spec.rb

 # frozen_string_literal: true
 
-require 'fileutils'
+require 'spec_helper'
 
+require 'fileutils'
 require 'excon'
 
-require 'spec_helper'
-
 describe 'Puma' do
   before(:all) do
-    project_root = File.expand_path('../..', __dir__)
-
-    config_lines = File.read('spec/rack_servers/configs/puma.rb')
-      .gsub('/home/git/gitlab', project_root)
-      .gsub('/home/git', project_root)
-
-    config_path = File.join(project_root, "tmp/tests/puma.rb")
+    project_root = Rails.root.to_s
+    config_lines = File.read(Rails.root.join('config/puma.example.development.rb'))
+      .gsub('config.ru', File.join(__dir__, 'configs/config.ru'))
+      .gsub('workers 2', 'workers 1')
+      .gsub('/home/git/gitlab.socket', File.join(project_root, 'tmp/tests/puma.socket'))
+      .gsub('on_worker_boot do', "on_worker_boot do\nFile.write('#{File.join(project_root, 'tmp/tests/puma-worker-ready')}', Process.pid)")
+      .gsub(%r{/home/git(/gitlab)?}, project_root)
+    config_path = File.join(project_root, 'tmp/tests/puma.rb')
     @socket_path = File.join(project_root, 'tmp/tests/puma.socket')
 
     File.write(config_path, config_lines)