Add latest changes from gitlab-org/gitlab@13-9-stable-eev13.9.0-rc42

16 files changed, 2611 insertions, 4 deletions

diff --git a/spec/tooling/danger/base_linter_spec.rb b/spec/tooling/danger/base_linter_spec.rb
new file mode 100644
index 00000000000..54d8f3dc1f7
--- /dev/null
+++ b/spec/tooling/danger/base_linter_spec.rb
@@ -0,0 +1,192 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/base_linter'
+
+RSpec.describe Tooling::Danger::BaseLinter do
+  let(:commit_class) do
+    Struct.new(:message, :sha, :diff_parent)
+  end
+
+  let(:commit_message) { 'A commit message' }
+  let(:commit) { commit_class.new(commit_message, anything, anything) }
+
+  subject(:commit_linter) { described_class.new(commit) }
+
+  describe '#failed?' do
+    context 'with no failures' do
+      it { expect(commit_linter).not_to be_failed }
+    end
+
+    context 'with failures' do
+      before do
+        commit_linter.add_problem(:subject_too_long, described_class.subject_description)
+      end
+
+      it { expect(commit_linter).to be_failed }
+    end
+  end
+
+  describe '#add_problem' do
+    it 'stores messages in #failures' do
+      commit_linter.add_problem(:subject_too_long, '%s')
+
+      expect(commit_linter.problems).to eq({ subject_too_long: described_class.problems_mapping[:subject_too_long] })
+    end
+  end
+
+  shared_examples 'a valid commit' do
+    it 'does not have any problem' do
+      commit_linter.lint_subject
+
+      expect(commit_linter.problems).to be_empty
+    end
+  end
+
+  describe '#lint_subject' do
+    context 'when subject valid' do
+      it_behaves_like 'a valid commit'
+    end
+
+    context 'when subject is too short' do
+      let(:commit_message) { 'A B' }
+
+      it 'adds a problem' do
+        expect(commit_linter).to receive(:add_problem).with(:subject_too_short, described_class.subject_description)
+
+        commit_linter.lint_subject
+      end
+    end
+
+    context 'when subject is too long' do
+      let(:commit_message) { 'A B ' + 'C' * described_class::MAX_LINE_LENGTH }
+
+      it 'adds a problem' do
+        expect(commit_linter).to receive(:add_problem).with(:subject_too_long, described_class.subject_description)
+
+        commit_linter.lint_subject
+      end
+    end
+
+    context 'when ignoring length issues for subject having not-ready wording' do
+      using RSpec::Parameterized::TableSyntax
+
+      let(:final_message) { 'A B C' }
+
+      context 'when used as prefix' do
+        where(prefix: [
+          'WIP: ',
+          'WIP:',
+          'wIp:',
+          '[WIP] ',
+          '[WIP]',
+          '[draft]',
+          '[draft] ',
+          '(draft)',
+          '(draft) ',
+          'draft - ',
+          'draft: ',
+          'draft:',
+          'DRAFT:'
+        ])
+
+        with_them do
+          it 'does not have any problems' do
+            commit_message = prefix + final_message + 'D' * (described_class::MAX_LINE_LENGTH - final_message.size)
+            commit = commit_class.new(commit_message, anything, anything)
+
+            linter = described_class.new(commit).lint_subject
+
+            expect(linter.problems).to be_empty
+          end
+        end
+      end
+
+      context 'when used as suffix' do
+        where(suffix: %w[WIP draft])
+
+        with_them do
+          it 'does not have any problems' do
+            commit_message = final_message + 'D' * (described_class::MAX_LINE_LENGTH - final_message.size) + suffix
+            commit = commit_class.new(commit_message, anything, anything)
+
+            linter = described_class.new(commit).lint_subject
+
+            expect(linter.problems).to be_empty
+          end
+        end
+      end
+    end
+
+    context 'when subject does not have enough words and is too long' do
+      let(:commit_message) { 'A ' + 'B' * described_class::MAX_LINE_LENGTH }
+
+      it 'adds a problem' do
+        expect(commit_linter).to receive(:add_problem).with(:subject_too_short, described_class.subject_description)
+        expect(commit_linter).to receive(:add_problem).with(:subject_too_long, described_class.subject_description)
+
+        commit_linter.lint_subject
+      end
+    end
+
+    context 'when subject starts with lowercase' do
+      let(:commit_message) { 'a B C' }
+
+      it 'adds a problem' do
+        expect(commit_linter).to receive(:add_problem).with(:subject_starts_with_lowercase, described_class.subject_description)
+
+        commit_linter.lint_subject
+      end
+    end
+
+    [
+      '[ci skip] A commit message',
+      '[Ci skip] A commit message',
+      '[API] A commit message',
+      'api: A commit message',
+      'API: A commit message',
+      'API: a commit message',
+      'API: a commit message'
+    ].each do |message|
+      context "when subject is '#{message}'" do
+        let(:commit_message) { message }
+
+        it 'does not add a problem' do
+          expect(commit_linter).not_to receive(:add_problem)
+
+          commit_linter.lint_subject
+        end
+      end
+    end
+
+    [
+      '[ci skip]A commit message',
+      '[Ci skip]  A commit message',
+      '[ci skip] a commit message',
+      'api: a commit message',
+      '! A commit message'
+    ].each do |message|
+      context "when subject is '#{message}'" do
+        let(:commit_message) { message }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:subject_starts_with_lowercase, described_class.subject_description)
+
+          commit_linter.lint_subject
+        end
+      end
+    end
+
+    context 'when subject ends with a period' do
+      let(:commit_message) { 'A B C.' }
+
+      it 'adds a problem' do
+        expect(commit_linter).to receive(:add_problem).with(:subject_ends_with_a_period, described_class.subject_description)
+
+        commit_linter.lint_subject
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/changelog_spec.rb b/spec/tooling/danger/changelog_spec.rb
new file mode 100644
index 00000000000..c0eca67ce92
--- /dev/null
+++ b/spec/tooling/danger/changelog_spec.rb
@@ -0,0 +1,228 @@
+# frozen_string_literal: true
+
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/changelog'
+
+RSpec.describe Tooling::Danger::Changelog do
+  include DangerSpecHelper
+
+  let(:added_files) { nil }
+  let(:fake_git) { double('fake-git', added_files: added_files) }
+
+  let(:mr_labels) { nil }
+  let(:mr_json) { nil }
+  let(:fake_gitlab) { double('fake-gitlab', mr_labels: mr_labels, mr_json: mr_json) }
+
+  let(:changes_by_category) { nil }
+  let(:sanitize_mr_title) { nil }
+  let(:ee?) { false }
+  let(:fake_helper) { double('fake-helper', changes_by_category: changes_by_category, sanitize_mr_title: sanitize_mr_title, ee?: ee?) }
+
+  let(:fake_danger) { new_fake_danger.include(described_class) }
+
+  subject(:changelog) { fake_danger.new(git: fake_git, gitlab: fake_gitlab, helper: fake_helper) }
+
+  describe '#required?' do
+    subject { changelog.required? }
+
+    context 'added files contain a migration' do
+      [
+        'db/migrate/20200000000000_new_migration.rb',
+        'db/post_migrate/20200000000000_new_migration.rb'
+      ].each do |file_path|
+        let(:added_files) { [file_path] }
+
+        it { is_expected.to be_truthy }
+      end
+    end
+
+    context 'added files do not contain a migration' do
+      [
+        'app/models/model.rb',
+        'app/assets/javascripts/file.js'
+      ].each do |file_path|
+        let(:added_files) { [file_path] }
+
+        it { is_expected.to be_falsey }
+      end
+    end
+  end
+
+  describe '#optional?' do
+    let(:category_with_changelog) { :backend }
+    let(:label_with_changelog) { 'frontend' }
+    let(:category_without_changelog) { Tooling::Danger::Changelog::NO_CHANGELOG_CATEGORIES.first }
+    let(:label_without_changelog) { Tooling::Danger::Changelog::NO_CHANGELOG_LABELS.first }
+
+    subject { changelog.optional? }
+
+    context 'when MR contains only categories requiring no changelog' do
+      let(:changes_by_category) { { category_without_changelog => nil } }
+      let(:mr_labels) { [] }
+
+      it 'is falsey' do
+        is_expected.to be_falsy
+      end
+    end
+
+    context 'when MR contains a label that require no changelog' do
+      let(:changes_by_category) { { category_with_changelog => nil } }
+      let(:mr_labels) { [label_with_changelog, label_without_changelog] }
+
+      it 'is falsey' do
+        is_expected.to be_falsy
+      end
+    end
+
+    context 'when MR contains a category that require changelog and a category that require no changelog' do
+      let(:changes_by_category) { { category_with_changelog => nil, category_without_changelog => nil } }
+      let(:mr_labels) { [] }
+
+      it 'is truthy' do
+        is_expected.to be_truthy
+      end
+    end
+
+    context 'when MR contains a category that require changelog and a category that require no changelog with changelog label' do
+      let(:changes_by_category) { { category_with_changelog => nil, category_without_changelog => nil } }
+      let(:mr_labels) { ['feature'] }
+
+      it 'is truthy' do
+        is_expected.to be_truthy
+      end
+    end
+
+    context 'when MR contains a category that require changelog and a category that require no changelog with no changelog label' do
+      let(:changes_by_category) { { category_with_changelog => nil, category_without_changelog => nil } }
+      let(:mr_labels) { ['tooling'] }
+
+      it 'is truthy' do
+        is_expected.to be_falsey
+      end
+    end
+  end
+
+  describe '#found' do
+    subject { changelog.found }
+
+    context 'added files contain a changelog' do
+      [
+        'changelogs/unreleased/entry.yml',
+        'ee/changelogs/unreleased/entry.yml'
+      ].each do |file_path|
+        let(:added_files) { [file_path] }
+
+        it { is_expected.to be_truthy }
+      end
+    end
+
+    context 'added files do not contain a changelog' do
+      [
+        'app/models/model.rb',
+        'app/assets/javascripts/file.js'
+      ].each do |file_path|
+        let(:added_files) { [file_path] }
+        it { is_expected.to eq(nil) }
+      end
+    end
+  end
+
+  describe '#ee_changelog?' do
+    subject { changelog.ee_changelog? }
+
+    before do
+      allow(changelog).to receive(:found).and_return(file_path)
+    end
+
+    context 'is ee changelog' do
+      let(:file_path) { 'ee/changelogs/unreleased/entry.yml' }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'is not ee changelog' do
+      let(:file_path) { 'changelogs/unreleased/entry.yml' }
+
+      it { is_expected.to be_falsy }
+    end
+  end
+
+  describe '#modified_text' do
+    let(:mr_json) { { "iid" => 1234, "title" => sanitize_mr_title } }
+
+    subject { changelog.modified_text }
+
+    context "when title is not changed from sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG.md was edited')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).to include('bin/changelog --ee -m 1234 "Fake Title"')
+      end
+    end
+
+    context "when title needs sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'DRAFT: Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG.md was edited')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).to include('bin/changelog --ee -m 1234 "Fake Title"')
+      end
+    end
+  end
+
+  describe '#required_text' do
+    let(:mr_json) { { "iid" => 1234, "title" => sanitize_mr_title } }
+
+    subject { changelog.required_text }
+
+    context "when title is not changed from sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG missing')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).not_to include('--ee')
+      end
+    end
+
+    context "when title needs sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'DRAFT: Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG missing')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).not_to include('--ee')
+      end
+    end
+  end
+
+  describe '#optional_text' do
+    let(:mr_json) { { "iid" => 1234, "title" => sanitize_mr_title } }
+
+    subject { changelog.optional_text }
+
+    context "when title is not changed from sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG missing')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).to include('bin/changelog --ee -m 1234 "Fake Title"')
+      end
+    end
+
+    context "when title needs sanitization", :aggregate_failures do
+      let(:sanitize_mr_title) { 'DRAFT: Fake Title' }
+
+      specify do
+        expect(subject).to include('CHANGELOG missing')
+        expect(subject).to include('bin/changelog -m 1234 "Fake Title"')
+        expect(subject).to include('bin/changelog --ee -m 1234 "Fake Title"')
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/commit_linter_spec.rb b/spec/tooling/danger/commit_linter_spec.rb
new file mode 100644
index 00000000000..694e524af21
--- /dev/null
+++ b/spec/tooling/danger/commit_linter_spec.rb
@@ -0,0 +1,241 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/commit_linter'
+
+RSpec.describe Tooling::Danger::CommitLinter do
+  using RSpec::Parameterized::TableSyntax
+
+  let(:total_files_changed) { 2 }
+  let(:total_lines_changed) { 10 }
+  let(:stats) { { total: { files: total_files_changed, lines: total_lines_changed } } }
+  let(:diff_parent) { Struct.new(:stats).new(stats) }
+  let(:commit_class) do
+    Struct.new(:message, :sha, :diff_parent)
+  end
+
+  let(:commit_message) { 'A commit message' }
+  let(:commit_sha) { 'abcd1234' }
+  let(:commit) { commit_class.new(commit_message, commit_sha, diff_parent) }
+
+  subject(:commit_linter) { described_class.new(commit) }
+
+  describe '#fixup?' do
+    where(:commit_message, :is_fixup) do
+      'A commit message' | false
+      'fixup!' | true
+      'fixup! A commit message' | true
+      'squash!' | true
+      'squash! A commit message' | true
+    end
+
+    with_them do
+      it 'is true when commit message starts with "fixup!" or "squash!"' do
+        expect(commit_linter.fixup?).to be(is_fixup)
+      end
+    end
+  end
+
+  describe '#suggestion?' do
+    where(:commit_message, :is_suggestion) do
+      'A commit message' | false
+      'Apply suggestion to' | true
+      'Apply suggestion to "A commit message"' | true
+    end
+
+    with_them do
+      it 'is true when commit message starts with "Apply suggestion to"' do
+        expect(commit_linter.suggestion?).to be(is_suggestion)
+      end
+    end
+  end
+
+  describe '#merge?' do
+    where(:commit_message, :is_merge) do
+      'A commit message' | false
+      'Merge branch' | true
+      'Merge branch "A commit message"' | true
+    end
+
+    with_them do
+      it 'is true when commit message starts with "Merge branch"' do
+        expect(commit_linter.merge?).to be(is_merge)
+      end
+    end
+  end
+
+  describe '#revert?' do
+    where(:commit_message, :is_revert) do
+      'A commit message' | false
+      'Revert' | false
+      'Revert "' | true
+      'Revert "A commit message"' | true
+    end
+
+    with_them do
+      it 'is true when commit message starts with "Revert \""' do
+        expect(commit_linter.revert?).to be(is_revert)
+      end
+    end
+  end
+
+  describe '#multi_line?' do
+    where(:commit_message, :is_multi_line) do
+      "A commit message" | false
+      "A commit message\n" | false
+      "A commit message\n\n" | false
+      "A commit message\n\nSigned-off-by: User Name <user@name.me>" | false
+      "A commit message\n\nWith details" | true
+    end
+
+    with_them do
+      it 'is true when commit message contains details' do
+        expect(commit_linter.multi_line?).to be(is_multi_line)
+      end
+    end
+  end
+
+  shared_examples 'a valid commit' do
+    it 'does not have any problem' do
+      commit_linter.lint
+
+      expect(commit_linter.problems).to be_empty
+    end
+  end
+
+  describe '#lint' do
+    describe 'separator' do
+      context 'when separator is missing' do
+        let(:commit_message) { "A B C\n" }
+
+        it_behaves_like 'a valid commit'
+      end
+
+      context 'when separator is a blank line' do
+        let(:commit_message) { "A B C\n\nMore details." }
+
+        it_behaves_like 'a valid commit'
+      end
+
+      context 'when separator is missing' do
+        let(:commit_message) { "A B C\nMore details." }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:separator_missing)
+
+          commit_linter.lint
+        end
+      end
+    end
+
+    describe 'details' do
+      context 'when details are valid' do
+        let(:commit_message) { "A B C\n\nMore details." }
+
+        it_behaves_like 'a valid commit'
+      end
+
+      context 'when no details are given and many files are changed' do
+        let(:total_files_changed) { described_class::MAX_CHANGED_FILES_IN_COMMIT + 1 }
+
+        it_behaves_like 'a valid commit'
+      end
+
+      context 'when no details are given and many lines are changed' do
+        let(:total_lines_changed) { described_class::MAX_CHANGED_LINES_IN_COMMIT + 1 }
+
+        it_behaves_like 'a valid commit'
+      end
+
+      context 'when no details are given and many files and lines are changed' do
+        let(:total_files_changed) { described_class::MAX_CHANGED_FILES_IN_COMMIT + 1 }
+        let(:total_lines_changed) { described_class::MAX_CHANGED_LINES_IN_COMMIT + 1 }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:details_too_many_changes)
+
+          commit_linter.lint
+        end
+      end
+
+      context 'when details exceeds the max line length' do
+        let(:commit_message) { "A B C\n\n" + 'D' * (described_class::MAX_LINE_LENGTH + 1) }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:details_line_too_long)
+
+          commit_linter.lint
+        end
+      end
+
+      context 'when details exceeds the max line length including URLs' do
+        let(:commit_message) do
+          "A B C\n\nsome message with https://example.com and https://gitlab.com" + 'D' * described_class::MAX_LINE_LENGTH
+        end
+
+        it_behaves_like 'a valid commit'
+      end
+    end
+
+    describe 'message' do
+      context 'when message includes a text emoji' do
+        let(:commit_message) { "A commit message :+1:" }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:message_contains_text_emoji)
+
+          commit_linter.lint
+        end
+      end
+
+      context 'when message includes a unicode emoji' do
+        let(:commit_message) { "A commit message 🚀" }
+
+        it 'adds a problem' do
+          expect(commit_linter).to receive(:add_problem).with(:message_contains_unicode_emoji)
+
+          commit_linter.lint
+        end
+      end
+
+      context 'when message includes a value that is surrounded by backticks' do
+        let(:commit_message) { "A commit message `%20`" }
+
+        it 'does not add a problem' do
+          expect(commit_linter).not_to receive(:add_problem)
+
+          commit_linter.lint
+        end
+      end
+
+      context 'when message includes a short reference' do
+        [
+          'A commit message to fix #1234',
+          'A commit message to fix !1234',
+          'A commit message to fix &1234',
+          'A commit message to fix %1234',
+          'A commit message to fix gitlab#1234',
+          'A commit message to fix gitlab!1234',
+          'A commit message to fix gitlab&1234',
+          'A commit message to fix gitlab%1234',
+          'A commit message to fix gitlab-org/gitlab#1234',
+          'A commit message to fix gitlab-org/gitlab!1234',
+          'A commit message to fix gitlab-org/gitlab&1234',
+          'A commit message to fix gitlab-org/gitlab%1234',
+          'A commit message to fix "gitlab-org/gitlab%1234"',
+          'A commit message to fix `gitlab-org/gitlab%1234'
+        ].each do |message|
+          let(:commit_message) { message }
+
+          it 'adds a problem' do
+            expect(commit_linter).to receive(:add_problem).with(:message_contains_short_reference)
+
+            commit_linter.lint
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/danger_spec_helper.rb b/spec/tooling/danger/danger_spec_helper.rb
new file mode 100644
index 00000000000..b1e84b3c13d
--- /dev/null
+++ b/spec/tooling/danger/danger_spec_helper.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module DangerSpecHelper
+  def new_fake_danger
+    Class.new do
+      attr_reader :git, :gitlab, :helper
+
+      # rubocop:disable Gitlab/ModuleWithInstanceVariables
+      def initialize(git: nil, gitlab: nil, helper: nil)
+        @git = git
+        @gitlab = gitlab
+        @helper = helper
+      end
+      # rubocop:enable Gitlab/ModuleWithInstanceVariables
+    end
+  end
+end
diff --git a/spec/tooling/danger/emoji_checker_spec.rb b/spec/tooling/danger/emoji_checker_spec.rb
new file mode 100644
index 00000000000..bbd957b3d00
--- /dev/null
+++ b/spec/tooling/danger/emoji_checker_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+
+require_relative '../../../tooling/danger/emoji_checker'
+
+RSpec.describe Tooling::Danger::EmojiChecker do
+  using RSpec::Parameterized::TableSyntax
+
+  describe '#includes_text_emoji?' do
+    where(:text, :includes_emoji) do
+      'Hello World!' | false
+      ':+1:' | true
+      'Hello World! :+1:' | true
+    end
+
+    with_them do
+      it 'is true when text includes a text emoji' do
+        expect(subject.includes_text_emoji?(text)).to be(includes_emoji)
+      end
+    end
+  end
+
+  describe '#includes_unicode_emoji?' do
+    where(:text, :includes_emoji) do
+      'Hello World!' | false
+      '🚀' | true
+      'Hello World! 🚀' | true
+    end
+
+    with_them do
+      it 'is true when text includes a text emoji' do
+        expect(subject.includes_unicode_emoji?(text)).to be(includes_emoji)
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/feature_flag_spec.rb b/spec/tooling/danger/feature_flag_spec.rb
new file mode 100644
index 00000000000..db63116cc37
--- /dev/null
+++ b/spec/tooling/danger/feature_flag_spec.rb
@@ -0,0 +1,157 @@
+# frozen_string_literal: true
+
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/feature_flag'
+
+RSpec.describe Tooling::Danger::FeatureFlag do
+  include DangerSpecHelper
+
+  let(:added_files) { nil }
+  let(:modified_files) { nil }
+  let(:deleted_files) { nil }
+  let(:fake_git) { double('fake-git', added_files: added_files, modified_files: modified_files, deleted_files: deleted_files) }
+
+  let(:mr_labels) { nil }
+  let(:mr_json) { nil }
+  let(:fake_gitlab) { double('fake-gitlab', mr_labels: mr_labels, mr_json: mr_json) }
+
+  let(:changes_by_category) { nil }
+  let(:sanitize_mr_title) { nil }
+  let(:ee?) { false }
+  let(:fake_helper) { double('fake-helper', changes_by_category: changes_by_category, sanitize_mr_title: sanitize_mr_title, ee?: ee?) }
+
+  let(:fake_danger) { new_fake_danger.include(described_class) }
+
+  subject(:feature_flag) { fake_danger.new(git: fake_git, gitlab: fake_gitlab, helper: fake_helper) }
+
+  describe '#feature_flag_files' do
+    let(:feature_flag_files) do
+      [
+        'config/feature_flags/development/entry.yml',
+        'ee/config/feature_flags/ops/entry.yml'
+      ]
+    end
+
+    let(:other_files) do
+      [
+        'app/models/model.rb',
+        'app/assets/javascripts/file.js'
+      ]
+    end
+
+    shared_examples 'an array of Found objects' do |change_type|
+      it 'returns an array of Found objects' do
+        expect(feature_flag.feature_flag_files(change_type: change_type)).to contain_exactly(an_instance_of(described_class::Found), an_instance_of(described_class::Found))
+        expect(feature_flag.feature_flag_files(change_type: change_type).map(&:path)).to eq(feature_flag_files)
+      end
+    end
+
+    shared_examples 'an empty array' do |change_type|
+      it 'returns an array of Found objects' do
+        expect(feature_flag.feature_flag_files(change_type: change_type)).to be_empty
+      end
+    end
+
+    describe 'retrieves added feature flag files' do
+      context 'with added added feature flag files' do
+        let(:added_files) { feature_flag_files }
+
+        include_examples 'an array of Found objects', :added
+      end
+
+      context 'without added added feature flag files' do
+        let(:added_files) { other_files }
+
+        include_examples 'an empty array', :added
+      end
+    end
+
+    describe 'retrieves modified feature flag files' do
+      context 'with modified modified feature flag files' do
+        let(:modified_files) { feature_flag_files }
+
+        include_examples 'an array of Found objects', :modified
+      end
+
+      context 'without modified modified feature flag files' do
+        let(:modified_files) { other_files }
+
+        include_examples 'an empty array', :modified
+      end
+    end
+
+    describe 'retrieves deleted feature flag files' do
+      context 'with deleted deleted feature flag files' do
+        let(:deleted_files) { feature_flag_files }
+
+        include_examples 'an array of Found objects', :deleted
+      end
+
+      context 'without deleted deleted feature flag files' do
+        let(:deleted_files) { other_files }
+
+        include_examples 'an empty array', :deleted
+      end
+    end
+  end
+
+  describe described_class::Found do
+    let(:feature_flag_path) { 'config/feature_flags/development/entry.yml' }
+    let(:group) { 'group::source code' }
+    let(:raw_yaml) do
+      YAML.dump('group' => group)
+    end
+
+    subject(:found) { described_class.new(feature_flag_path) }
+
+    before do
+      allow(File).to receive(:read).and_call_original
+      expect(File).to receive(:read).with(feature_flag_path).and_return(raw_yaml)
+    end
+
+    describe '#raw' do
+      it 'returns the raw YAML' do
+        expect(found.raw).to eq(raw_yaml)
+      end
+    end
+
+    describe '#group' do
+      it 'returns the group found in the YAML' do
+        expect(found.group).to eq(group)
+      end
+    end
+
+    describe '#group_match_mr_label?' do
+      subject(:result) { found.group_match_mr_label?(mr_group_label) }
+
+      context 'when MR labels match FF group' do
+        let(:mr_group_label) { 'group::source code' }
+
+        specify { expect(result).to eq(true) }
+      end
+
+      context 'when MR labels does not match FF group' do
+        let(:mr_group_label) { 'group::access' }
+
+        specify { expect(result).to eq(false) }
+      end
+
+      context 'when group is nil' do
+        let(:group) { nil }
+
+        context 'and MR has no group label' do
+          let(:mr_group_label) { nil }
+
+          specify { expect(result).to eq(true) }
+        end
+
+        context 'and MR has a group label' do
+          let(:mr_group_label) { 'group::source code' }
+
+          specify { expect(result).to eq(false) }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/helper_spec.rb b/spec/tooling/danger/helper_spec.rb
new file mode 100644
index 00000000000..c338d138352
--- /dev/null
+++ b/spec/tooling/danger/helper_spec.rb
@@ -0,0 +1,682 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require 'rspec-parameterized'
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/helper'
+
+RSpec.describe Tooling::Danger::Helper do
+  using RSpec::Parameterized::TableSyntax
+  include DangerSpecHelper
+
+  let(:fake_git) { double('fake-git') }
+
+  let(:mr_author) { nil }
+  let(:fake_gitlab) { double('fake-gitlab', mr_author: mr_author) }
+
+  let(:fake_danger) { new_fake_danger.include(described_class) }
+
+  subject(:helper) { fake_danger.new(git: fake_git, gitlab: fake_gitlab) }
+
+  describe '#gitlab_helper' do
+    context 'when gitlab helper is not available' do
+      let(:fake_gitlab) { nil }
+
+      it 'returns nil' do
+        expect(helper.gitlab_helper).to be_nil
+      end
+    end
+
+    context 'when gitlab helper is available' do
+      it 'returns the gitlab helper' do
+        expect(helper.gitlab_helper).to eq(fake_gitlab)
+      end
+    end
+
+    context 'when danger gitlab plugin is not available' do
+      it 'returns nil' do
+        invalid_danger = Class.new do
+          include Tooling::Danger::Helper
+        end.new
+
+        expect(invalid_danger.gitlab_helper).to be_nil
+      end
+    end
+  end
+
+  describe '#release_automation?' do
+    context 'when gitlab helper is not available' do
+      it 'returns false' do
+        expect(helper.release_automation?).to be_falsey
+      end
+    end
+
+    context 'when gitlab helper is available' do
+      context "but the MR author isn't the RELEASE_TOOLS_BOT" do
+        let(:mr_author) { 'johnmarston' }
+
+        it 'returns false' do
+          expect(helper.release_automation?).to be_falsey
+        end
+      end
+
+      context 'and the MR author is the RELEASE_TOOLS_BOT' do
+        let(:mr_author) { described_class::RELEASE_TOOLS_BOT }
+
+        it 'returns true' do
+          expect(helper.release_automation?).to be_truthy
+        end
+      end
+    end
+  end
+
+  describe '#all_changed_files' do
+    subject { helper.all_changed_files }
+
+    it 'interprets a list of changes from the danger git plugin' do
+      expect(fake_git).to receive(:added_files) { %w[a b c.old] }
+      expect(fake_git).to receive(:modified_files) { %w[d e] }
+      expect(fake_git)
+        .to receive(:renamed_files)
+        .at_least(:once)
+        .and_return([{ before: 'c.old', after: 'c.new' }])
+
+      is_expected.to contain_exactly('a', 'b', 'c.new', 'd', 'e')
+    end
+  end
+
+  describe '#changed_lines' do
+    subject { helper.changed_lines('changed_file.rb') }
+
+    before do
+      allow(fake_git).to receive(:diff_for_file).with('changed_file.rb').and_return(diff)
+    end
+
+    context 'when file has diff' do
+      let(:diff) { double(:diff, patch: "+ # New change here\n+ # New change there") }
+
+      it 'returns file changes' do
+        is_expected.to eq(['+ # New change here', '+ # New change there'])
+      end
+    end
+
+    context 'when file has no diff (renamed without changes)' do
+      let(:diff) { nil }
+
+      it 'returns a blank array' do
+        is_expected.to eq([])
+      end
+    end
+  end
+
+  describe "changed_files" do
+    it 'returns list of changed files matching given regex' do
+      expect(helper).to receive(:all_changed_files).and_return(%w[migration.rb usage_data.rb])
+
+      expect(helper.changed_files(/usage_data/)).to contain_exactly('usage_data.rb')
+    end
+  end
+
+  describe '#all_ee_changes' do
+    subject { helper.all_ee_changes }
+
+    it 'returns all changed files starting with ee/' do
+      expect(helper).to receive(:all_changed_files).and_return(%w[fr/ee/beer.rb ee/wine.rb ee/lib/ido.rb ee.k])
+
+      is_expected.to match_array(%w[ee/wine.rb ee/lib/ido.rb])
+    end
+  end
+
+  describe '#ee?' do
+    subject { helper.ee? }
+
+    it 'returns true if CI_PROJECT_NAME if set to gitlab' do
+      stub_env('CI_PROJECT_NAME', 'gitlab')
+      expect(Dir).not_to receive(:exist?)
+
+      is_expected.to be_truthy
+    end
+
+    it 'delegates to CHANGELOG-EE.md existence if CI_PROJECT_NAME is set to something else' do
+      stub_env('CI_PROJECT_NAME', 'something else')
+      expect(Dir).to receive(:exist?).with(File.expand_path('../../../../ee', __dir__)) { true }
+
+      is_expected.to be_truthy
+    end
+
+    it 'returns true if ee exists' do
+      stub_env('CI_PROJECT_NAME', nil)
+      expect(Dir).to receive(:exist?).with(File.expand_path('../../../../ee', __dir__)) { true }
+
+      is_expected.to be_truthy
+    end
+
+    it "returns false if ee doesn't exist" do
+      stub_env('CI_PROJECT_NAME', nil)
+      expect(Dir).to receive(:exist?).with(File.expand_path('../../../../ee', __dir__)) { false }
+
+      is_expected.to be_falsy
+    end
+  end
+
+  describe '#project_name' do
+    subject { helper.project_name }
+
+    it 'returns gitlab if ee? returns true' do
+      expect(helper).to receive(:ee?) { true }
+
+      is_expected.to eq('gitlab')
+    end
+
+    it 'returns gitlab-ce if ee? returns false' do
+      expect(helper).to receive(:ee?) { false }
+
+      is_expected.to eq('gitlab-foss')
+    end
+  end
+
+  describe '#markdown_list' do
+    it 'creates a markdown list of items' do
+      items = %w[a b]
+
+      expect(helper.markdown_list(items)).to eq("* `a`\n* `b`")
+    end
+
+    it 'wraps items in <details> when there are more than 10 items' do
+      items = ('a'..'k').to_a
+
+      expect(helper.markdown_list(items)).to match(%r{<details>[^<]+</details>})
+    end
+  end
+
+  describe '#changes_by_category' do
+    it 'categorizes changed files' do
+      expect(fake_git).to receive(:added_files) { %w[foo foo.md foo.rb foo.js db/migrate/foo lib/gitlab/database/foo.rb qa/foo ee/changelogs/foo.yml] }
+      allow(fake_git).to receive(:modified_files) { [] }
+      allow(fake_git).to receive(:renamed_files) { [] }
+
+      expect(helper.changes_by_category).to eq(
+        backend: %w[foo.rb],
+        database: %w[db/migrate/foo lib/gitlab/database/foo.rb],
+        frontend: %w[foo.js],
+        none: %w[ee/changelogs/foo.yml foo.md],
+        qa: %w[qa/foo],
+        unknown: %w[foo]
+      )
+    end
+  end
+
+  describe '#categories_for_file' do
+    before do
+      allow(fake_git).to receive(:diff_for_file).with('usage_data.rb') { double(:diff, patch: "+ count(User.active)") }
+    end
+
+    where(:path, :expected_categories) do
+      'usage_data.rb'   | [:database, :backend]
+      'doc/foo.md'      | [:docs]
+      'CONTRIBUTING.md' | [:docs]
+      'LICENSE'         | [:docs]
+      'MAINTENANCE.md'  | [:docs]
+      'PHILOSOPHY.md'   | [:docs]
+      'PROCESS.md'      | [:docs]
+      'README.md'       | [:docs]
+
+      'ee/doc/foo'      | [:unknown]
+      'ee/README'       | [:unknown]
+
+      'app/assets/foo'       | [:frontend]
+      'app/views/foo'        | [:frontend]
+      'public/foo'           | [:frontend]
+      'scripts/frontend/foo' | [:frontend]
+      'spec/javascripts/foo' | [:frontend]
+      'spec/frontend/bar'    | [:frontend]
+      'vendor/assets/foo'    | [:frontend]
+      'babel.config.js'      | [:frontend]
+      'jest.config.js'       | [:frontend]
+      'package.json'         | [:frontend]
+      'yarn.lock'            | [:frontend]
+      'config/foo.js'        | [:frontend]
+      'config/deep/foo.js'   | [:frontend]
+
+      'ee/app/assets/foo'       | [:frontend]
+      'ee/app/views/foo'        | [:frontend]
+      'ee/spec/javascripts/foo' | [:frontend]
+      'ee/spec/frontend/bar'    | [:frontend]
+
+      '.gitlab/ci/frontend.gitlab-ci.yml' | %i[frontend engineering_productivity]
+
+      'app/models/foo'             | [:backend]
+      'bin/foo'                    | [:backend]
+      'config/foo'                 | [:backend]
+      'lib/foo'                    | [:backend]
+      'rubocop/foo'                | [:backend]
+      '.rubocop.yml'               | [:backend]
+      '.rubocop_todo.yml'          | [:backend]
+      '.rubocop_manual_todo.yml'   | [:backend]
+      'spec/foo'                   | [:backend]
+      'spec/foo/bar'               | [:backend]
+
+      'ee/app/foo'      | [:backend]
+      'ee/bin/foo'      | [:backend]
+      'ee/spec/foo'     | [:backend]
+      'ee/spec/foo/bar' | [:backend]
+
+      'spec/features/foo'                            | [:test]
+      'ee/spec/features/foo'                         | [:test]
+      'spec/support/shared_examples/features/foo'    | [:test]
+      'ee/spec/support/shared_examples/features/foo' | [:test]
+      'spec/support/shared_contexts/features/foo'    | [:test]
+      'ee/spec/support/shared_contexts/features/foo' | [:test]
+      'spec/support/helpers/features/foo'            | [:test]
+      'ee/spec/support/helpers/features/foo'         | [:test]
+
+      'generator_templates/foo' | [:backend]
+      'vendor/languages.yml'    | [:backend]
+      'file_hooks/examples/'    | [:backend]
+
+      'Gemfile'        | [:backend]
+      'Gemfile.lock'   | [:backend]
+      'Rakefile'       | [:backend]
+      'FOO_VERSION'    | [:backend]
+
+      'Dangerfile'                                            | [:engineering_productivity]
+      'danger/commit_messages/Dangerfile'                     | [:engineering_productivity]
+      'ee/danger/commit_messages/Dangerfile'                  | [:engineering_productivity]
+      'danger/commit_messages/'                               | [:engineering_productivity]
+      'ee/danger/commit_messages/'                            | [:engineering_productivity]
+      '.gitlab-ci.yml'                                        | [:engineering_productivity]
+      '.gitlab/ci/cng.gitlab-ci.yml'                          | [:engineering_productivity]
+      '.gitlab/ci/ee-specific-checks.gitlab-ci.yml'           | [:engineering_productivity]
+      'scripts/foo'                                           | [:engineering_productivity]
+      'tooling/danger/foo'                                    | [:engineering_productivity]
+      'ee/tooling/danger/foo'                                 | [:engineering_productivity]
+      'lefthook.yml'                                          | [:engineering_productivity]
+      '.editorconfig'                                         | [:engineering_productivity]
+      'tooling/bin/find_foss_tests'                           | [:engineering_productivity]
+      '.codeclimate.yml'                                      | [:engineering_productivity]
+      '.gitlab/CODEOWNERS'                                    | [:engineering_productivity]
+
+      'lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml'   | [:ci_template]
+      'lib/gitlab/ci/templates/dotNET-Core.yml'               | [:ci_template]
+
+      'ee/FOO_VERSION' | [:unknown]
+
+      'db/schema.rb'                                              | [:database]
+      'db/structure.sql'                                          | [:database]
+      'db/migrate/foo'                                            | [:database]
+      'db/post_migrate/foo'                                       | [:database]
+      'ee/db/migrate/foo'                                         | [:database]
+      'ee/db/post_migrate/foo'                                    | [:database]
+      'ee/db/geo/migrate/foo'                                     | [:database]
+      'ee/db/geo/post_migrate/foo'                                | [:database]
+      'app/models/project_authorization.rb'                       | [:database]
+      'app/services/users/refresh_authorized_projects_service.rb' | [:database]
+      'lib/gitlab/background_migration.rb'                        | [:database]
+      'lib/gitlab/background_migration/foo'                       | [:database]
+      'ee/lib/gitlab/background_migration/foo'                    | [:database]
+      'lib/gitlab/database.rb'                                    | [:database]
+      'lib/gitlab/database/foo'                                   | [:database]
+      'ee/lib/gitlab/database/foo'                                | [:database]
+      'lib/gitlab/github_import.rb'                               | [:database]
+      'lib/gitlab/github_import/foo'                              | [:database]
+      'lib/gitlab/sql/foo'                                        | [:database]
+      'rubocop/cop/migration/foo'                                 | [:database]
+
+      'db/fixtures/foo.rb'                                 | [:backend]
+      'ee/db/fixtures/foo.rb'                              | [:backend]
+      'doc/api/graphql/reference/gitlab_schema.graphql'    | [:backend]
+      'doc/api/graphql/reference/gitlab_schema.json'       | [:backend]
+
+      'qa/foo' | [:qa]
+      'ee/qa/foo' | [:qa]
+
+      'changelogs/foo'    | [:none]
+      'ee/changelogs/foo' | [:none]
+      'locale/gitlab.pot' | [:none]
+
+      'FOO'          | [:unknown]
+      'foo'          | [:unknown]
+
+      'foo/bar.rb'  | [:backend]
+      'foo/bar.js'  | [:frontend]
+      'foo/bar.txt' | [:none]
+      'foo/bar.md'  | [:none]
+    end
+
+    with_them do
+      subject { helper.categories_for_file(path) }
+
+      it { is_expected.to eq(expected_categories) }
+    end
+
+    context 'having specific changes' do
+      where(:expected_categories, :patch, :changed_files) do
+        [:database, :backend] | '+ count(User.active)'                         | ['usage_data.rb', 'lib/gitlab/usage_data.rb', 'ee/lib/ee/gitlab/usage_data.rb']
+        [:database, :backend] | '+ estimate_batch_distinct_count(User.active)' | ['usage_data.rb']
+        [:backend]            | '+ alt_usage_data(User.active)'                | ['usage_data.rb']
+        [:backend]            | '+ count(User.active)'                         | ['user.rb']
+        [:backend]            | '+ count(User.active)'                         | ['usage_data/topology.rb']
+        [:backend]            | '+ foo_count(User.active)'                     | ['usage_data.rb']
+      end
+
+      with_them do
+        it 'has the correct categories' do
+          changed_files.each do |file|
+            allow(fake_git).to receive(:diff_for_file).with(file) { double(:diff, patch: patch) }
+
+            expect(helper.categories_for_file(file)).to eq(expected_categories)
+          end
+        end
+      end
+    end
+  end
+
+  describe '#label_for_category' do
+    where(:category, :expected_label) do
+      :backend   | '~backend'
+      :database  | '~database'
+      :docs      | '~documentation'
+      :foo       | '~foo'
+      :frontend  | '~frontend'
+      :none      | ''
+      :qa        | '~QA'
+      :engineering_productivity | '~"Engineering Productivity" for CI, Danger'
+      :ci_template | '~"ci::templates"'
+    end
+
+    with_them do
+      subject { helper.label_for_category(category) }
+
+      it { is_expected.to eq(expected_label) }
+    end
+  end
+
+  describe '#new_teammates' do
+    it 'returns an array of Teammate' do
+      usernames = %w[filipa iamphil]
+
+      teammates = helper.new_teammates(usernames)
+
+      expect(teammates.map(&:username)).to eq(usernames)
+    end
+  end
+
+  describe '#mr_title' do
+    it 'returns "" when `gitlab_helper` is unavailable' do
+      expect(helper).to receive(:gitlab_helper).and_return(nil)
+
+      expect(helper.mr_title).to eq('')
+    end
+
+    it 'returns the MR title when `gitlab_helper` is available' do
+      mr_title = 'My MR title'
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('title' => mr_title)
+
+      expect(helper.mr_title).to eq(mr_title)
+    end
+  end
+
+  describe '#mr_web_url' do
+    it 'returns "" when `gitlab_helper` is unavailable' do
+      expect(helper).to receive(:gitlab_helper).and_return(nil)
+
+      expect(helper.mr_web_url).to eq('')
+    end
+
+    it 'returns the MR web_url when `gitlab_helper` is available' do
+      mr_web_url = 'https://gitlab.com/gitlab-org/gitlab/-/merge_requests/1'
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('web_url' => mr_web_url)
+
+      expect(helper.mr_web_url).to eq(mr_web_url)
+    end
+  end
+
+  describe '#mr_target_branch' do
+    it 'returns "" when `gitlab_helper` is unavailable' do
+      expect(helper).to receive(:gitlab_helper).and_return(nil)
+
+      expect(helper.mr_target_branch).to eq('')
+    end
+
+    it 'returns the MR web_url when `gitlab_helper` is available' do
+      mr_target_branch = 'main'
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('target_branch' => mr_target_branch)
+
+      expect(helper.mr_target_branch).to eq(mr_target_branch)
+    end
+  end
+
+  describe '#security_mr?' do
+    it 'returns false when on a normal merge request' do
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('web_url' => 'https://gitlab.com/gitlab-org/gitlab/-/merge_requests/1')
+
+      expect(helper).not_to be_security_mr
+    end
+
+    it 'returns true when on a security merge request' do
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('web_url' => 'https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/1')
+
+      expect(helper).to be_security_mr
+    end
+  end
+
+  describe '#draft_mr?' do
+    it 'returns true for a draft MR' do
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('title' => 'Draft: My MR title')
+
+      expect(helper).to be_draft_mr
+    end
+
+    it 'returns false for non draft MR' do
+      expect(fake_gitlab).to receive(:mr_json)
+        .and_return('title' => 'My MR title')
+
+      expect(helper).not_to be_draft_mr
+    end
+  end
+
+  describe '#cherry_pick_mr?' do
+    context 'when MR title does not mention a cherry-pick' do
+      it 'returns false' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('title' => 'Add feature xyz')
+
+        expect(helper).not_to be_cherry_pick_mr
+      end
+    end
+
+    context 'when MR title mentions a cherry-pick' do
+      [
+        'Cherry Pick !1234',
+        'cherry-pick !1234',
+        'CherryPick !1234'
+      ].each do |mr_title|
+        it 'returns true' do
+          expect(fake_gitlab).to receive(:mr_json)
+            .and_return('title' => mr_title)
+
+          expect(helper).to be_cherry_pick_mr
+        end
+      end
+    end
+  end
+
+  describe '#run_all_rspec_mr?' do
+    context 'when MR title does not mention RUN ALL RSPEC' do
+      it 'returns false' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('title' => 'Add feature xyz')
+
+        expect(helper).not_to be_run_all_rspec_mr
+      end
+    end
+
+    context 'when MR title mentions RUN ALL RSPEC' do
+      it 'returns true' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('title' => 'Add feature xyz RUN ALL RSPEC')
+
+        expect(helper).to be_run_all_rspec_mr
+      end
+    end
+  end
+
+  describe '#run_as_if_foss_mr?' do
+    context 'when MR title does not mention RUN AS-IF-FOSS' do
+      it 'returns false' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('title' => 'Add feature xyz')
+
+        expect(helper).not_to be_run_as_if_foss_mr
+      end
+    end
+
+    context 'when MR title mentions RUN AS-IF-FOSS' do
+      it 'returns true' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('title' => 'Add feature xyz RUN AS-IF-FOSS')
+
+        expect(helper).to be_run_as_if_foss_mr
+      end
+    end
+  end
+
+  describe '#stable_branch?' do
+    it 'returns false when `gitlab_helper` is unavailable' do
+      expect(helper).to receive(:gitlab_helper).and_return(nil)
+
+      expect(helper).not_to be_stable_branch
+    end
+
+    context 'when MR target branch is not a stable branch' do
+      it 'returns false' do
+        expect(fake_gitlab).to receive(:mr_json)
+          .and_return('target_branch' => 'my-feature-branch')
+
+        expect(helper).not_to be_stable_branch
+      end
+    end
+
+    context 'when MR target branch is a stable branch' do
+      %w[
+        13-1-stable-ee
+        13-1-stable-ee-patch-1
+      ].each do |target_branch|
+        it 'returns true' do
+          expect(fake_gitlab).to receive(:mr_json)
+            .and_return('target_branch' => target_branch)
+
+          expect(helper).to be_stable_branch
+        end
+      end
+    end
+  end
+
+  describe '#mr_has_label?' do
+    it 'returns false when `gitlab_helper` is unavailable' do
+      expect(helper).to receive(:gitlab_helper).and_return(nil)
+
+      expect(helper.mr_has_labels?('telemetry')).to be_falsey
+    end
+
+    context 'when mr has labels' do
+      before do
+        mr_labels = ['telemetry', 'telemetry::reviewed']
+        expect(fake_gitlab).to receive(:mr_labels).and_return(mr_labels)
+      end
+
+      it 'returns true with a matched label' do
+        expect(helper.mr_has_labels?('telemetry')).to be_truthy
+      end
+
+      it 'returns false with unmatched label' do
+        expect(helper.mr_has_labels?('database')).to be_falsey
+      end
+
+      it 'returns true with an array of labels' do
+        expect(helper.mr_has_labels?(['telemetry', 'telemetry::reviewed'])).to be_truthy
+      end
+
+      it 'returns true with multi arguments with matched labels' do
+        expect(helper.mr_has_labels?('telemetry', 'telemetry::reviewed')).to be_truthy
+      end
+
+      it 'returns false with multi arguments with unmatched labels' do
+        expect(helper.mr_has_labels?('telemetry', 'telemetry::non existing')).to be_falsey
+      end
+    end
+  end
+
+  describe '#labels_list' do
+    let(:labels) { ['telemetry', 'telemetry::reviewed'] }
+
+    it 'composes the labels string' do
+      expect(helper.labels_list(labels)).to eq('~"telemetry", ~"telemetry::reviewed"')
+    end
+
+    context 'when passing a separator' do
+      it 'composes the labels string with the given separator' do
+        expect(helper.labels_list(labels, sep: ' ')).to eq('~"telemetry" ~"telemetry::reviewed"')
+      end
+    end
+
+    it 'returns empty string for empty array' do
+      expect(helper.labels_list([])).to eq('')
+    end
+  end
+
+  describe '#prepare_labels_for_mr' do
+    it 'composes the labels string' do
+      mr_labels = ['telemetry', 'telemetry::reviewed']
+
+      expect(helper.prepare_labels_for_mr(mr_labels)).to eq('/label ~"telemetry" ~"telemetry::reviewed"')
+    end
+
+    it 'returns empty string for empty array' do
+      expect(helper.prepare_labels_for_mr([])).to eq('')
+    end
+  end
+
+  describe '#has_ci_changes?' do
+    context 'when .gitlab/ci is changed' do
+      it 'returns true' do
+        expect(helper).to receive(:all_changed_files).and_return(%w[migration.rb .gitlab/ci/test.yml])
+
+        expect(helper.has_ci_changes?).to be_truthy
+      end
+    end
+
+    context 'when .gitlab-ci.yml is changed' do
+      it 'returns true' do
+        expect(helper).to receive(:all_changed_files).and_return(%w[migration.rb .gitlab-ci.yml])
+
+        expect(helper.has_ci_changes?).to be_truthy
+      end
+    end
+
+    context 'when neither .gitlab/ci/ or .gitlab-ci.yml is changed' do
+      it 'returns false' do
+        expect(helper).to receive(:all_changed_files).and_return(%w[migration.rb nested/.gitlab-ci.yml])
+
+        expect(helper.has_ci_changes?).to be_falsey
+      end
+    end
+  end
+
+  describe '#group_label' do
+    it 'returns nil when no group label is present' do
+      expect(helper.group_label(%w[foo bar])).to be_nil
+    end
+
+    it 'returns the group label when a group label is present' do
+      expect(helper.group_label(['foo', 'group::source code', 'bar'])).to eq('group::source code')
+    end
+  end
+end
diff --git a/spec/tooling/danger/merge_request_linter_spec.rb b/spec/tooling/danger/merge_request_linter_spec.rb
new file mode 100644
index 00000000000..3273b6b3d07
--- /dev/null
+++ b/spec/tooling/danger/merge_request_linter_spec.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/merge_request_linter'
+
+RSpec.describe Tooling::Danger::MergeRequestLinter do
+  using RSpec::Parameterized::TableSyntax
+
+  let(:mr_class) do
+    Struct.new(:message, :sha, :diff_parent)
+  end
+
+  let(:mr_title) { 'A B ' + 'C' }
+  let(:merge_request) { mr_class.new(mr_title, anything, anything) }
+
+  describe '#lint_subject' do
+    subject(:mr_linter) { described_class.new(merge_request) }
+
+    shared_examples 'a valid mr title' do
+      it 'does not have any problem' do
+        mr_linter.lint
+
+        expect(mr_linter.problems).to be_empty
+      end
+    end
+
+    context 'when subject valid' do
+      it_behaves_like 'a valid mr title'
+    end
+
+    context 'when it is too long' do
+      let(:mr_title) { 'A B ' + 'C' * described_class::MAX_LINE_LENGTH }
+
+      it 'adds a problem' do
+        expect(mr_linter).to receive(:add_problem).with(:subject_too_long, described_class.subject_description)
+
+        mr_linter.lint
+      end
+    end
+
+    describe 'using magic mr run options' do
+      where(run_option: described_class.mr_run_options_regex.split('|') +
+        described_class.mr_run_options_regex.split('|').map! { |x| "[#{x}]" })
+
+      with_them do
+        let(:mr_title) { run_option + ' A B ' + 'C' * (described_class::MAX_LINE_LENGTH - 5) }
+
+        it_behaves_like 'a valid mr title'
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/roulette_spec.rb b/spec/tooling/danger/roulette_spec.rb
new file mode 100644
index 00000000000..1e500a1ed08
--- /dev/null
+++ b/spec/tooling/danger/roulette_spec.rb
@@ -0,0 +1,429 @@
+# frozen_string_literal: true
+
+require 'webmock/rspec'
+require 'timecop'
+
+require_relative '../../../tooling/danger/roulette'
+require 'active_support/testing/time_helpers'
+
+RSpec.describe Tooling::Danger::Roulette do
+  include ActiveSupport::Testing::TimeHelpers
+
+  around do |example|
+    travel_to(Time.utc(2020, 06, 22, 10)) { example.run }
+  end
+
+  let(:backend_available) { true }
+  let(:backend_tz_offset_hours) { 2.0 }
+  let(:backend_maintainer) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'backend-maintainer',
+      'name' => 'Backend maintainer',
+      'role' => 'Backend engineer',
+      'projects' => { 'gitlab' => 'maintainer backend' },
+      'available' => backend_available,
+      'tz_offset_hours' => backend_tz_offset_hours
+    )
+  end
+
+  let(:frontend_reviewer) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'frontend-reviewer',
+      'name' => 'Frontend reviewer',
+      'role' => 'Frontend engineer',
+      'projects' => { 'gitlab' => 'reviewer frontend' },
+      'available' => true,
+      'tz_offset_hours' => 2.0
+    )
+  end
+
+  let(:frontend_maintainer) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'frontend-maintainer',
+      'name' => 'Frontend maintainer',
+      'role' => 'Frontend engineer',
+      'projects' => { 'gitlab' => "maintainer frontend" },
+      'available' => true,
+      'tz_offset_hours' => 2.0
+    )
+  end
+
+  let(:software_engineer_in_test) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'software-engineer-in-test',
+      'name' => 'Software Engineer in Test',
+      'role' => 'Software Engineer in Test, Create:Source Code',
+      'projects' => { 'gitlab' => 'maintainer qa', 'gitlab-qa' => 'maintainer' },
+      'available' => true,
+      'tz_offset_hours' => 2.0
+    )
+  end
+
+  let(:engineering_productivity_reviewer) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'eng-prod-reviewer',
+      'name' => 'EP engineer',
+      'role' => 'Engineering Productivity',
+      'projects' => { 'gitlab' => 'reviewer backend' },
+      'available' => true,
+      'tz_offset_hours' => 2.0
+    )
+  end
+
+  let(:ci_template_reviewer) do
+    Tooling::Danger::Teammate.new(
+      'username' => 'ci-template-maintainer',
+      'name' => 'CI Template engineer',
+      'role' => '~"ci::templates"',
+      'projects' => { 'gitlab' => 'reviewer ci_template' },
+      'available' => true,
+      'tz_offset_hours' => 2.0
+    )
+  end
+
+  let(:teammates) do
+    [
+      backend_maintainer.to_h,
+      frontend_maintainer.to_h,
+      frontend_reviewer.to_h,
+      software_engineer_in_test.to_h,
+      engineering_productivity_reviewer.to_h,
+      ci_template_reviewer.to_h
+    ]
+  end
+
+  let(:teammate_json) do
+    teammates.to_json
+  end
+
+  subject(:roulette) { Object.new.extend(described_class) }
+
+  describe 'Spin#==' do
+    it 'compares Spin attributes' do
+      spin1 = described_class::Spin.new(:backend, frontend_reviewer, frontend_maintainer, false, false)
+      spin2 = described_class::Spin.new(:backend, frontend_reviewer, frontend_maintainer, false, false)
+      spin3 = described_class::Spin.new(:backend, frontend_reviewer, frontend_maintainer, false, true)
+      spin4 = described_class::Spin.new(:backend, frontend_reviewer, frontend_maintainer, true, false)
+      spin5 = described_class::Spin.new(:backend, frontend_reviewer, backend_maintainer, false, false)
+      spin6 = described_class::Spin.new(:backend, backend_maintainer, frontend_maintainer, false, false)
+      spin7 = described_class::Spin.new(:frontend, frontend_reviewer, frontend_maintainer, false, false)
+
+      expect(spin1).to eq(spin2)
+      expect(spin1).not_to eq(spin3)
+      expect(spin1).not_to eq(spin4)
+      expect(spin1).not_to eq(spin5)
+      expect(spin1).not_to eq(spin6)
+      expect(spin1).not_to eq(spin7)
+    end
+  end
+
+  describe '#spin' do
+    let!(:project) { 'gitlab' }
+    let!(:mr_source_branch) { 'a-branch' }
+    let!(:mr_labels) { ['backend', 'devops::create'] }
+    let!(:author) { Tooling::Danger::Teammate.new('username' => 'johndoe') }
+    let(:timezone_experiment) { false }
+    let(:spins) do
+      # Stub the request at the latest time so that we can modify the raw data, e.g. available fields.
+      WebMock
+        .stub_request(:get, described_class::ROULETTE_DATA_URL)
+        .to_return(body: teammate_json)
+
+      subject.spin(project, categories, timezone_experiment: timezone_experiment)
+    end
+
+    before do
+      allow(subject).to receive(:mr_author_username).and_return(author.username)
+      allow(subject).to receive(:mr_labels).and_return(mr_labels)
+      allow(subject).to receive(:mr_source_branch).and_return(mr_source_branch)
+    end
+
+    context 'when timezone_experiment == false' do
+      context 'when change contains backend category' do
+        let(:categories) { [:backend] }
+
+        it 'assigns backend reviewer and maintainer' do
+          expect(spins[0].reviewer).to eq(engineering_productivity_reviewer)
+          expect(spins[0].maintainer).to eq(backend_maintainer)
+          expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false)])
+        end
+
+        context 'when teammate is not available' do
+          let(:backend_available) { false }
+
+          it 'assigns backend reviewer and no maintainer' do
+            expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, nil, false, false)])
+          end
+        end
+      end
+
+      context 'when change contains frontend category' do
+        let(:categories) { [:frontend] }
+
+        it 'assigns frontend reviewer and maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:frontend, frontend_reviewer, frontend_maintainer, false, false)])
+        end
+      end
+
+      context 'when change contains many categories' do
+        let(:categories) { [:frontend, :test, :qa, :engineering_productivity, :ci_template, :backend] }
+
+        it 'has a deterministic sorting order' do
+          expect(spins.map(&:category)).to eq categories.sort
+        end
+      end
+
+      context 'when change contains QA category' do
+        let(:categories) { [:qa] }
+
+        it 'assigns QA maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:qa, nil, software_engineer_in_test, false, false)])
+        end
+      end
+
+      context 'when change contains QA category and another category' do
+        let(:categories) { [:backend, :qa] }
+
+        it 'assigns QA maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false), described_class::Spin.new(:qa, nil, software_engineer_in_test, :maintainer, false)])
+        end
+
+        context 'and author is an SET' do
+          let!(:author) { Tooling::Danger::Teammate.new('username' => software_engineer_in_test.username) }
+
+          it 'assigns QA reviewer' do
+            expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false), described_class::Spin.new(:qa, nil, nil, false, false)])
+          end
+        end
+      end
+
+      context 'when change contains Engineering Productivity category' do
+        let(:categories) { [:engineering_productivity] }
+
+        it 'assigns Engineering Productivity reviewer and fallback to backend maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:engineering_productivity, engineering_productivity_reviewer, backend_maintainer, false, false)])
+        end
+      end
+
+      context 'when change contains CI/CD Template category' do
+        let(:categories) { [:ci_template] }
+
+        it 'assigns CI/CD Template reviewer and fallback to backend maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:ci_template, ci_template_reviewer, backend_maintainer, false, false)])
+        end
+      end
+
+      context 'when change contains test category' do
+        let(:categories) { [:test] }
+
+        it 'assigns corresponding SET' do
+          expect(spins).to eq([described_class::Spin.new(:test, software_engineer_in_test, nil, :maintainer, false)])
+        end
+      end
+    end
+
+    context 'when timezone_experiment == true' do
+      let(:timezone_experiment) { true }
+
+      context 'when change contains backend category' do
+        let(:categories) { [:backend] }
+
+        it 'assigns backend reviewer and maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, true)])
+        end
+
+        context 'when teammate is not in a good timezone' do
+          let(:backend_tz_offset_hours) { 5.0 }
+
+          it 'assigns backend reviewer and no maintainer' do
+            expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, nil, false, true)])
+          end
+        end
+      end
+
+      context 'when change includes a category with timezone disabled' do
+        let(:categories) { [:backend] }
+
+        before do
+          stub_const("#{described_class}::INCLUDE_TIMEZONE_FOR_CATEGORY", backend: false)
+        end
+
+        it 'assigns backend reviewer and maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false)])
+        end
+
+        context 'when teammate is not in a good timezone' do
+          let(:backend_tz_offset_hours) { 5.0 }
+
+          it 'assigns backend reviewer and maintainer' do
+            expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false)])
+          end
+        end
+      end
+    end
+  end
+
+  RSpec::Matchers.define :match_teammates do |expected|
+    match do |actual|
+      expected.each do |expected_person|
+        actual_person_found = actual.find { |actual_person| actual_person.name == expected_person.username }
+
+        actual_person_found &&
+        actual_person_found.name == expected_person.name &&
+        actual_person_found.role == expected_person.role &&
+        actual_person_found.projects == expected_person.projects
+      end
+    end
+  end
+
+  describe '#team' do
+    subject(:team) { roulette.team }
+
+    context 'HTTP failure' do
+      before do
+        WebMock
+          .stub_request(:get, described_class::ROULETTE_DATA_URL)
+          .to_return(status: 404)
+      end
+
+      it 'raises a pretty error' do
+        expect { team }.to raise_error(/Failed to read/)
+      end
+    end
+
+    context 'JSON failure' do
+      before do
+        WebMock
+          .stub_request(:get, described_class::ROULETTE_DATA_URL)
+          .to_return(body: 'INVALID JSON')
+      end
+
+      it 'raises a pretty error' do
+        expect { team }.to raise_error(/Failed to parse/)
+      end
+    end
+
+    context 'success' do
+      before do
+        WebMock
+          .stub_request(:get, described_class::ROULETTE_DATA_URL)
+          .to_return(body: teammate_json)
+      end
+
+      it 'returns an array of teammates' do
+        is_expected.to match_teammates([
+          backend_maintainer,
+          frontend_reviewer,
+          frontend_maintainer,
+          software_engineer_in_test,
+          engineering_productivity_reviewer,
+          ci_template_reviewer
+        ])
+      end
+
+      it 'memoizes the result' do
+        expect(team.object_id).to eq(roulette.team.object_id)
+      end
+    end
+  end
+
+  describe '#project_team' do
+    subject { roulette.project_team('gitlab-qa') }
+
+    before do
+      WebMock
+        .stub_request(:get, described_class::ROULETTE_DATA_URL)
+        .to_return(body: teammate_json)
+    end
+
+    it 'filters team by project_name' do
+      is_expected.to match_teammates([
+        software_engineer_in_test
+      ])
+    end
+  end
+
+  describe '#spin_for_person' do
+    let(:person_tz_offset_hours) { 0.0 }
+    let(:person1) do
+      Tooling::Danger::Teammate.new(
+        'username' => 'user1',
+        'available' => true,
+        'tz_offset_hours' => person_tz_offset_hours
+      )
+    end
+
+    let(:person2) do
+      Tooling::Danger::Teammate.new(
+        'username' => 'user2',
+        'available' => true,
+        'tz_offset_hours' => person_tz_offset_hours)
+    end
+
+    let(:author) do
+      Tooling::Danger::Teammate.new(
+        'username' => 'johndoe',
+        'available' => true,
+        'tz_offset_hours' => 0.0)
+    end
+
+    let(:unavailable) do
+      Tooling::Danger::Teammate.new(
+        'username' => 'janedoe',
+        'available' => false,
+        'tz_offset_hours' => 0.0)
+    end
+
+    before do
+      allow(subject).to receive(:mr_author_username).and_return(author.username)
+    end
+
+    (-4..4).each do |utc_offset|
+      context "when local hour for person is #{10 + utc_offset} (offset: #{utc_offset})" do
+        let(:person_tz_offset_hours) { utc_offset }
+
+        [false, true].each do |timezone_experiment|
+          context "with timezone_experiment == #{timezone_experiment}" do
+            it 'returns a random person' do
+              persons = [person1, person2]
+
+              selected = subject.spin_for_person(persons, random: Random.new, timezone_experiment: timezone_experiment)
+
+              expect(persons.map(&:username)).to include(selected.username)
+            end
+          end
+        end
+      end
+    end
+
+    ((-12..-5).to_a + (5..12).to_a).each do |utc_offset|
+      context "when local hour for person is #{10 + utc_offset} (offset: #{utc_offset})" do
+        let(:person_tz_offset_hours) { utc_offset }
+
+        [false, true].each do |timezone_experiment|
+          context "with timezone_experiment == #{timezone_experiment}" do
+            it 'returns a random person or nil' do
+              persons = [person1, person2]
+
+              selected = subject.spin_for_person(persons, random: Random.new, timezone_experiment: timezone_experiment)
+
+              if timezone_experiment
+                expect(selected).to be_nil
+              else
+                expect(persons.map(&:username)).to include(selected.username)
+              end
+            end
+          end
+        end
+      end
+    end
+
+    it 'excludes unavailable persons' do
+      expect(subject.spin_for_person([unavailable], random: Random.new)).to be_nil
+    end
+
+    it 'excludes mr.author' do
+      expect(subject.spin_for_person([author], random: Random.new)).to be_nil
+    end
+  end
+end
diff --git a/spec/tooling/danger/sidekiq_queues_spec.rb b/spec/tooling/danger/sidekiq_queues_spec.rb
new file mode 100644
index 00000000000..c5fc8592621
--- /dev/null
+++ b/spec/tooling/danger/sidekiq_queues_spec.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require_relative 'danger_spec_helper'
+
+require_relative '../../../tooling/danger/sidekiq_queues'
+
+RSpec.describe Tooling::Danger::SidekiqQueues do
+  using RSpec::Parameterized::TableSyntax
+  include DangerSpecHelper
+
+  let(:fake_git) { double('fake-git') }
+  let(:fake_danger) { new_fake_danger.include(described_class) }
+
+  subject(:sidekiq_queues) { fake_danger.new(git: fake_git) }
+
+  describe '#changed_queue_files' do
+    where(:modified_files, :changed_queue_files) do
+      %w(app/workers/all_queues.yml ee/app/workers/all_queues.yml foo) | %w(app/workers/all_queues.yml ee/app/workers/all_queues.yml)
+      %w(app/workers/all_queues.yml ee/app/workers/all_queues.yml) | %w(app/workers/all_queues.yml ee/app/workers/all_queues.yml)
+      %w(app/workers/all_queues.yml foo) | %w(app/workers/all_queues.yml)
+      %w(ee/app/workers/all_queues.yml foo) | %w(ee/app/workers/all_queues.yml)
+      %w(foo) | %w()
+      %w() | %w()
+    end
+
+    with_them do
+      it do
+        allow(fake_git).to receive(:modified_files).and_return(modified_files)
+
+        expect(sidekiq_queues.changed_queue_files).to match_array(changed_queue_files)
+      end
+    end
+  end
+
+  describe '#added_queue_names' do
+    it 'returns queue names added by this change' do
+      old_queues = { post_receive: nil }
+
+      allow(sidekiq_queues).to receive(:old_queues).and_return(old_queues)
+      allow(sidekiq_queues).to receive(:new_queues).and_return(old_queues.merge(merge: nil, process_commit: nil))
+
+      expect(sidekiq_queues.added_queue_names).to contain_exactly(:merge, :process_commit)
+    end
+  end
+
+  describe '#changed_queue_names' do
+    it 'returns names for queues whose attributes were changed' do
+      old_queues = {
+        merge: { name: :merge, urgency: :low },
+        post_receive: { name: :post_receive, urgency: :high },
+        process_commit: { name: :process_commit, urgency: :high }
+      }
+
+      new_queues = old_queues.merge(mailers: { name: :mailers, urgency: :high },
+                                    post_receive: { name: :post_receive, urgency: :low },
+                                    process_commit: { name: :process_commit, urgency: :low })
+
+      allow(sidekiq_queues).to receive(:old_queues).and_return(old_queues)
+      allow(sidekiq_queues).to receive(:new_queues).and_return(new_queues)
+
+      expect(sidekiq_queues.changed_queue_names).to contain_exactly(:post_receive, :process_commit)
+    end
+
+    it 'ignores removed queues' do
+      old_queues = {
+        merge: { name: :merge, urgency: :low },
+        post_receive: { name: :post_receive, urgency: :high }
+      }
+
+      new_queues = {
+        post_receive: { name: :post_receive, urgency: :low }
+      }
+
+      allow(sidekiq_queues).to receive(:old_queues).and_return(old_queues)
+      allow(sidekiq_queues).to receive(:new_queues).and_return(new_queues)
+
+      expect(sidekiq_queues.changed_queue_names).to contain_exactly(:post_receive)
+    end
+  end
+end
diff --git a/spec/tooling/danger/teammate_spec.rb b/spec/tooling/danger/teammate_spec.rb
new file mode 100644
index 00000000000..f3afdc6e912
--- /dev/null
+++ b/spec/tooling/danger/teammate_spec.rb
@@ -0,0 +1,225 @@
+# frozen_string_literal: true
+
+require_relative '../../../tooling/danger/teammate'
+require 'active_support/testing/time_helpers'
+require 'rspec-parameterized'
+
+RSpec.describe Tooling::Danger::Teammate do
+  using RSpec::Parameterized::TableSyntax
+
+  subject { described_class.new(options) }
+
+  let(:tz_offset_hours) { 2.0 }
+  let(:options) do
+    {
+      'username' => 'luigi',
+      'projects' => projects,
+      'role' => role,
+      'markdown_name' => '[Luigi](https://gitlab.com/luigi) (`@luigi`)',
+      'tz_offset_hours' => tz_offset_hours
+    }
+  end
+
+  let(:capabilities) { ['reviewer backend'] }
+  let(:projects) { { project => capabilities } }
+  let(:role) { 'Engineer, Manage' }
+  let(:labels) { [] }
+  let(:project) { double }
+
+  describe '#==' do
+    it 'compares Teammate username' do
+      joe1 = described_class.new('username' => 'joe', 'projects' => projects)
+      joe2 = described_class.new('username' => 'joe', 'projects' => [])
+      jane1 = described_class.new('username' => 'jane', 'projects' => projects)
+      jane2 = described_class.new('username' => 'jane', 'projects' => [])
+
+      expect(joe1).to eq(joe2)
+      expect(jane1).to eq(jane2)
+      expect(jane1).not_to eq(nil)
+      expect(described_class.new('username' => nil)).not_to eq(nil)
+    end
+  end
+
+  describe '#to_h' do
+    it 'returns the given options' do
+      expect(subject.to_h).to eq(options)
+    end
+  end
+
+  context 'when having multiple capabilities' do
+    let(:capabilities) { ['reviewer backend', 'maintainer frontend', 'trainee_maintainer qa'] }
+
+    it '#any_capability? returns true if the person has any capability for the category in the given project' do
+      expect(subject.any_capability?(project, :backend)).to be_truthy
+      expect(subject.any_capability?(project, :frontend)).to be_truthy
+      expect(subject.any_capability?(project, :qa)).to be_truthy
+      expect(subject.any_capability?(project, :engineering_productivity)).to be_falsey
+    end
+
+    it '#reviewer? supports multiple roles per project' do
+      expect(subject.reviewer?(project, :backend, labels)).to be_truthy
+    end
+
+    it '#traintainer? supports multiple roles per project' do
+      expect(subject.traintainer?(project, :qa, labels)).to be_truthy
+    end
+
+    it '#maintainer? supports multiple roles per project' do
+      expect(subject.maintainer?(project, :frontend, labels)).to be_truthy
+    end
+
+    context 'when labels contain devops::create and the category is test' do
+      let(:labels) { ['devops::create'] }
+
+      context 'when role is Software Engineer in Test, Create' do
+        let(:role) { 'Software Engineer in Test, Create' }
+
+        it '#reviewer? returns true' do
+          expect(subject.reviewer?(project, :test, labels)).to be_truthy
+        end
+
+        it '#maintainer? returns false' do
+          expect(subject.maintainer?(project, :test, labels)).to be_falsey
+        end
+
+        context 'when hyperlink is mangled in the role' do
+          let(:role) { '<a href="#">Software Engineer in Test</a>, Create' }
+
+          it '#reviewer? returns true' do
+            expect(subject.reviewer?(project, :test, labels)).to be_truthy
+          end
+        end
+      end
+
+      context 'when role is Software Engineer in Test' do
+        let(:role) { 'Software Engineer in Test' }
+
+        it '#reviewer? returns false' do
+          expect(subject.reviewer?(project, :test, labels)).to be_falsey
+        end
+      end
+
+      context 'when role is Software Engineer in Test, Manage' do
+        let(:role) { 'Software Engineer in Test, Manage' }
+
+        it '#reviewer? returns false' do
+          expect(subject.reviewer?(project, :test, labels)).to be_falsey
+        end
+      end
+
+      context 'when role is Backend Engineer, Engineering Productivity' do
+        let(:role) { 'Backend Engineer, Engineering Productivity' }
+
+        it '#reviewer? returns true' do
+          expect(subject.reviewer?(project, :engineering_productivity, labels)).to be_truthy
+        end
+
+        it '#maintainer? returns false' do
+          expect(subject.maintainer?(project, :engineering_productivity, labels)).to be_falsey
+        end
+
+        context 'when capabilities include maintainer backend' do
+          let(:capabilities) { ['maintainer backend'] }
+
+          it '#maintainer? returns true' do
+            expect(subject.maintainer?(project, :engineering_productivity, labels)).to be_truthy
+          end
+        end
+
+        context 'when capabilities include maintainer engineering productivity' do
+          let(:capabilities) { ['maintainer engineering_productivity'] }
+
+          it '#maintainer? returns true' do
+            expect(subject.maintainer?(project, :engineering_productivity, labels)).to be_truthy
+          end
+        end
+
+        context 'when capabilities include trainee_maintainer backend' do
+          let(:capabilities) { ['trainee_maintainer backend'] }
+
+          it '#traintainer? returns true' do
+            expect(subject.traintainer?(project, :engineering_productivity, labels)).to be_truthy
+          end
+        end
+      end
+    end
+  end
+
+  context 'when having single capability' do
+    let(:capabilities) { 'reviewer backend' }
+
+    it '#reviewer? supports one role per project' do
+      expect(subject.reviewer?(project, :backend, labels)).to be_truthy
+    end
+
+    it '#traintainer? supports one role per project' do
+      expect(subject.traintainer?(project, :database, labels)).to be_falsey
+    end
+
+    it '#maintainer? supports one role per project' do
+      expect(subject.maintainer?(project, :frontend, labels)).to be_falsey
+    end
+  end
+
+  describe '#local_hour' do
+    include ActiveSupport::Testing::TimeHelpers
+
+    around do |example|
+      travel_to(Time.utc(2020, 6, 23, 10)) { example.run }
+    end
+
+    context 'when author is given' do
+      where(:tz_offset_hours, :expected_local_hour) do
+        -12 | 22
+        -10 | 0
+        2 | 12
+        4 | 14
+        12 | 22
+      end
+
+      with_them do
+        it 'returns the correct local_hour' do
+          expect(subject.local_hour).to eq(expected_local_hour)
+        end
+      end
+    end
+  end
+
+  describe '#markdown_name' do
+    it 'returns markdown name with timezone info' do
+      expect(subject.markdown_name).to eq("#{options['markdown_name']} (UTC+2)")
+    end
+
+    context 'when offset is 1.5' do
+      let(:tz_offset_hours) { 1.5 }
+
+      it 'returns markdown name with timezone info, not truncated' do
+        expect(subject.markdown_name).to eq("#{options['markdown_name']} (UTC+1.5)")
+      end
+    end
+
+    context 'when author is given' do
+      where(:tz_offset_hours, :author_offset, :diff_text) do
+        -12 | -10 | "2 hours behind `@mario`"
+        -10 | -12 | "2 hours ahead of `@mario`"
+        -10 | 2 | "12 hours behind `@mario`"
+        2 | 4 | "2 hours behind `@mario`"
+        4 | 2 | "2 hours ahead of `@mario`"
+        2 | 3 | "1 hour behind `@mario`"
+        3 | 2 | "1 hour ahead of `@mario`"
+        2 | 2 | "same timezone as `@mario`"
+      end
+
+      with_them do
+        it 'returns markdown name with timezone info' do
+          author = described_class.new(options.merge('username' => 'mario', 'tz_offset_hours' => author_offset))
+
+          floored_offset_hours = subject.__send__(:floored_offset_hours)
+          utc_offset = floored_offset_hours >= 0 ? "+#{floored_offset_hours}" : floored_offset_hours
+
+          expect(subject.markdown_name(author: author)).to eq("#{options['markdown_name']} (UTC#{utc_offset}, #{diff_text})")
+        end
+      end
+    end
+  end
+end
diff --git a/spec/tooling/danger/title_linting_spec.rb b/spec/tooling/danger/title_linting_spec.rb
new file mode 100644
index 00000000000..7bc1684cd87
--- /dev/null
+++ b/spec/tooling/danger/title_linting_spec.rb
@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+
+require_relative '../../../tooling/danger/title_linting'
+
+RSpec.describe Tooling::Danger::TitleLinting do
+  using RSpec::Parameterized::TableSyntax
+
+  describe '#sanitize_mr_title' do
+    where(:mr_title, :expected_mr_title) do
+      '`My MR title`' | "\\`My MR title\\`"
+      'WIP: My MR title' | 'My MR title'
+      'Draft: My MR title' | 'My MR title'
+      '(Draft) My MR title' | 'My MR title'
+      '[Draft] My MR title' | 'My MR title'
+      '[DRAFT] My MR title' | 'My MR title'
+      'DRAFT: My MR title' | 'My MR title'
+      'DRAFT: `My MR title`' | "\\`My MR title\\`"
+    end
+
+    with_them do
+      subject { described_class.sanitize_mr_title(mr_title) }
+
+      it { is_expected.to eq(expected_mr_title) }
+    end
+  end
+
+  describe '#remove_draft_flag' do
+    where(:mr_title, :expected_mr_title) do
+      'WIP: My MR title' | 'My MR title'
+      'Draft: My MR title' | 'My MR title'
+      '(Draft) My MR title' | 'My MR title'
+      '[Draft] My MR title' | 'My MR title'
+      '[DRAFT] My MR title' | 'My MR title'
+      'DRAFT: My MR title' | 'My MR title'
+    end
+
+    with_them do
+      subject { described_class.remove_draft_flag(mr_title) }
+
+      it { is_expected.to eq(expected_mr_title) }
+    end
+  end
+
+  describe '#has_draft_flag?' do
+    it 'returns true for a draft title' do
+      expect(described_class.has_draft_flag?('Draft: My MR title')).to be true
+    end
+
+    it 'returns false for non draft title' do
+      expect(described_class.has_draft_flag?('My MR title')).to be false
+    end
+  end
+
+  describe '#has_cherry_pick_flag?' do
+    [
+      'Cherry Pick !1234',
+      'cherry-pick !1234',
+      'CherryPick !1234'
+    ].each do |mr_title|
+      it 'returns true for cherry-pick title' do
+        expect(described_class.has_cherry_pick_flag?(mr_title)).to be true
+      end
+    end
+
+    it 'returns false for non cherry-pick title' do
+      expect(described_class.has_cherry_pick_flag?('My MR title')).to be false
+    end
+  end
+
+  describe '#has_run_all_rspec_flag?' do
+    it 'returns true for a title that includes RUN ALL RSPEC' do
+      expect(described_class.has_run_all_rspec_flag?('My MR title RUN ALL RSPEC')).to be true
+    end
+
+    it 'returns true for a title that does not include RUN ALL RSPEC' do
+      expect(described_class.has_run_all_rspec_flag?('My MR title')).to be false
+    end
+  end
+
+  describe '#has_run_as_if_foss_flag?' do
+    it 'returns true for a title that includes RUN AS-IF-FOSS' do
+      expect(described_class.has_run_as_if_foss_flag?('My MR title RUN AS-IF-FOSS')).to be true
+    end
+
+    it 'returns true for a title that does not include RUN AS-IF-FOSS' do
+      expect(described_class.has_run_as_if_foss_flag?('My MR title')).to be false
+    end
+  end
+end
diff --git a/spec/tooling/danger/weightage/maintainers_spec.rb b/spec/tooling/danger/weightage/maintainers_spec.rb
new file mode 100644
index 00000000000..b99ffe706a4
--- /dev/null
+++ b/spec/tooling/danger/weightage/maintainers_spec.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../../../../tooling/danger/weightage/maintainers'
+
+RSpec.describe Tooling::Danger::Weightage::Maintainers do
+  let(:multiplier) { Tooling::Danger::Weightage::CAPACITY_MULTIPLIER }
+  let(:regular_maintainer) { double('Teammate', reduced_capacity: false) }
+  let(:reduced_capacity_maintainer) { double('Teammate', reduced_capacity: true) }
+  let(:maintainers) do
+    [
+      regular_maintainer,
+      reduced_capacity_maintainer
+    ]
+  end
+
+  let(:maintainer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT * multiplier }
+  let(:reduced_capacity_maintainer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT }
+
+  subject(:weighted_maintainers) { described_class.new(maintainers).execute }
+
+  describe '#execute' do
+    it 'weights the maintainers overall' do
+      expect(weighted_maintainers.count).to eq maintainer_count + reduced_capacity_maintainer_count
+    end
+
+    it 'has total count of regular maintainers' do
+      expect(weighted_maintainers.count { |r| r.object_id == regular_maintainer.object_id }).to eq maintainer_count
+    end
+
+    it 'has count of reduced capacity maintainers' do
+      expect(weighted_maintainers.count { |r| r.object_id == reduced_capacity_maintainer.object_id }).to eq reduced_capacity_maintainer_count
+    end
+  end
+end
diff --git a/spec/tooling/danger/weightage/reviewers_spec.rb b/spec/tooling/danger/weightage/reviewers_spec.rb
new file mode 100644
index 00000000000..5693ce7a10c
--- /dev/null
+++ b/spec/tooling/danger/weightage/reviewers_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require_relative '../../../../tooling/danger/weightage/reviewers'
+
+RSpec.describe Tooling::Danger::Weightage::Reviewers do
+  let(:multiplier) { Tooling::Danger::Weightage::CAPACITY_MULTIPLIER }
+  let(:regular_reviewer) { double('Teammate', hungry: false, reduced_capacity: false) }
+  let(:hungry_reviewer) { double('Teammate', hungry: true, reduced_capacity: false) }
+  let(:reduced_capacity_reviewer) { double('Teammate', hungry: false, reduced_capacity: true) }
+  let(:reviewers) do
+    [
+      hungry_reviewer,
+      regular_reviewer,
+      reduced_capacity_reviewer
+    ]
+  end
+
+  let(:regular_traintainer) { double('Teammate', hungry: false, reduced_capacity: false) }
+  let(:hungry_traintainer) { double('Teammate', hungry: true, reduced_capacity: false) }
+  let(:reduced_capacity_traintainer) { double('Teammate', hungry: false, reduced_capacity: true) }
+  let(:traintainers) do
+    [
+      hungry_traintainer,
+      regular_traintainer,
+      reduced_capacity_traintainer
+    ]
+  end
+
+  let(:hungry_reviewer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT * multiplier + described_class::DEFAULT_REVIEWER_WEIGHT }
+  let(:hungry_traintainer_count) { described_class::TRAINTAINER_WEIGHT * multiplier + described_class::DEFAULT_REVIEWER_WEIGHT }
+  let(:reviewer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT * multiplier }
+  let(:traintainer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT * described_class::TRAINTAINER_WEIGHT * multiplier }
+  let(:reduced_capacity_reviewer_count) { Tooling::Danger::Weightage::BASE_REVIEWER_WEIGHT }
+  let(:reduced_capacity_traintainer_count) { described_class::TRAINTAINER_WEIGHT }
+
+  subject(:weighted_reviewers) { described_class.new(reviewers, traintainers).execute }
+
+  describe '#execute', :aggregate_failures do
+    it 'weights the reviewers overall' do
+      reviewers_count = hungry_reviewer_count + reviewer_count + reduced_capacity_reviewer_count
+      traintainers_count = hungry_traintainer_count + traintainer_count + reduced_capacity_traintainer_count
+
+      expect(weighted_reviewers.count).to eq reviewers_count + traintainers_count
+    end
+
+    it 'has total count of hungry reviewers and traintainers' do
+      expect(weighted_reviewers.count(&:hungry)).to eq hungry_reviewer_count + hungry_traintainer_count
+      expect(weighted_reviewers.count { |r| r.object_id == hungry_reviewer.object_id }).to eq hungry_reviewer_count
+      expect(weighted_reviewers.count { |r| r.object_id == hungry_traintainer.object_id }).to eq hungry_traintainer_count
+    end
+
+    it 'has total count of regular reviewers and traintainers' do
+      expect(weighted_reviewers.count { |r| r.object_id == regular_reviewer.object_id }).to eq reviewer_count
+      expect(weighted_reviewers.count { |r| r.object_id == regular_traintainer.object_id }).to eq traintainer_count
+    end
+
+    it 'has count of reduced capacity reviewers' do
+      expect(weighted_reviewers.count(&:reduced_capacity)).to eq reduced_capacity_reviewer_count + reduced_capacity_traintainer_count
+      expect(weighted_reviewers.count { |r| r.object_id == reduced_capacity_reviewer.object_id }).to eq reduced_capacity_reviewer_count
+      expect(weighted_reviewers.count { |r| r.object_id == reduced_capacity_traintainer.object_id }).to eq reduced_capacity_traintainer_count
+    end
+  end
+end
diff --git a/spec/tooling/gitlab_danger_spec.rb b/spec/tooling/gitlab_danger_spec.rb
new file mode 100644
index 00000000000..20ac40d1d2a
--- /dev/null
+++ b/spec/tooling/gitlab_danger_spec.rb
@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+require_relative '../../tooling/gitlab_danger'
+
+RSpec.describe GitlabDanger do
+  let(:gitlab_danger_helper) { nil }
+
+  subject { described_class.new(gitlab_danger_helper) }
+
+  describe '.local_warning_message' do
+    it 'returns an informational message with rules that can run' do
+      expect(described_class.local_warning_message).to eq("==> Only the following Danger rules can be run locally: #{described_class::LOCAL_RULES.join(', ')}")
+    end
+  end
+
+  describe '.success_message' do
+    it 'returns an informational success message' do
+      expect(described_class.success_message).to eq('==> No Danger rule violations!')
+    end
+  end
+
+  describe '#rule_names' do
+    context 'when running locally' do
+      it 'returns local only rules' do
+        expect(subject.rule_names).to eq(described_class::LOCAL_RULES)
+      end
+    end
+
+    context 'when running under CI' do
+      let(:gitlab_danger_helper) { double('danger_gitlab_helper') }
+
+      it 'returns all rules' do
+        expect(subject.rule_names).to eq(described_class::LOCAL_RULES | described_class::CI_ONLY_RULES)
+      end
+    end
+  end
+
+  describe '#html_link' do
+    context 'when running locally' do
+      it 'returns the same string' do
+        str = 'something'
+
+        expect(subject.html_link(str)).to eq(str)
+      end
+    end
+
+    context 'when running under CI' do
+      let(:gitlab_danger_helper) { double('danger_gitlab_helper') }
+
+      it 'returns a HTML link formatted version of the string' do
+        str = 'something'
+        html_formatted_str = %Q{<a href="#{str}">#{str}</a>}
+
+        expect(gitlab_danger_helper).to receive(:html_link).with(str).and_return(html_formatted_str)
+
+        expect(subject.html_link(str)).to eq(html_formatted_str)
+      end
+    end
+  end
+
+  describe '#ci?' do
+    context 'when gitlab_danger_helper is not available' do
+      it 'returns false' do
+        expect(subject.ci?).to be_falsey
+      end
+    end
+
+    context 'when gitlab_danger_helper is available' do
+      let(:gitlab_danger_helper) { double('danger_gitlab_helper') }
+
+      it 'returns true' do
+        expect(subject.ci?).to be_truthy
+      end
+    end
+  end
+end
diff --git a/spec/tooling/lib/tooling/kubernetes_client_spec.rb b/spec/tooling/lib/tooling/kubernetes_client_spec.rb
index 2511295206c..4a84ec09b5c 100644
--- a/spec/tooling/lib/tooling/kubernetes_client_spec.rb
+++ b/spec/tooling/lib/tooling/kubernetes_client_spec.rb
@@ -29,7 +29,7 @@ RSpec.describe Tooling::KubernetesClient do
       specify do
         expect(Gitlab::Popen).to receive(:popen_with_detail)
           .with(["kubectl delete #{described_class::RESOURCE_LIST} " +
-            %(--namespace "#{namespace}" --now --ignore-not-found --include-uninitialized --wait=#{wait} #{release_names_in_command})])
+            %(--namespace "#{namespace}" --now --ignore-not-found --wait=#{wait} #{release_names_in_command})])
           .and_return(Gitlab::Popen::Result.new([], '', '', double(success?: true)))
 
         expect(Gitlab::Popen).to receive(:popen_with_detail)
@@ -44,7 +44,7 @@ RSpec.describe Tooling::KubernetesClient do
     it 'raises an error if the Kubernetes command fails' do
       expect(Gitlab::Popen).to receive(:popen_with_detail)
         .with(["kubectl delete #{described_class::RESOURCE_LIST} " +
-          %(--namespace "#{namespace}" --now --ignore-not-found --include-uninitialized --wait=true -l release="#{release_name}")])
+          %(--namespace "#{namespace}" --now --ignore-not-found --wait=true -l release="#{release_name}")])
         .and_return(Gitlab::Popen::Result.new([], '', '', double(success?: false)))
 
       expect { subject.cleanup_by_release(release_name: release_name) }.to raise_error(described_class::CommandFailedError)
@@ -81,7 +81,7 @@ RSpec.describe Tooling::KubernetesClient do
       specify do
         expect(Gitlab::Popen).to receive(:popen_with_detail)
           .with(["kubectl delete #{resource_type} ".squeeze(' ') +
-            %(--namespace "#{namespace}" --now --ignore-not-found --include-uninitialized --wait=#{wait} #{release_names_in_command})])
+            %(--namespace "#{namespace}" --now --ignore-not-found --wait=#{wait} #{release_names_in_command})])
           .and_return(Gitlab::Popen::Result.new([], '', '', double(success?: true)))
 
         # We're not verifying the output here, just silencing it
@@ -92,7 +92,7 @@ RSpec.describe Tooling::KubernetesClient do
     it 'raises an error if the Kubernetes command fails' do
       expect(Gitlab::Popen).to receive(:popen_with_detail)
         .with(["kubectl delete #{resource_type} " +
-          %(--namespace "#{namespace}" --now --ignore-not-found --include-uninitialized --wait=true #{pod_for_release})])
+          %(--namespace "#{namespace}" --now --ignore-not-found --wait=true #{pod_for_release})])
         .and_return(Gitlab::Popen::Result.new([], '', '', double(success?: false)))
 
       expect { subject.cleanup_by_created_at(resource_type: resource_type, created_before: two_days_ago) }.to raise_error(described_class::CommandFailedError)