Add ios_specific_templates experiment yaml and experiment class

Used for the ios_specific_templates experiment

app/experiments/ios_specific_templates_experiment.rb

+# frozen_string_literal: true
+
+class IosSpecificTemplatesExperiment < ApplicationExperiment
+  before_run(if: :skip_experiment) { throw(:abort) } # rubocop:disable Cop/BanCatchThrow
+
+  private
+
+  def skip_experiment
+    actor_not_able_to_create_pipelines? ||
+      project_targets_non_ios_platforms? ||
+      project_has_gitlab_ci? ||
+      project_has_pipelines?
+  end
+
+  def actor_not_able_to_create_pipelines?
+    !context.actor.is_a?(User) || !context.actor.can?(:create_pipeline, context.project)
+  end
+
+  def project_targets_non_ios_platforms?
+    context.project.project_setting.target_platforms.exclude?('ios')
+  end
+
+  def project_has_gitlab_ci?
+    context.project.has_ci? && context.project.builds_enabled?
+  end
+
+  def project_has_pipelines?
+    context.project.all_pipelines.count > 0
+  end
+end

app/helpers/ci/pipelines_helper.rb

@@ -106,6 +106,12 @@ module Ci
         e.candidate { data[:any_runners_available] = project.active_runners.exists?.to_s }
       end
 
+      experiment(:ios_specific_templates, actor: current_user, project: project, sticky_to: project) do |e|
+        e.candidate do
+          data[:registration_token] = project.runners_token if can?(current_user, :register_project_runners, project)
+        end
+      end
+
       data
     end
 

config/feature_flags/experiment/ios_specific_templates.yml

+---
+name: ios_specific_templates
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/84589
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/356398
+milestone: "14.10"
+type: experiment
+group: group::activation
+default_enabled: false

spec/experiments/ios_specific_templates_experiment_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IosSpecificTemplatesExperiment do
+  subject do
+    described_class.new(actor: user, project: project) do |e|
+      e.candidate { true }
+    end.run
+  end
+
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project, :auto_devops_disabled) }
+
+  let!(:project_setting) { create(:project_setting, project: project, target_platforms: target_platforms) }
+  let(:target_platforms) { %w(ios) }
+
+  before do
+    stub_experiments(ios_specific_templates: :candidate)
+    project.add_developer(user) if user
+  end
+
+  it { is_expected.to be true }
+
+  describe 'skipping the experiment' do
+    context 'no actor' do
+      let_it_be(:user) { nil }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'actor cannot create pipelines' do
+      before do
+        project.add_guest(user)
+      end
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'targeting a non iOS platform' do
+      let(:target_platforms) { [] }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'project has a ci.yaml file' do
+      before do
+        allow(project).to receive(:has_ci?).and_return(true)
+      end
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'project has pipelines' do
+      before do
+        create(:ci_pipeline, project: project)
+      end
+
+      it { is_expected.to be_falsey }
+    end
+  end
+end

spec/helpers/ci/pipelines_helper_spec.rb

@@ -151,5 +151,46 @@ RSpec.describe Ci::PipelinesHelper do
         end
       end
     end
+
+    describe 'the `registration_token` attribute' do
+      subject { data[:registration_token] }
+
+      describe 'when the project is eligible for the `ios_specific_templates` experiment' do
+        let_it_be(:project) { create(:project, :auto_devops_disabled) }
+        let_it_be(:user) { create(:user) }
+
+        before do
+          allow(helper).to receive(:current_user).and_return(user)
+          project.add_developer(user)
+          create(:project_setting, project: project, target_platforms: %w(ios))
+        end
+
+        context 'when the `ios_specific_templates` experiment variant is control' do
+          before do
+            stub_experiments(ios_specific_templates: :control)
+          end
+
+          it { is_expected.to be_nil }
+        end
+
+        context 'when the `ios_specific_templates` experiment variant is candidate' do
+          before do
+            stub_experiments(ios_specific_templates: :candidate)
+          end
+
+          context 'when the user cannot register project runners' do
+            before do
+              allow(helper).to receive(:can?).with(user, :register_project_runners, project).and_return(false)
+            end
+
+            it { is_expected.to be_nil }
+          end
+
+          context 'when the user can register project runners' do
+            it { is_expected.to eq(project.runners_token) }
+          end
+        end
+      end
+    end
   end
 end