Set up experiment for group-only trials

- Remove personal namespaces from the trial namespace selection form
- Add new experiment key for :group_only_trials
- Record the experiment users & some key events

ee/app/controllers/trials_controller.rb

@@ -8,6 +8,7 @@ class TrialsController < ApplicationController
   before_action :check_if_gl_com_or_dev
   before_action :authenticate_user!
   before_action :find_or_create_namespace, only: :apply
+  before_action :record_user_for_group_only_trials_experiment, only: :select
 
   def new
   end
@@ -97,4 +98,8 @@ class TrialsController < ApplicationController
 
     group
   end
+
+  def record_user_for_group_only_trials_experiment
+    record_experiment_user(:group_only_trials)
+  end
 end

ee/app/helpers/ee/trial_helper.rb

@@ -66,6 +66,8 @@ module EE
     end
 
     def trial_user_namespaces
+      return [] if experiment_enabled?(:group_only_trials)
+
       strong_memoize(:trial_user_namespaces) do
         user_namespace = current_user.namespace
         user_namespace.eligible_for_trial? ? [user_namespace] : []

ee/spec/controllers/trials_controller_spec.rb

@@ -120,13 +120,43 @@ RSpec.describe TrialsController do
   end
 
   describe '#select' do
-    subject do
+    def get_select
       get :select
+    end
+
+    subject do
+      get_select
       response
     end
 
     it_behaves_like 'an authenticated endpoint'
     it_behaves_like 'a dot-com only feature'
+
+    context 'when the group-only trials experiment is active' do
+      before do
+        stub_experiment(group_only_trials: true)
+        stub_experiment_for_user(group_only_trials: user_is_in_experiment?)
+      end
+
+      def expected_group_type
+        user_is_in_experiment? ? 'experimental' : 'control'
+      end
+
+      where(user_is_in_experiment?: [true, false])
+
+      with_them do
+        it 'records the user as being part of the experiment' do
+          expect { get_select }.to change { ExperimentUser.count }.by(1)
+          expect(ExperimentUser.last.group_type).to eq(expected_group_type)
+        end
+      end
+    end
+
+    context 'when the group-only trials experiment is not active' do
+      it 'does not record the user as being part of the experiment' do
+        expect { get_select }.not_to change { ExperimentUser.count }
+      end
+    end
   end
 
   describe '#apply' do

lib/gitlab/experimentation.rb

@@ -65,6 +65,9 @@ module Gitlab
       },
       invitation_reminders: {
         tracking_category: 'Growth::Acquisition::Experiment::InvitationReminders'
+      },
+      group_only_trials: {
+        tracking_category: 'Growth::Conversion::Experiment::GroupOnlyTrials'
       }
     }.freeze