Refactor the EE::RegistrationsController spec

- Separate out the two sub-sections of the #update_registration tests
- Improve test readability by dissolving complex table-syntax into
more expressive, direct, & structured tests based on code path
possibilities

ee/spec/controllers/registrations_controller_spec.rb

@@ -63,97 +63,135 @@ RSpec.describe RegistrationsController do
 
     subject(:update_registration) { patch :update_registration, params: { user: { role: 'software_developer', setup_for_company: 'false' } } }
 
-    it { is_expected.to redirect_to dashboard_projects_path }
+    describe 'redirection' do
+      it { is_expected.to redirect_to dashboard_projects_path }
 
-    context 'when part of the onboarding issues experiment' do
-      before do
-        stub_experiment_for_user(onboarding_issues: true)
-      end
-
-      it { is_expected.to redirect_to new_users_sign_up_group_path }
-
-      context 'when in subscription flow' do
+      context 'when part of the onboarding issues experiment' do
         before do
-          allow(controller.helpers).to receive(:in_subscription_flow?).and_return(true)
+          stub_experiment_for_user(onboarding_issues: true)
         end
 
-        it { is_expected.not_to redirect_to new_users_sign_up_group_path }
-      end
+        it { is_expected.to redirect_to new_users_sign_up_group_path }
 
-      context 'when in invitation flow' do
-        before do
-          allow(controller.helpers).to receive(:in_invitation_flow?).and_return(true)
+        context 'when in subscription flow' do
+          before do
+            allow(controller.helpers).to receive(:in_subscription_flow?).and_return(true)
+          end
+
+          it { is_expected.not_to redirect_to new_users_sign_up_group_path }
         end
 
-        it { is_expected.not_to redirect_to new_users_sign_up_group_path }
-      end
+        context 'when in invitation flow' do
+          before do
+            allow(controller.helpers).to receive(:in_invitation_flow?).and_return(true)
+          end
 
-      context 'when in trial flow' do
-        before do
-          allow(controller.helpers).to receive(:in_trial_flow?).and_return(true)
+          it { is_expected.not_to redirect_to new_users_sign_up_group_path }
         end
 
-        it { is_expected.not_to redirect_to new_users_sign_up_group_path }
+        context 'when in trial flow' do
+          before do
+            allow(controller.helpers).to receive(:in_trial_flow?).and_return(true)
+          end
+
+          it { is_expected.not_to redirect_to new_users_sign_up_group_path }
+        end
       end
     end
 
-    describe 'recording experiment user and track for the onboarding issues experiment' do
+    describe 'recording the user and tracking events for the onboarding issues experiment' do
       using RSpec::Parameterized::TableSyntax
 
-      where(:on_gitlab_com, :experiment_enabled, :in_subscription_flow, :in_invitation_flow, :in_trial_flow, :experiment_enabled_for_user, :experiment_group) do
-        false | false | false | false | false | true  | nil
-        false | false | false | true  | false | true  | nil
-        false | false | true  | false | false | true  | nil
-        false | false | true  | true  | false | true  | nil
-        false | true  | false | false | false | true  | nil
-        false | true  | false | true  | false | true  | nil
-        false | true  | true  | false | false | true  | nil
-        false | true  | true  | true  | false | true  | nil
-        true  | false | false | false | false | true  | nil
-        true  | false | false | true  | false | true  | nil
-        true  | false | true  | false | false | true  | nil
-        true  | false | true  | true  | false | true  | nil
-        true  | true  | false | false | false | true  | :experimental
-        true  | true  | false | false | false | false | :control
-        true  | true  | true  | false | false | true  | nil
-        true  | true  | false | true  | false | true  | nil
-        true  | true  | false | false | true  | true  | nil
-        true  | true  | true  | true  | true  | true  | nil
+      let(:on_gitlab_com) { false }
+      let(:experiment_enabled) { false }
+      let(:experiment_enabled_for_user) { false }
+      let(:in_subscription_flow) { false }
+      let(:in_invitation_flow) { false }
+      let(:in_oauth_flow) { false }
+      let(:in_trial_flow) { false }
+
+      before do
+        allow(::Gitlab).to receive(:com?).and_return(on_gitlab_com)
+        stub_experiment(onboarding_issues: experiment_enabled)
+        stub_experiment_for_user(onboarding_issues: experiment_enabled_for_user)
+        allow(controller.helpers).to receive(:in_subscription_flow?).and_return(in_subscription_flow)
+        allow(controller.helpers).to receive(:in_invitation_flow?).and_return(in_invitation_flow)
+        allow(controller.helpers).to receive(:in_oauth_flow?).and_return(in_oauth_flow)
+        allow(controller.helpers).to receive(:in_trial_flow?).and_return(in_trial_flow)
       end
 
-      with_them do
-        before do
-          allow(::Gitlab).to receive(:com?).and_return(on_gitlab_com)
-          stub_experiment(onboarding_issues: experiment_enabled)
-          allow(controller.helpers).to receive(:in_subscription_flow?).and_return(in_subscription_flow)
-          allow(controller.helpers).to receive(:in_invitation_flow?).and_return(in_invitation_flow)
-          allow(controller.helpers).to receive(:in_trial_flow?).and_return(in_trial_flow)
-          stub_experiment_for_user(onboarding_issues: experiment_enabled_for_user)
-        end
+      context 'when on GitLab.com' do
+        let(:on_gitlab_com) { true }
 
-        it 'adds a user to experiments when appropriate' do
-          if experiment_group
-            expect(::Experiment).to receive(:add_user).with(:onboarding_issues, experiment_group, user)
-          else
-            expect(::Experiment).not_to receive(:add_user)
+        context 'and the onboarding issues experiment is enabled' do
+          let(:experiment_enabled) { true }
+
+          context 'and we’re not in the subscription, invitation, oauth, or trial flow' do
+            where(:experiment_enabled_for_user, :group_type) do
+              true  | :experimental
+              false | :control
+            end
+
+            with_them do
+              it 'adds the user to the experiments table with the correct group_type' do
+                expect(::Experiment).to receive(:add_user).with(:onboarding_issues, group_type, user)
+
+                update_registration
+              end
+
+              it 'tracks a signed_up event' do
+                expect(Gitlab::Tracking).to receive(:event).with(
+                  'Growth::Conversion::Experiment::OnboardingIssues',
+                  'signed_up',
+                  label: anything,
+                  property: "#{group_type}_group"
+                )
+
+                update_registration
+              end
+            end
           end
 
-          update_registration
+          context 'but we’re in the subscription, invitation, oauth, or trial flow' do
+            where(:in_subscription_flow, :in_invitation_flow, :in_oauth_flow, :in_trial_flow) do
+              true  | false | false | false
+              false | true  | false | false
+              false | false | true  | false
+              false | false | false | true
+            end
+
+            with_them do
+              it 'does not add the user to the experiments table' do
+                expect(::Experiment).not_to receive(:add_user)
+
+                update_registration
+              end
+
+              it 'does not track a signed_up event' do
+                expect(Gitlab::Tracking).not_to receive(:event)
+
+                update_registration
+              end
+            end
+          end
         end
+      end
 
-        it 'tracks a signed_up event when appropriate' do
-          if experiment_group
-            expect(Gitlab::Tracking).to receive(:event).with(
-              'Growth::Conversion::Experiment::OnboardingIssues',
-              'signed_up',
-              label: anything,
-              property: "#{experiment_group}_group"
-            )
-          else
-            expect(Gitlab::Tracking).not_to receive(:event)
+      context 'when not on GitLab.com, regardless of whether or not the experiment is enabled' do
+        where(experiment_enabled: [true, false])
+
+        with_them do
+          it 'does not add the user to the experiments table' do
+            expect(::Experiment).not_to receive(:add_user)
+
+            update_registration
           end
 
-          update_registration
+          it 'does not track a signed_up event' do
+            expect(Gitlab::Tracking).not_to receive(:event)
+
+            update_registration
+          end
         end
       end
     end