Consolidate the logic for SAST prompt experiment

ee/app/controllers/ee/projects/merge_requests_controller.rb

@@ -9,7 +9,7 @@ module EE
         include DescriptionDiffActions
 
         before_action only: [:show] do
-          if @project.licensed_feature_available?(:sast) && can?(current_user, :developer_access, @project)
+          if can_run_sast_experiments_on?(@project)
             experiment(:security_reports_mr_widget_prompt, namespace: @project.namespace).publish
           end
 
@@ -33,6 +33,11 @@ module EE
         feature_category :code_review, [:delete_description_version, :description_diff]
       end
 
+      def can_run_sast_experiments_on?(project)
+        project.licensed_feature_available?(:sast) &&
+          project.feature_available?(:security_and_compliance, current_user)
+      end
+
       def license_scanning_reports
         reports_response(merge_request.compare_license_scanning_reports(current_user))
       end

ee/spec/requests/projects/merge_requests_controller_spec.rb

@@ -13,12 +13,6 @@ RSpec.describe Projects::MergeRequestsController do
 
   describe 'GET #show' do
     before do
-      # To avoid adjusting this controller, we just want to allow these tests to pass. This action wasn't tested before
-      # these were added for the experiment, and already exceeded the threshold.
-      # Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/343375
-      # More: https://docs.gitlab.com/ee/development/query_count_limits.html#disable-query-limiting
-      stub_const('Gitlab::QueryLimiting::Transaction::THRESHOLD', 103)
-
       stub_licensed_features(sast: true)
     end
 
@@ -28,6 +22,10 @@ RSpec.describe Projects::MergeRequestsController do
 
     context 'when the user has developer access' do
       it 'publishes the security_reports_mr_widget_prompt experiment' do
+        # Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/343375
+        # More: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/73034#note_720186839
+        #       https://docs.gitlab.com/ee/development/query_count_limits.html#disable-query-limiting
+        stub_const('Gitlab::QueryLimiting::Transaction::THRESHOLD', 110)
         expect_next_instance_of(SecurityReportsMrWidgetPromptExperiment) do |instance|
           expect(instance).to receive(:publish)
         end
@@ -48,7 +46,7 @@ RSpec.describe Projects::MergeRequestsController do
 
     context 'when the project is not licensed for sast' do
       before do
-        expect(License).to receive(:feature_available?).with(:sast).and_return(false)
+        stub_licensed_features(sast: false)
       end
 
       it 'does not publish the security_reports_mr_widget_prompt experiment' do
@@ -57,6 +55,30 @@ RSpec.describe Projects::MergeRequestsController do
         get_show
       end
     end
+
+    context 'when the project has disabled the security and compliance features' do
+      before do
+        project.project_feature.update_column(:security_and_compliance_access_level, Featurable::DISABLED)
+      end
+
+      it 'does not publish the security_reports_mr_widget_prompt experiment' do
+        expect(SecurityReportsMrWidgetPromptExperiment).not_to receive(:new)
+
+        get_show
+      end
+    end
+
+    context 'when the the user is a guest' do
+      let(:user) { create(:user) }
+
+      it 'does not publish the security_reports_mr_widget_prompt experiment' do
+        project.add_guest(user)
+
+        expect(SecurityReportsMrWidgetPromptExperiment).not_to receive(:new)
+
+        get_show
+      end
+    end
   end
 
   describe 'GET #edit' do