Add no-op license helper to CE

Add no-op license helper to CE to make it compatible with EE codebase.
Helper will be overwritten in EE to allow for CE specs to be run under
EE codebase.

https://gitlab.com/gitlab-org/gitlab-ee/issues/6539

ee/spec/support/helpers/ee/license_helpers.rb

 module EE
   module LicenseHelpers
+    extend ActiveSupport::Concern
+
     # Enable/Disable a feature on the License for a spec.
     #
     # Example:
@@ -8,26 +10,29 @@ module EE
     #
     # This enables `geo` and disables `deploy_board` features for a spec.
     # Other features are still enabled/disabled as defined in the license.
-    def stub_licensed_features(features)
-      existing_features = License::FEATURES_BY_PLAN.values.flatten.map(&:to_sym)
-      missing_features = features.keys.map(&:to_sym) - existing_features
 
-      if missing_features.any?
-        subject = missing_features.join(', ')
-        noun = 'feature'.pluralize(missing_features.size)
-        raise ArgumentError, "#{subject} should be defined as licensed #{noun}"
-      end
+    prepended do
+      def stub_licensed_features(features)
+        existing_features = License::FEATURES_BY_PLAN.values.flatten.map(&:to_sym)
+        missing_features = features.keys.map(&:to_sym) - existing_features
+
+        if missing_features.any?
+          subject = missing_features.join(', ')
+          noun = 'feature'.pluralize(missing_features.size)
+          raise ArgumentError, "#{subject} should be defined as licensed #{noun}"
+        end
 
-      allow(License).to receive(:feature_available?).and_call_original
+        allow(License).to receive(:feature_available?).and_call_original
 
-      features.each do |feature, enabled|
-        allow(License).to receive(:feature_available?).with(feature) { enabled }
+        features.each do |feature, enabled|
+          allow(License).to receive(:feature_available?).with(feature) { enabled }
+        end
       end
-    end
 
-    def enable_namespace_license_check!
-      stub_env('IN_MEMORY_APPLICATION_SETTINGS', 'false')
-      ::Gitlab::CurrentSettings.update!(check_namespace_plan: true)
+      def enable_namespace_license_check!
+        stub_env('IN_MEMORY_APPLICATION_SETTINGS', 'false')
+        ::Gitlab::CurrentSettings.update!(check_namespace_plan: true)
+      end
     end
   end
 end

spec/services/quick_actions/interpret_service_spec.rb

@@ -16,7 +16,6 @@ describe QuickActions::InterpretService do
 
   before do
     stub_licensed_features(multiple_issue_assignees: false)
-
     project.add_developer(developer)
   end
 

spec/spec_helper.rb

@@ -68,6 +68,7 @@ RSpec.configure do |config|
     metadata[:type] = match[1].singularize.to_sym if match
   end
 
+  config.include LicenseHelpers
   config.include ActiveJob::TestHelper
   config.include ActiveSupport::Testing::TimeHelpers
   config.include CycleAnalyticsHelpers

spec/support/helpers/license_helper.rb

+# frozen_string_literal: true
+
+# Placeholder module for EE implementation needed for CE specs to be run in EE codebase
+module LicenseHelpers
+  def stub_licensed_features(features)
+    # do nothing
+  end
+end
+
+LicenseHelpers.prepend(EE::LicenseHelpers)