Raise an error if an unknown feature is passed to stub_licensed_features

spec/support/ee/license_helpers.rb

@@ -9,6 +9,9 @@ module EE
     # This enables `geo` and disables `deploy_board` features for a spec.
     # Other features are still enabled/disabled as defined in the licence.
     def stub_licensed_features(features)
+      unknown_features = features.keys - License::FEATURE_CODES.keys
+      raise "Unknown features: #{unknown_features.inspect}" unless unknown_features.empty?
+
       allow(License).to receive(:feature_available?).and_call_original
 
       features.each do |feature, enabled|