Use class method + private constant to override CE constants on EE

modules

Overrides constants on CommitStatusPresenter and
GitLab::Ci::Status::Build::Failed.

Closes #7204

app/presenters/commit_status_presenter.rb

 # frozen_string_literal: true
 class CommitStatusPresenter < Gitlab::View::Presenter::Delegated
-  prepend ::EE::CommitStatusPresenter
-
   CALLOUT_FAILURE_MESSAGES = {
     unknown_failure: 'There is an unknown failure, please try again',
     script_failure: nil,
@@ -10,12 +8,19 @@ class CommitStatusPresenter < Gitlab::View::Presenter::Delegated
     runner_system_failure: 'There has been a runner system failure, please try again',
     missing_dependency_failure: 'There has been a missing dependency failure',
     runner_unsupported: 'Your runner is outdated, please upgrade your runner'
-  }.merge(EE_CALLOUT_FAILURE_MESSAGES).freeze
+  }.freeze
 
+  private_constant :CALLOUT_FAILURE_MESSAGES
   presents :build
 
+  prepend ::EE::CommitStatusPresenter
+
+  def self.callout_failure_messages
+    CALLOUT_FAILURE_MESSAGES
+  end
+
   def callout_failure_message
-    CALLOUT_FAILURE_MESSAGES.fetch(failure_reason.to_sym)
+    self.class.callout_failure_messages.fetch(failure_reason.to_sym)
   end
 
   def recoverable?

ee/app/presenters/ee/commit_status_presenter.rb

 # frozen_string_literal: true
 module EE
   module CommitStatusPresenter
-    EE_CALLOUT_FAILURE_MESSAGES = {
-      protected_environment_failure: 'The environment this job is deploying to is protected. Only users with permission may successfully run this job'
-    }.freeze
+    extend ActiveSupport::Concern
+
+    prepended do
+      EE_CALLOUT_FAILURE_MESSAGES = const_get(:CALLOUT_FAILURE_MESSAGES).merge(
+        protected_environment_failure: 'The environment this job is deploying to is protected. Only users with permission may successfully run this job'
+      ).freeze
+
+      EE::CommitStatusPresenter.private_constant :EE_CALLOUT_FAILURE_MESSAGES
+    end
+
+    class_methods do
+      def callout_failure_messages
+        EE_CALLOUT_FAILURE_MESSAGES
+      end
+    end
   end
 end

ee/lib/ee/gitlab/ci/status/build/failed.rb

@@ -5,9 +5,21 @@ module EE
       module Status
         module Build
           module Failed
-            EE_REASONS = {
-              protected_environment_failure: 'protected environment failure'
-            }.freeze
+            extend ActiveSupport::Concern
+
+            prepended do
+              EE_REASONS = const_get(:REASONS).merge(
+                protected_environment_failure: 'protected environment failure'
+              ).freeze
+
+              EE::Gitlab::Ci::Status::Build::Failed.private_constant :EE_REASONS
+            end
+
+            class_methods do
+              def reasons
+                EE_REASONS
+              end
+            end
           end
         end
       end

lib/gitlab/ci/status/build/failed.rb

@@ -3,8 +3,6 @@ module Gitlab
     module Status
       module Build
         class Failed < Status::Extended
-          prepend ::EE::Gitlab::Ci::Status::Build::Failed
-
           REASONS = {
             unknown_failure: 'unknown failure',
             script_failure: 'script failure',
@@ -13,7 +11,10 @@ module Gitlab
             runner_system_failure: 'runner system failure',
             missing_dependency_failure: 'missing dependency failure',
             runner_unsupported: 'unsupported runner'
-          }.merge(EE_REASONS).freeze
+          }.freeze
+
+          private_constant :REASONS
+          prepend ::EE::Gitlab::Ci::Status::Build::Failed
 
           def status_tooltip
             base_message
@@ -27,6 +28,10 @@ module Gitlab
             build.failed?
           end
 
+          def self.reasons
+            REASONS
+          end
+
           private
 
           def base_message
@@ -38,7 +43,7 @@ module Gitlab
           end
 
           def failure_reason_message
-            REASONS.fetch(subject.failure_reason.to_sym)
+            self.class.reasons.fetch(subject.failure_reason.to_sym)
           end
         end
       end