Make Mentionable#cross_reference_exists? private.

app/models/concerns/mentionable.rb

@@ -41,12 +41,6 @@ module Mentionable
     self
   end
 
-  # Determine whether or not a cross-reference Note has already been created between this Mentionable and
-  # the specified target.
-  def cross_reference_exists?(target)
-    SystemNoteService.cross_reference_exists?(target, local_reference)
-  end
-
   def all_references(current_user = self.author, text = self.mentionable_text)
     ext = Gitlab::ReferenceExtractor.new(self.project, current_user)
     ext.analyze(text)
@@ -111,4 +105,10 @@ module Mentionable
     # Only include changed fields that are mentionable
     source.select { |key, val| mentionable.include?(key) }
   end
+  
+  # Determine whether or not a cross-reference Note has already been created between this Mentionable and
+  # the specified target.
+  def cross_reference_exists?(target)
+    SystemNoteService.cross_reference_exists?(target, local_reference)
+  end
 end

spec/support/mentionable_shared_examples.rb

@@ -86,13 +86,6 @@ shared_examples 'a mentionable' do
 
     subject.create_cross_references!
   end
-
-  it 'detects existing cross-references' do
-    SystemNoteService.cross_reference(mentioned_issue, subject.local_reference, author)
-
-    expect(subject.cross_reference_exists?(mentioned_issue)).to be_truthy
-    expect(subject.cross_reference_exists?(mentioned_mr)).to be_falsey
-  end
 end
 
 shared_examples 'an editable mentionable' do