Use to_reference in Mentionable shared examples

spec/support/mentionable_shared_examples.rb

@@ -10,12 +10,12 @@ def common_mentionable_setup
 
   let(:mentioned_issue)  { create(:issue, project: project) }
   let(:mentioned_mr)     { create(:merge_request, :simple, source_project: project) }
-  let(:mentioned_commit) { project.repository.commit }
+  let(:mentioned_commit) { project.commit }
 
   let(:ext_proj)   { create(:project, :public) }
   let(:ext_issue)  { create(:issue, project: ext_proj) }
   let(:ext_mr)     { create(:merge_request, :simple, source_project: ext_proj) }
-  let(:ext_commit) { ext_proj.repository.commit }
+  let(:ext_commit) { ext_proj.commit }
 
   # Override to add known commits to the repository stub.
   let(:extra_commits) { [] }
@@ -23,21 +23,19 @@ def common_mentionable_setup
   # A string that mentions each of the +mentioned_.*+ objects above. Mentionables should add a self-reference
   # to this string and place it in their +mentionable_text+.
   let(:ref_string) do
-    cross = ext_proj.path_with_namespace
-
     <<-MSG.strip_heredoc
       These references are new:
-        Issue:  ##{mentioned_issue.iid}
-        Merge:  !#{mentioned_mr.iid}
-        Commit: #{mentioned_commit.id}
+        Issue:  #{mentioned_issue.to_reference}
+        Merge:  #{mentioned_mr.to_reference}
+        Commit: #{mentioned_commit.to_reference}
 
       This reference is a repeat and should only be mentioned once:
-        Repeat: ##{mentioned_issue.iid}
+        Repeat: #{mentioned_issue.to_reference}
 
       These references are cross-referenced:
-        Issue:  #{cross}##{ext_issue.iid}
-        Merge:  #{cross}!#{ext_mr.iid}
-        Commit: #{cross}@#{ext_commit.short_id}
+        Issue:  #{ext_issue.to_reference(project)}
+        Merge:  #{ext_mr.to_reference(project)}
+        Commit: #{ext_commit.to_reference(project)}
 
       This is a self-reference and should not be mentioned at all:
         Self: #{backref_text}
@@ -109,19 +107,17 @@ shared_examples 'an editable mentionable' do
   it 'creates new cross-reference notes when the mentionable text is edited' do
     subject.save
 
-    cross = ext_proj.path_with_namespace
-
     new_text = <<-MSG
       These references already existed:
-        Issue:  ##{mentioned_issue.iid}
-        Commit: #{mentioned_commit.id}
+        Issue:  #{mentioned_issue.to_reference}
+        Commit: #{mentioned_commit.to_reference}
 
       This cross-project reference already existed:
-        Issue:  #{cross}##{ext_issue.iid}
+        Issue:  #{ext_issue.to_reference(project)}
 
       These two references are introduced in an edit:
-        Issue: ##{new_issues[0].iid}
-        Cross: #{cross}##{new_issues[1].iid}
+        Issue: #{new_issues[0].to_reference}
+        Cross: #{new_issues[1].to_reference(project)}
     MSG
 
     # These three objects were already referenced, and should not receive new