Add `to_reference` for models that support references

Now there is a single source of information for which attribute a model
uses to be referenced, and its special character.

1 files changed, 18 insertions, 3 deletions

diff --git a/spec/models/issue_spec.rb b/spec/models/issue_spec.rb
index 20d823b40e5..4e4f816a26b 100644
--- a/spec/models/issue_spec.rb
+++ b/spec/models/issue_spec.rb
@@ -24,15 +24,30 @@ describe Issue do
     it { is_expected.to belong_to(:milestone) }
   end
 
-  describe "Mass assignment" do
-  end
-
   describe 'modules' do
+    subject { described_class }
+
+    it { is_expected.to include_module(InternalId) }
     it { is_expected.to include_module(Issuable) }
+    it { is_expected.to include_module(Referable) }
+    it { is_expected.to include_module(Sortable) }
+    it { is_expected.to include_module(Taskable) }
   end
 
   subject { create(:issue) }
 
+  describe '#to_reference' do
+    it 'returns a String reference to the object' do
+      expect(subject.to_reference).to eq "##{subject.iid}"
+    end
+
+    it 'supports a cross-project reference' do
+      cross = double('project')
+      expect(subject.to_reference(cross)).
+        to eq "#{subject.project.to_reference}##{subject.iid}"
+    end
+  end
+
   describe '#is_being_reassigned?' do
     it 'returns true if the issue assignee has changed' do
       subject.assignee = create(:user)