Add UT for cherry-pick of an existing merge that is not found

spec/models/commit_spec.rb

@@ -212,25 +212,27 @@ eos
         { message: 'Test message', committer: author, author: author }
       end
 
-      let(:merge_commit) do
-        merge_request = create(:merge_request,
+      let(:merge_request) do
+        create(:merge_request,
                source_branch: 'video',
                target_branch: 'master',
                source_project: project,
                author: user)
+      end
 
+      let(:merge_commit) do
         merge_commit_id = repository.merge(user,
                                            merge_request.diff_head_sha,
                                            merge_request,
                                            commit_options)
 
-        merge_commit = repository.commit(merge_commit_id)
-
-        # Manually mark as completed.
-        #
-        merge_request.update(merge_commit_sha: merge_commit_id)
+        repository.commit(merge_commit_id)
+      end
 
-        merge_commit
+      context 'that is found' do
+        before do
+          # Artificially mark as completed.
+          merge_request.update(merge_commit_sha: merge_commit.id)
         end
 
         it do
@@ -245,6 +247,15 @@ eos
           expect(merge_commit.cherry_pick_message(user)).to include(expected_appended_text)
         end
       end
+
+      context "that is existing but not found (eg. it's in progress)" do
+        it do
+          expect(merge_commit.cherry_pick_message(user)).to end_with("(cherry picked from commit #{merge_commit.sha})")
+        end
+      end
+
+    end
+
   end
 
   describe '#reverts_commit?' do