Merge branch 'cross-reference-mr-on-issues' into 'master'

Show merge requests which close current issue

Closes #2903

### What does this MR do
If an issue is to be closed by a merge request the current user has access to, this will be displayed when the user looks at the issue.

![Screenshot_from_2015-10-12_12-10-37](https://gitlab.com/zj/gitlab-ce/uploads/52e429704e73067b24b69801f13ad7bc/Screenshot_from_2015-10-12_12-10-37.png)

/cc @DouweM

See merge request !1569

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/helpers/issues_helper_spec.rb b/spec/helpers/issues_helper_spec.rb
index c08ddb4cae1..78a6b631eb2 100644
--- a/spec/helpers/issues_helper_spec.rb
+++ b/spec/helpers/issues_helper_spec.rb
@@ -117,4 +117,14 @@ describe IssuesHelper do
     end
   end
 
+  describe "#merge_requests_sentence" do
+    subject { merge_requests_sentence(merge_requests)}
+    let(:merge_requests) do
+      [ build(:merge_request, iid: 1), build(:merge_request, iid: 2),
+        build(:merge_request, iid: 3)]
+    end
+
+    it { is_expected.to eq("!1, !2, or !3") }
+  end
+
 end