Fix GitlabMarkdownHelper spec

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -51,8 +51,8 @@ describe GitlabMarkdownHelper do
     end
 
     it "should not touch HTML entities" do
-      allow(@project.issues).to receive(:where).
-        with(id: '39').and_return([issue])
+      allow(@project).to receive(:issue_exists?).
+        with(39).and_return([issue])
       actual = 'We'll accept good pull requests.'
       expect(gfm(actual)).to eq("We'll accept good pull requests.")
     end
@@ -609,7 +609,7 @@ describe GitlabMarkdownHelper do
     end
 
     it "should leave ref-like href of 'manual' links untouched" do
-      expect(markdown("why not [inspect !#{merge_request.iid}](http://example.tld/#!#{merge_request.iid})")).to eq("<p>why not <a href=\"http://example.tld/#!#{merge_request.iid}\">inspect </a><a href=\"#{namespace_project_merge_request_path(project.namespace, project, merge_request)}\" title=\"Merge Request: #{merge_request.title}\" class=\"gfm gfm-merge_request \">!#{merge_request.iid}</a><a href=\"http://example.tld/#!#{merge_request.iid}\"></a></p>\n")
+      expect(markdown("why not [inspect !#{merge_request.iid}](http://example.tld/#!#{merge_request.iid})")).to eq("<p>why not <a href=\"http://example.tld/#!#{merge_request.iid}\">inspect </a><a href=\"#{namespace_project_merge_request_path(project.namespace, project, merge_request)}\" title=\"Merge Request: #{merge_request.title}\" class=\"gfm gfm-merge_request\">!#{merge_request.iid}</a><a href=\"http://example.tld/#!#{merge_request.iid}\"></a></p>\n")
     end
 
     it "should leave ref-like src of images untouched" do

spec/lib/gitlab/markdown/commit_range_reference_filter_spec.rb

@@ -38,6 +38,14 @@ module Gitlab::Markdown
           to eq urls.namespace_project_compare_url(project.namespace, project, from: commit1.id, to: commit2.id)
       end
 
+      it 'links to a valid short ID' do
+        reference = "#{commit1.short_id}...#{commit2.id}"
+        reference2 = "#{commit1.id}...#{commit2.short_id}"
+
+        expect(filter("See #{reference}").css('a').first.text).to eq reference
+        expect(filter("See #{reference2}").css('a').first.text).to eq reference2
+      end
+
       it 'links with adjacent text' do
         doc = filter("See (#{reference}.)")
         expect(doc.to_html).to match(/\(<a.+>#{Regexp.escape(reference)}<\/a>\.\)/)