Add test case for clicking line number anchor icon

spec/javascripts/fixtures/line_highlighter.html.haml

@@ -2,7 +2,9 @@
   .file-content
     .line-numbers
       - 1.upto(25) do |i|
-        %a{href: "#L#{i}", id: "L#{i}", 'data-line-number' => i}= i
+        %a{href: "#L#{i}", id: "L#{i}", 'data-line-number' => i}
+          %i.fa.fa-link
+          = i
     %pre.code.highlight
       %code
         - 1.upto(25) do |i|

spec/javascripts/line_highlighter_spec.js.coffee

@@ -48,6 +48,14 @@ describe 'LineHighlighter', ->
       clickLine(13)
       expect(spy).toHaveBeenPrevented()
 
+    it 'handles clicking on a child icon element', ->
+      spy = spyOn(@class, 'setHash').and.callThrough()
+
+      $('#L13 i').mousedown().click()
+
+      expect(spy).toHaveBeenCalledWith(13)
+      expect($('#LC13')).toHaveClass(@css)
+
     describe 'without shiftKey', ->
       it 'highlights one line when clicked', ->
         clickLine(13)