Add toHaveFocus jasmine expectation

spec/spec-helper.coffee

@@ -159,6 +159,17 @@ addCustomMatchers = (spec) ->
       @message = -> return "Expected path '" + @actual + "'" + notText + " to exist."
       fs.existsSync(@actual)
 
+    toHaveFocus: ->
+      notText = this.isNot and " not" or ""
+      if not document.hasFocus()
+        console.error "Specs will fail because the Dev Tools have focus. To fix this close the Dev Tools or click the spec runner."
+
+      @message = -> return "Expected element '" + @actual + "' or its descendants" + notText + " to have focus."
+      element = @actual
+      element = element.get(0) if element.jquery
+      element.webkitMatchesSelector(":focus") or element.querySelector(":focus")
+
+
 window.keyIdentifierForKey = (key) ->
   if key.length > 1 # named key
     key