Fixed tests

app/assets/javascripts/due_date_select.js.coffee

@@ -2,12 +2,14 @@ class @DueDateSelect
   constructor: ->
     # Milestone edit/new form
     $datePicker = $('.datepicker')
-    $dueDate = $('#milestone_due_date')
-    $datePicker.datepicker
-      dateFormat: 'yy-mm-dd'
-      onSelect: (dateText, inst) ->
-        $dueDate.val(dateText)
-    .datepicker('setDate', $.datepicker.parseDate('yy-mm-dd', $dueDate.val()))
+
+    if $datePicker.length
+      $dueDate = $('#milestone_due_date')
+      $datePicker.datepicker
+        dateFormat: 'yy-mm-dd'
+        onSelect: (dateText, inst) ->
+          $dueDate.val(dateText)
+      .datepicker('setDate', $.datepicker.parseDate('yy-mm-dd', $dueDate.val()))
 
     $('.js-clear-due-date').on 'click', (e) ->
       e.preventDefault()