Change the directory of Bootstrap from '_assets' to static 'assets'.

assets/vendor/bootstrap/js/tests/unit/affix.js

@@ -0,0 +1,50 @@
+$(function () {
+
+    module('affix')
+
+      test('should provide no conflict', function () {
+        var affix = $.fn.affix.noConflict()
+        ok(!$.fn.affix, 'affix was set back to undefined (org value)')
+        $.fn.affix = affix
+      })
+
+      test('should be defined on jquery object', function () {
+        ok($(document.body).affix, 'affix method is defined')
+      })
+
+      test('should return element', function () {
+        ok($(document.body).affix()[0] == document.body, 'document.body returned')
+      })
+
+      test('should exit early if element is not visible', function () {
+        var $affix = $('<div style="display: none"></div>').affix()
+        $affix.data('bs.affix').checkPosition()
+        ok(!$affix.hasClass('affix'), 'affix class was not added')
+      })
+
+      test('should trigger affixed event after affix', function () {
+        stop()
+
+        var template = $('<div id="affixTarget"><ul><li>Please affix</li><li>And unaffix</li></ul></div><div id="affixAfter" style="height: 20000px; display:block;"></div>')
+        template.appendTo('body')
+
+        var affixer = $('#affixTarget').affix({
+          offset: $('#affixTarget ul').position()
+        })
+
+        $('#affixTarget')
+          .on('affix.bs.affix', function (e) {
+            ok(true, 'affix event triggered')
+          }).on('affixed.bs.affix', function (e) {
+            ok(true,'affixed event triggered')
+            $('#affixTarget').remove()
+            $('#affixAfter').remove()
+            start()
+          })
+
+        setTimeout(function () {
+          window.scrollTo(0, document.body.scrollHeight)
+          setTimeout(function () { window.scroll(0,0) }, 0)
+        },0)
+      })
+})