Bootstrap/js/tests/unit/bootstrap-scrollspy.js

$(function () {

    module("bootstrap-scrollspy")

      test("should be defined on jquery object", function () {
        ok($(document.body).scrollspy, 'scrollspy method is defined')
      })

      test("should return element", function () {
        ok($(document.body).scrollspy()[0] == document.body, 'document.body returned')
      })

      test("should switch active class on scroll", function () {
        var sectionHTML = '<div id="masthead"></div>'
          , $section = $(sectionHTML).append('#qunit-fixture')
          , topbarHTML ='<div class="topbar">'
          + '<div class="topbar-inner">'
          + '<div class="container">'
          + '<h3><a href="#">Bootstrap</a></h3>'
          + '<ul class="nav">'
          + '<li><a href="#masthead">Overview</a></li>'
          + '</ul>'
          + '</div>'
          + '</div>'
          + '</div>'
          , $topbar = $(topbarHTML).scrollspy()

        ok($topbar.find('.active', true))
      })

})