Bootstrap/js/tests/unit/scrollspy.js

$(function () {

    module('scrollspy')

      test('should provide no conflict', function () {
        var scrollspy = $.fn.scrollspy.noConflict()
        ok(!$.fn.scrollspy, 'scrollspy was set back to undefined (org value)')
        $.fn.scrollspy = 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>' +
            '<li><a href="#masthead">Overview</a></li>' +
            '</ul>' +
            '</div>' +
            '</div>' +
            '</div>',
            $topbar = $(topbarHTML).scrollspy()

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

})