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diff --git a/bootstrap/js/tests/unit/scrollspy.js b/bootstrap/js/tests/unit/scrollspy.js
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+$(function () {
+  'use strict';
+
+  QUnit.module('scrollspy plugin')
+
+  QUnit.test('should be defined on jquery object', function (assert) {
+    assert.expect(1)
+    assert.ok($(document.body).scrollspy, 'scrollspy method is defined')
+  })
+
+  QUnit.module('scrollspy', {
+    beforeEach: function () {
+      // Run all tests in noConflict mode -- it's the only way to ensure that the plugin works in noConflict mode
+      $.fn.bootstrapScrollspy = $.fn.scrollspy.noConflict()
+    },
+    afterEach: function () {
+      $.fn.scrollspy = $.fn.bootstrapScrollspy
+      delete $.fn.bootstrapScrollspy
+    }
+  })
+
+  QUnit.test('should provide no conflict', function (assert) {
+    assert.expect(1)
+    assert.strictEqual($.fn.scrollspy, undefined, 'scrollspy was set back to undefined (org value)')
+  })
+
+  QUnit.test('should return jquery collection containing the element', function (assert) {
+    assert.expect(2)
+    var $el = $('<div/>')
+    var $scrollspy = $el.bootstrapScrollspy()
+    assert.ok($scrollspy instanceof $, 'returns jquery collection')
+    assert.strictEqual($scrollspy[0], $el[0], 'collection contains element')
+  })
+
+  QUnit.test('should only switch "active" class on current target', function (assert) {
+    assert.expect(1)
+    var done = assert.async()
+
+    var sectionHTML = '<div id="root" class="active">'
+        + '<div class="topbar">'
+        + '<div class="topbar-inner">'
+        + '<div class="container" id="ss-target">'
+        + '<ul class="nav">'
+        + '<li><a href="#masthead">Overview</a></li>'
+        + '<li><a href="#detail">Detail</a></li>'
+        + '</ul>'
+        + '</div>'
+        + '</div>'
+        + '</div>'
+        + '<div id="scrollspy-example" style="height: 100px; overflow: auto;">'
+        + '<div style="height: 200px;">'
+        + '<h4 id="masthead">Overview</h4>'
+        + '<p style="height: 200px">'
+        + 'Ad leggings keytar, brunch id art party dolor labore.'
+        + '</p>'
+        + '</div>'
+        + '<div style="height: 200px;">'
+        + '<h4 id="detail">Detail</h4>'
+        + '<p style="height: 200px">'
+        + 'Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard.'
+        + '</p>'
+        + '</div>'
+        + '</div>'
+        + '</div>'
+    var $section = $(sectionHTML).appendTo('#qunit-fixture')
+
+    var $scrollspy = $section
+      .show()
+      .find('#scrollspy-example')
+      .bootstrapScrollspy({ target: '#ss-target' })
+
+    $scrollspy.on('scroll.bs.scrollspy', function () {
+      assert.ok($section.hasClass('active'), '"active" class still on root node')
+      done()
+    })
+
+    $scrollspy.scrollTop(350)
+  })
+
+  QUnit.test('should correctly select middle navigation option when large offset is used', function (assert) {
+    assert.expect(3)
+    var done = assert.async()
+
+    var sectionHTML = '<div id="header" style="height: 500px;"></div>'
+        + '<nav id="navigation" class="navbar">'
+        + '<ul class="nav navbar-nav">'
+        + '<li class="active"><a id="one-link" href="#one">One</a></li>'
+        + '<li><a id="two-link" href="#two">Two</a></li>'
+        + '<li><a id="three-link" href="#three">Three</a></li>'
+        + '</ul>'
+        + '</nav>'
+        + '<div id="content" style="height: 200px; overflow-y: auto;">'
+        + '<div id="one" style="height: 500px;"></div>'
+        + '<div id="two" style="height: 300px;"></div>'
+        + '<div id="three" style="height: 10px;"></div>'
+        + '</div>'
+    var $section = $(sectionHTML).appendTo('#qunit-fixture')
+    var $scrollspy = $section
+      .show()
+      .filter('#content')
+
+    $scrollspy.bootstrapScrollspy({ target: '#navigation', offset: $scrollspy.position().top })
+
+    $scrollspy.on('scroll.bs.scrollspy', function () {
+      assert.ok(!$section.find('#one-link').parent().hasClass('active'), '"active" class removed from first section')
+      assert.ok($section.find('#two-link').parent().hasClass('active'), '"active" class on middle section')
+      assert.ok(!$section.find('#three-link').parent().hasClass('active'), '"active" class not on last section')
+      done()
+    })
+
+    $scrollspy.scrollTop(550)
+  })
+
+  QUnit.test('should add the active class to the correct element', function (assert) {
+    assert.expect(2)
+    var navbarHtml =
+        '<nav class="navbar">'
+      + '<ul class="nav">'
+      + '<li id="li-1"><a href="#div-1">div 1</a></li>'
+      + '<li id="li-2"><a href="#div-2">div 2</a></li>'
+      + '</ul>'
+      + '</nav>'
+    var contentHtml =
+        '<div class="content" style="overflow: auto; height: 50px">'
+      + '<div id="div-1" style="height: 100px; padding: 0; margin: 0">div 1</div>'
+      + '<div id="div-2" style="height: 200px; padding: 0; margin: 0">div 2</div>'
+      + '</div>'
+
+    $(navbarHtml).appendTo('#qunit-fixture')
+    var $content = $(contentHtml)
+      .appendTo('#qunit-fixture')
+      .bootstrapScrollspy({ offset: 0, target: '.navbar' })
+
+    var done = assert.async()
+    var testElementIsActiveAfterScroll = function (element, target) {
+      var deferred = $.Deferred()
+      var scrollHeight = Math.ceil($content.scrollTop() + $(target).position().top)
+      $content.one('scroll', function () {
+        assert.ok($(element).hasClass('active'), 'target:' + target + ', element' + element)
+        deferred.resolve()
+      })
+      $content.scrollTop(scrollHeight)
+      return deferred.promise()
+    }
+
+    $.when(testElementIsActiveAfterScroll('#li-1', '#div-1'))
+      .then(function () { return testElementIsActiveAfterScroll('#li-2', '#div-2') })
+      .then(function () { done() })
+  })
+
+  QUnit.test('should add the active class correctly when there are nested elements at 0 scroll offset', function (assert) {
+    assert.expect(6)
+    var times = 0
+    var done = assert.async()
+    var navbarHtml = '<nav id="navigation" class="navbar">'
+      + '<ul class="nav">'
+      + '<li id="li-1"><a href="#div-1">div 1</a>'
+      + '<ul>'
+      + '<li id="li-2"><a href="#div-2">div 2</a></li>'
+      + '</ul>'
+      + '</li>'
+      + '</ul>'
+      + '</nav>'
+
+    var contentHtml = '<div class="content" style="position: absolute; top: 0px; overflow: auto; height: 50px">'
+      + '<div id="div-1" style="padding: 0; margin: 0">'
+      + '<div id="div-2" style="height: 200px; padding: 0; margin: 0">div 2</div>'
+      + '</div>'
+      + '</div>'
+
+    $(navbarHtml).appendTo('#qunit-fixture')
+
+    var $content = $(contentHtml)
+      .appendTo('#qunit-fixture')
+      .bootstrapScrollspy({ offset: 0, target: '#navigation' })
+
+    !function testActiveElements() {
+      if (++times > 3) return done()
+
+      $content.one('scroll', function () {
+        assert.ok($('#li-1').hasClass('active'), 'nav item for outer element has "active" class')
+        assert.ok($('#li-2').hasClass('active'), 'nav item for inner element has "active" class')
+        testActiveElements()
+      })
+
+      $content.scrollTop($content.scrollTop() + 10)
+    }()
+  })
+
+  QUnit.test('should clear selection if above the first section', function (assert) {
+    assert.expect(3)
+    var done = assert.async()
+
+    var sectionHTML = '<div id="header" style="height: 500px;"></div>'
+        + '<nav id="navigation" class="navbar">'
+        + '<ul class="nav navbar-nav">'
+        + '<li class="active"><a id="one-link" href="#one">One</a></li>'
+        + '<li><a id="two-link" href="#two">Two</a></li>'
+        + '<li><a id="three-link" href="#three">Three</a></li>'
+        + '</ul>'
+        + '</nav>'
+    $(sectionHTML).appendTo('#qunit-fixture')
+
+    var scrollspyHTML = '<div id="content" style="height: 200px; overflow-y: auto;">'
+        + '<div id="spacer" style="height: 100px;"/>'
+        + '<div id="one" style="height: 100px;"/>'
+        + '<div id="two" style="height: 100px;"/>'
+        + '<div id="three" style="height: 100px;"/>'
+        + '<div id="spacer" style="height: 100px;"/>'
+        + '</div>'
+    var $scrollspy = $(scrollspyHTML).appendTo('#qunit-fixture')
+
+    $scrollspy
+      .bootstrapScrollspy({
+        target: '#navigation',
+        offset: $scrollspy.position().top
+      })
+      .one('scroll.bs.scrollspy', function () {
+        assert.strictEqual($('.active').length, 1, '"active" class on only one element present')
+        assert.strictEqual($('.active').has('#two-link').length, 1, '"active" class on second section')
+
+        $scrollspy
+          .one('scroll.bs.scrollspy', function () {
+            assert.strictEqual($('.active').length, 0, 'selection cleared')
+            done()
+          })
+          .scrollTop(0)
+      })
+      .scrollTop(201)
+  })
+
+  QUnit.test('should correctly select navigation element on backward scrolling when each target section height is 100%', function (assert) {
+    assert.expect(5)
+    var navbarHtml =
+        '<nav class="navbar">'
+      + '<ul class="nav">'
+      + '<li id="li-100-1"><a href="#div-100-1">div 1</a></li>'
+      + '<li id="li-100-2"><a href="#div-100-2">div 2</a></li>'
+      + '<li id="li-100-3"><a href="#div-100-3">div 3</a></li>'
+      + '<li id="li-100-4"><a href="#div-100-4">div 4</a></li>'
+      + '<li id="li-100-5"><a href="#div-100-5">div 5</a></li>'
+      + '</ul>'
+      + '</nav>'
+    var contentHtml =
+        '<div class="content" style="position: relative; overflow: auto; height: 100px">'
+      + '<div id="div-100-1" style="position: relative; height: 100%; padding: 0; margin: 0">div 1</div>'
+      + '<div id="div-100-2" style="position: relative; height: 100%; padding: 0; margin: 0">div 2</div>'
+      + '<div id="div-100-3" style="position: relative; height: 100%; padding: 0; margin: 0">div 3</div>'
+      + '<div id="div-100-4" style="position: relative; height: 100%; padding: 0; margin: 0">div 4</div>'
+      + '<div id="div-100-5" style="position: relative; height: 100%; padding: 0; margin: 0">div 5</div>'
+      + '</div>'
+
+    $(navbarHtml).appendTo('#qunit-fixture')
+    var $content = $(contentHtml)
+      .appendTo('#qunit-fixture')
+      .bootstrapScrollspy({ offset: 0, target: '.navbar' })
+
+    var testElementIsActiveAfterScroll = function (element, target) {
+      var deferred = $.Deferred()
+      var scrollHeight = Math.ceil($content.scrollTop() + $(target).position().top)
+      $content.one('scroll', function () {
+        assert.ok($(element).hasClass('active'), 'target:' + target + ', element: ' + element)
+        deferred.resolve()
+      })
+      $content.scrollTop(scrollHeight)
+      return deferred.promise()
+    }
+
+    var done = assert.async()
+    $.when(testElementIsActiveAfterScroll('#li-100-5', '#div-100-5'))
+      .then(function () { return testElementIsActiveAfterScroll('#li-100-4', '#div-100-4') })
+      .then(function () { return testElementIsActiveAfterScroll('#li-100-3', '#div-100-3') })
+      .then(function () { return testElementIsActiveAfterScroll('#li-100-2', '#div-100-2') })
+      .then(function () { return testElementIsActiveAfterScroll('#li-100-1', '#div-100-1') })
+      .then(function () { done() })
+  })
+
+})