text: $(function () {
  
      module("collapse")
  
        test("should provide no conflict", function () {
          var collapse = $.fn.collapse.noConflict()
          ok(!$.fn.collapse, 'collapse was set back to undefined (org value)')
          $.fn.collapse = collapse
        })
  
        test("should be defined on jquery object", function () {
          ok($(document.body).collapse, 'collapse method is defined')
        })
  
        test("should return element", function () {
          ok($(document.body).collapse()[0] == document.body, 'document.body returned')
        })
  
        test("should show a collapsed element", function () {
          var el = $('<div class="collapse"></div>').collapse('show')
          ok(el.hasClass('in'), 'has class in')
          ok(/height/.test(el.attr('style')), 'has height set')
        })
  
        test("should hide a collapsed element", function () {
          var el = $('<div class="collapse"></div>').collapse('hide')
          ok(!el.hasClass('in'), 'does not have class in')
          ok(/height/.test(el.attr('style')), 'has height set')
        })
  
        test("should not fire shown when show is prevented", function () {
          $.support.transition = false
          stop()
          stop() //这里有一个bug, 下面的start方法会触发两次
          $('<div class="collapse"/>')
            .bind('show', function (e) {
              e.preventDefault();
              ok(true);
              start();
            })
            .bind('shown', function () {
              ok(false);
            })
            .collapse('show')
        })
  
        test("should reset style to auto after finishing opening collapse", function () {
          $.support.transition = false
          stop()
          $('<div class="collapse" style="height: 0px"/>')
            .bind('show', function () {
              ok(this.style.height == '0px')
            })
            .bind('shown', function () {
              ok(this.style.height == 'auto')
              start()
            })
            .collapse('show')
        })
  
        test("should add active class to target when collapse shown", function () {
          $.support.transition = false
          stop()
  
          var target = $('<a data-toggle="collapse" href="#test1"></a>')
            .appendTo($('#qunit-fixture'))
  
          var collapsible = $('<div id="test1"></div>')
            .appendTo($('#qunit-fixture'))
            .on('show', function () {
              ok(!target.hasClass('collapsed'))
              start()
            })
  
          target.click()
        })
  
        test("should remove active class to target when collapse hidden", function () {
          $.support.transition = false
          stop()
  
          var target = $('<a data-toggle="collapse" href="#test1"></a>')
            .appendTo($('#qunit-fixture'))
  
          var collapsible = $('<div id="test1" class="in"></div>')
            .appendTo($('#qunit-fixture'))
            .on('hide', function () {
              ok(target.hasClass('collapsed'))
              start()
            })
  
          target.click()
        })
  
  })
  