text: (function() {
    test(function() {
      var event = new AnimationEvent("");
      assert_true(event instanceof window.AnimationEvent);
    }, "the event is an instance of AnimationEvent");
  
    test(function() {
      var event = new AnimationEvent("");
      assert_true(event instanceof window.Event);
    }, "the event inherts from Event");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent();
      }, 'First argument is required, so was expecting a TypeError.');
    }, 'Missing type argument');
  
    test(function() {
      var event = new AnimationEvent("test");
      assert_equals(event.type, "test");
    }, "type argument is string");
  
    test(function() {
      var event = new AnimationEvent(null);
      assert_equals(event.type, "null");
    }, "type argument is null");
  
    test(function() {
      var event = new AnimationEvent(undefined);
      assert_equals(event.type, "undefined");
    }, "event type set to undefined");
  
    test(function() {
      var event = new AnimationEvent("test");
      assert_equals(event.animationName, "");
    }, "animationName has default value of empty string");
  
    test(function() {
      var event = new AnimationEvent("test");
      assert_equals(event.elapsedTime, 0.0);
    }, "elapsedTime has default value of 0.0");
  
    test(function() {
      var event = new AnimationEvent("test");
      assert_readonly(event, "animationName", "readonly attribute value");
    }, "animationName is readonly");
  
    test(function() {
      var event = new AnimationEvent("test");
      assert_readonly(event, "elapsedTime", "readonly attribute value");
    }, "elapsedTime is readonly");
  
    test(function() {
      var event = new AnimationEvent("test", null);
      assert_equals(event.animationName, "");
      assert_equals(event.elapsedTime, 0.0);
    }, "animationEventInit argument is null");
  
    test(function() {
      var event = new AnimationEvent("test", undefined);
      assert_equals(event.animationName, "");
      assert_equals(event.elapsedTime, 0.0);
    }, "animationEventInit argument is undefined");
  
    test(function() {
      var event = new AnimationEvent("test", {});
      assert_equals(event.animationName, "");
      assert_equals(event.elapsedTime, 0.0);
    }, "animationEventInit argument is empty dictionary");
  
    test(function() {
      var event = new AnimationEvent("test", {pseudoElement: "::testPseudo"});
      assert_equals(event.pseudoElement, "::testPseudo");
    }, "AnimationEvent.pseudoElement initialized from the dictionary");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: "sample"});
      assert_equals(event.animationName, "sample");
    }, "animationName set to 'sample'");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: undefined});
      assert_equals(event.animationName, "");
    }, "animationName set to undefined");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: null});
      assert_equals(event.animationName, "null");
    }, "animationName set to null");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: false});
      assert_equals(event.animationName, "false");
    }, "animationName set to false");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: true});
      assert_equals(event.animationName, "true");
    }, "animationName set to true");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: 0.5});
      assert_equals(event.animationName, "0.5");
    }, "animationName set to a number");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: []});
      assert_equals(event.animationName, "");
    }, "animationName set to []");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: [1, 2, 3]});
      assert_equals(event.animationName, "1,2,3");
    }, "animationName set to [1, 2, 3]");
  
    test(function() {
      var event = new AnimationEvent("test", {animationName: {sample: 0.5}});
      assert_equals(event.animationName, "[object Object]");
    }, "animationName set to an object");
  
    test(function() {
      var event = new AnimationEvent("test",
          {animationName: {valueOf: function () { return 'sample'; }}});
      assert_equals(event.animationName, "[object Object]");
    }, "animationName set to an object with a valueOf function");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: 0.5});
      assert_equals(event.elapsedTime, 0.5);
    }, "elapsedTime set to 0.5");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: -0.5});
      assert_equals(event.elapsedTime, -0.5);
    }, "elapsedTime set to -0.5");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: undefined});
      assert_equals(event.elapsedTime, 0);
    }, "elapsedTime set to undefined");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: null});
      assert_equals(event.elapsedTime, 0);
    }, "elapsedTime set to null");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: false});
      assert_equals(event.elapsedTime, 0);
    }, "elapsedTime set to false");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: true});
      assert_equals(event.elapsedTime, 1);
    }, "elapsedTime set to true");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: ""});
      assert_equals(event.elapsedTime, 0);
    }, "elapsedTime set to ''");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: []});
      assert_equals(event.elapsedTime, 0);
    }, "elapsedTime set to []");
  
    test(function() {
      var event = new AnimationEvent("test", {elapsedTime: [0.5]});
      assert_equals(event.elapsedTime, 0.5);
    }, "elapsedTime set to [0.5]");
  
    test(function() {
      var event = new AnimationEvent(
          "test", {elapsedTime: { valueOf: function() { return 0.5; }}});
      assert_equals(event.elapsedTime, 0.5);
    }, "elapsedTime set to an object with a valueOf function");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: NaN});
      }, 'elapsedTime cannot be NaN so was expecting a TypeError');
    }, "elapsedTime cannot be set to NaN");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: Infinity});
      }, 'elapsedTime cannot be Infinity so was expecting a TypeError');
    }, "elapsedTime cannot be set to Infinity");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: -Infinity});
      }, 'elapsedTime cannot be -Infinity so was expecting a TypeError');
    }, "elapsedTime cannot be set to -Infinity");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: "sample"});
      }, 'elapsedTime cannot be a string so was expecting a TypeError');
    }, "elapsedTime cannot be set to 'sample'");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: [0.5, 1.0]});
      }, 'elapsedTime cannot be a multi-element array so was expecting a TypeError');
    }, "elapsedTime cannot be set to [0.5, 1.0]");
  
    test(function() {
      assert_throws(new TypeError(), function() {
        new AnimationEvent("test", {elapsedTime: { sample: 0.5}});
      }, 'elapsedTime cannot be an object so was expecting a TypeError');
    }, "elapsedTime cannot be set to an object");
  
    test(function() {
      var eventInit = {animationName: "sample", elapsedTime: 0.5};
      var event = new AnimationEvent("test", eventInit);
      assert_equals(event.animationName, "sample");
      assert_equals(event.elapsedTime, 0.5);
    }, "AnimationEventInit properties set value");
  })();
  