public void DataValid()
        {
            // 随机产生bytes数组
            // 写入文件作为测试数据
            byte[] bytes = RandomData.Build(2048, 512);

            // 写入文件
            const string targetPath = "WWWDownloader.Dat";
            bool         writed     = RandomData.WriteToFile(bytes, TestData.testResource_path + targetPath);

            Assert.IsTrue(writed);

            WWWDownloader fd = downloader as WWWDownloader;

            Assert.IsNotNull(fd);

            bool        runned     = false;
            IEnumerator enumerator = fd.ResourceTask(targetPath + "?" + System.Environment.TickCount.ToString(), (results, error) => {
                Assert.IsNotNull(results);
                Assert.AreEqual(bytes.Length, results.Length);
                Assert.IsTrue(string.IsNullOrEmpty(error));
                for (int i = 0; i < bytes.Length; i++)
                {
                    Assert.AreEqual(bytes [i], results [i]);
                }

                // 删除文件
                System.IO.File.Delete(TestData.testResource_path + targetPath);
                runned = true;
            });
            bool completed = enumerator.RunCoroutineWithoutYields(int.MaxValue);

            Assert.IsTrue(completed);
            Assert.IsTrue(runned);
        }
        public void ReadError()
        {
            WWWDownloader fd = downloader as WWWDownloader;

            Assert.IsNotNull(fd);

            bool        runned     = false;
            IEnumerator enumerator = fd.ResourceTask("NotExistFile.Dat", (bytes, error) => {
                Assert.IsNull(bytes);
                Assert.IsFalse(string.IsNullOrEmpty(error));
                runned = true;
            });
            bool completed = enumerator.RunCoroutineWithoutYields(int.MaxValue);

            Assert.IsTrue(completed);
            Assert.IsTrue(runned);
        }