test(work): 新增验证企业微信回调通知事件的单元测试

test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/WechatWorkEventVerificationTests.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+using Xunit;
+
+namespace SKIT.FlurlHttpClient.Wechat.Work.UnitTests
+{
+    public class WechatWorkEventVerificationTests
+    {
+        [Fact(DisplayName = "验证微信服务器")]
+        public void GetEventMessageTypeTest()
+        {
+            string callbacMsgSig = "5c45ff5e21c57e6ad56bac8758b79b1d9ac89fd3";
+            string callbacTimeStamp = "1409659589";
+            string callbacNonce = "263014780";
+            string callbackEcho = "P9nAzCzyDtyTWESHep1vC5X9xho/qYX3Zpb4yKa9SKld1DsH3Iyt3tP3zNdtp+4RPcs8TgAE7OaBO+FZXvnaqQ==";
+
+            var options = new WechatWorkClientOptions()
+            {
+                CorpId = "wx5823bf96d3bd56c7",
+                PushEncodingAESKey = "jWmYm7qr5nMoAUwZRjGtBxmz3KA1tkAj3ykkR6q2B2C",
+                PushToken = "QDG6eK"
+            };
+            var client = new WechatWorkClient(options);
+
+            Assert.True(client.VerifyEventSignatureForEcho(callbacTimeStamp, callbacNonce, callbackEcho, callbacMsgSig, out string replyEcho));
+            Assert.Equal("1616140317555161061", replyEcho);
+        }
+    }
+}