test(tenpayv2): 补充部分接口的单元测试用例

test/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests/TestCase_ApiExecutePayMarketingTransfersRedPackTests.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests
+{
+    public class TestCase_ApiExecutePayMarketingTransfersRedPackTests
+    {
+        [Fact(DisplayName = "测试用例：调用 API [POST] /mmpaymkttransfers/sendgroupredpack")]
+        public async Task TestCase_ApiExecuteSendPayMarketingTransfersGroupRedPackTests()
+        {
+            var request = new Models.SendPayMarketingTransfersGroupRedPackRequest()
+            {
+                ActivityName = "TEST_ACT",
+                MerchantBillNumber = "TESTMBN" + DateTimeOffset.Now.ToString("yyyyMMddHHmmssfff"),
+                AppId = TestConfigs.WechatAppId,
+                OpenId = TestConfigs.WechatOpenId,
+                SenderName = "TEST_SENDER",
+                TotalAmount = 100,
+                TotalCount = 10,
+                Wishing = "TEST_WISH",
+                ClientIp = "127.0.0.7"
+            };
+            var response = await TestClients.Instance.ExecuteSendPayMarketingTransfersGroupRedPackAsync(request);
+
+            Assert.NotNull(response.PartnerTradeNumber);
+        }
+    }
+}