fix:修复已知问题

backend/IMTest/Service/UserServiceTest.cs

@@ -8,6 +8,7 @@ using IM_API.Tools;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 using Moq;
+using StackExchange.Redis;
 using System;
 using System.Threading.Tasks;
 using Xunit;
@@ -38,7 +39,8 @@ public class UserServiceTests
         var loggerMock = new Mock<ILogger<UserService>>();
         var mapper = CreateMapper();
         var mockCache = new Mock<ICacheService>();
-        return new UserService(context, loggerMock.Object, mapper , mockCache.Object);
+        var res = new Mock<IConnectionMultiplexer>();
+        return new UserService(context, loggerMock.Object, mapper , mockCache.Object, res.Object);
     }
 
     // ========== GetUserInfoAsync ==========