我目前正在为解决方案的redisprovider类编写单元测试。我的类中有一个方法在redis缓存中设置一个键：

public async Task<bool> StringSetAsync(string key, string value)
{
   var cache = multiplexer.GetDatabase();
   //Some other stuff
   result = await cache.StringSetAsync(key, value);
   return result;
}

在单元测试中，我有以下设置：

var mockMultiplexer = new Mock<IConnectionMultiplexer>();

   mockMultiplexer.Setup(_ => _.IsConnected).Returns(true);
   mockMultiplexer.Setup(_ => _.Configuration).Returns(MockedData.CacheConnectionString);

   var mockDatabase = new Mock<IDatabase>();

   mockMultiplexer
         .Setup(_ => _.GetDatabase(It.IsAny<int>(), It.IsAny<object>()))
         .Returns(() => mockDatabase.Object);

   RedisCacheProvider mockedCacheProvider = new RedisCacheProvider(new Mock<ILogger<RedisCacheProvider>> 
 ().Object, mockMultiplexer.Object);

   var result = await mockedCacheProvider.StringSetAsync(It.IsAny<string>(), It.IsAny<string>());

当我为我的单元测试运行上面的代码时，我收到的结果总是错误的。有没有办法得到真正的结果？这里怎么了？