public async Task ListOneGroupInfoAsync_Test()
        {
            var mockExecuter       = new Mock <IExecuter>();
            var mockClusterFactory = new Mock <IClusterFactory>();

            mockExecuter.Setup(x => x.Execute(It.IsAny <FastDFSReq <ListOneGroupResp> >(), It.IsAny <string>(), It.IsAny <ConnectionAddress>())).ReturnsAsync(new ListOneGroupResp()
            {
                GroupInfo = new GroupInfo()
                {
                    GroupName = "group2"
                }
            });

            IFastDFSClient client    = new FastDFSClient(mockExecuter.Object, mockClusterFactory.Object);
            var            groupInfo = await client.ListOneGroupInfoAsync("group1");

            Assert.Equal("group2", groupInfo.GroupName);

            mockExecuter.Verify(x => x.Execute(It.IsAny <FastDFSReq <ListOneGroupResp> >(), It.IsAny <string>(), It.IsAny <ConnectionAddress>()), Times.Once);
        }