asp.net core - 为单元测试Signalr .NetCore消息传递中心模拟Context.ConnectionId

我的问题是，在对.Net CORE中的Signalr集线器进行单元测试时，获取一个context.connection ID值插入到我的方法之一中。我的方法在测试类中如下所示：

[Fact]
    public async Task TestWorkstationCreation()
    {
        Mock<IHubCallerClients<IWorkstation>> mockClients = new Mock<IHubCallerClients<IWorkstation>>();
        Mock<IWorkstation> mockClientProxy = new Mock<IWorkstation>();
        mockClients.Setup(clients => clients.All).Returns(mockClientProxy.Object);
        _workstationHub.Clients = mockClients.Object;
        await _workstationHub.RegisterWorkstation("WKS16", "Ready", new Dictionary<string, string> {{"OS", "Windows 10"}, {"Exam", "GRE, TOEFL"}});
        mockClientProxy.Verify(c => c.WorkstationRegistered(It.IsAny<WorkstationDataModel>(), It.IsAny<string>()), Times.AtLeastOnce);
    }

在我的中心类中，这是方法：

public async Task RegisterWorkstation(string id, string status, Dictionary<string, string> capabilities)
    {
        _logger.LogInformation(
            "Registering a Workstation with id: {id}, status: {status}, and capabilities: {capabilities}",
            id, status, string.Join(",", capabilities));
        var workstationAdded = AddWorkstation(id, status, capabilities, Context.ConnectionId);
        var message = workstationAdded == null
            ? $"A workstation with the id: {id} already exists!"
            : $"A workstation with the id: {id}, status: {status}, and capabilities: {string.Join(",", capabilities)} " +
              "was added to the current list of workstations available.";
        await Clients.All.WorkstationRegistered(workstationAdded, message);
    }

测试时，它会在Context.ConnectionId上抛出一个对象引用，该对象引用未设置空指针异常。是否有某种方式可以模拟可以使用的Context.Connection ID？

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