模拟 Context.ConnectionId 以进行单元测试 Signalr .NetCore 消息中心

Question

我的问题是，当我在 .Net CORE 中对 Signalr 集线器进行单元测试时，获取 context.connection ID 值插入我的方法之一。我的方法在我的测试类中如下所示：

    [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);
    }

在我的集线器类中，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，在Context.ConnectionId处抛出Object引用未设置空指针异常。有什么办法可以模拟可以使用的 Context.Connection Id 吗？

Answer 1

我最终在单元测试中这样做了并且它有效

        [Fact]
        public async Task TestWorkstationCreation()
        {
            Mock<IHubCallerClients<IWorkstation>> mockClients = new Mock<IHubCallerClients<IWorkstation>>();
            Mock<IWorkstation> mockClientProxy = new Mock<IWorkstation>();
            Mock<HubCallerContext> mockClientContext = new Mock<HubCallerContext>();
            mockClients.Setup(clients => clients.All).Returns(mockClientProxy.Object);
            mockClientContext.Setup(c => c.ConnectionId).Returns(Guid.NewGuid().ToString);
            _workstationHub.Clients = mockClients.Object;
            _workstationHub.Context = mockClientContext.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);
        }