Question

如何模拟CasOperations.GetImpairedNodesFromCASpectrumAsync()方法以便返回模拟值？目前，我得到一个例外（如下面的代码示例所示）。

我有以下设置：

要嘲笑的类和属性：

public class BranchCircuitStatusScheduleEntry : NWatchCustomScheduleEntryBase, INWatchCustomScheduleEntry
{
    public BranchCircuitStatusScheduleEntry(INWatchSchedulerApplication application)
        : base(application, DevOpsScheduleFrequency.Minute, 15, 0, DevOpsScheduleFlags.Always)
    {
        // Some initialization for below properties
        CasOperations = new CasOperations(cas, EntityService, IsBranchesOnly);
    }

    public CasOperations CasOperations { get; private set; }

}

public class CasOperations
{
    public CasOperations(CasApi casApi, BranchCircuitEntityService entityService, bool isBranchesOnly)
    {
        CAS = casApi;
        this.entityService = entityService;
        this.isBranchesOnly = isBranchesOnly;
    }
}

尝试执行模拟的测试：

[TestMethod]
public void DownNodeRediscoveredInSpectrum()
{
    var mock = new Mock<BranchCircuitStatusScheduleEntry>(_application);
    mock.CallBase = true;

    // Spectrum's artificial response with a model with the same name, but a "new" model handle
    var mockedNewlyImpairedNodes = new NetworkDeviceNodeStatus[]
    {
        new NetworkDeviceNodeStatus
        {
            // Not important
        }
    };

    mock.Setup(x =>
        x.CasOperations.GetImpairedNodesFromCASpectrumAsync()).ReturnsAsync(mockedNewlyImpairedNodes);
}

测试中抛出异常：

类型的例外 'Castle.DynamicProxy.InvalidProxyConstructorArgumentsException' 发生在Moq.dll但未在用户代码中处理信息：无法实例化类的代理： NWatch.NetworkCircuits.CasOperations。找不到无参数构造

Answer 1

请允许我试一试：

在模拟的设置中，您不是试图模仿BranchCircuitStatusScheduleEntry的行为，而是模拟CasOperations类的行为。所以你真的需要一个Mock<CasOperations>对象。或者甚至更好，@ {Jonesopolis Mock<ICasOperations>在他的评论中说。

此外，在BranchCircuitStatusScheduleEntry构造函数中，您正在初始化该类的实例和CasOperations的实例。如果在CasOperations构造函数之外初始化BranchCircuitStatusScheduleEntry的实例并将其作为参数传递，那会更好。

所以它会是这样的：

public class BranchCircuitStatusScheduleEntry : NWatchCustomScheduleEntryBase, INWatchCustomScheduleEntry
{
    public BranchCircuitStatusScheduleEntry(INWatchSchedulerApplication application, ICasOperations casOperations)
        : base(application, DevOpsScheduleFrequency.Minute, 15, 0, DevOpsScheduleFlags.Always)
    {
        CasOperations = casoperations;
    }

    public CasOperations CasOperations { get; private set; }
}

最后，您创建模拟，设置并将其作为参数传递给BranchCircuitStatusScheduleEntry构造函数：

var casMock = new Mock<ICasOperations>();
casMock.Setup(x => x.GetImpairedNodesFromCASpectrumAsync()).ReturnsAsync(mockedNewlyImpairedNodes);

var mock = new Mock<BranchCircuitStatusScheduleEntry>(_application, casMock.Object);
mock.CallBase = true;

请注意，BranchCircuitStatusScheduleEntry的最后一个实例可能不是模拟，而是真实对象（正在测试的实例）。

Moq - 无法模拟类属性的方法返回值

1 个答案: