如何使用 NSubstitute 框架验证接收到具有特殊类型的 AddSingleton

Question

我想模拟 IServiceCollection 以使用 Nsubstite 模拟库和 xUnit.[=17= 检查是否使用特定接口和具体类型调用 AddSingleton ]

这是我的单元测试：

[Fact] 
public checkIfServicesAddedTo_DI()
{
    var iServiceCollectionMock = Substitute.For<IServiceCollection>();
    var iConfiguration = Substitute.For<IConfiguration>();
    MatchServicesManager servicesManager = new MatchServicesManager();
    servicesManager.AddServices(iServiceCollectionMock, iConfiguration);

    iServiceCollectionMock.Received(1).AddSingleton(typeof(IMatchManager) , typeof(MatchManager));
}

这是实现：

public class MatchServicesManager : IServicesManager
{
    public void AddServices(IServiceCollection services, IConfiguration configuration)
    {
        services.AddSingleton<IMatchManager, MatchManager>();
    }
}

我希望测试成功，但它因以下错误而失败：

NSubstitute.Exceptions.ReceivedCallsException : Expected to receive exactly 1 call matching: Add(ServiceDescriptor) Actually received no matching calls. Received 1 non - matching call(non - matching arguments indicated with '*' characters): Add(*ServiceDescriptor *)

Answer 1

AddSingleton 是 IServiceCollection 上的扩展方法。这使得模拟或验证变得更加困难。

考虑使用接口的实际实现，然后在执行被测方法后验证预期行为。

例如

public void checkIfServicesAddedTo_DI() {
    //Arrange
    var services = new ServiceCollection();// Substitute.For<IServiceCollection>();
    var configuration = Substitute.For<IConfiguration>();
    MatchServicesManager servicesManager = new MatchServicesManager();

    //Act
    servicesManager.AddServices(services, configuration);

    //Assert (using FluentAssertions)
    services.Count.Should().Be(1);
    services[0].ServiceType.Should().Be(typeof(IMatchManager));
    services[0].ImplementationType.Should().Be(typeof(MatchManager));
}

如何使用 NSubstitute 框架验证接收到具有特殊类型的 AddSingleton

How to verify AddSingleton with special type is received using NSubstitute framework

c#

unit-testing

dependency-injection

xunit.net

nsubstitute