AutoFixture + NSubstitute 为注入的自动模拟抛出 NotASubstituteException

Question

我收到以下异常：

NSubstitute.Exceptions.NotASubstituteException: NSubstitute extension methods like .Received() can only be called on objects created using Substitute.For() and related methods.

...调用 chargeService.When() 时：

public class WhenUserTopsUpAndStripeRejectsPaymentRequest
{
    [Theory, AutoNSubstituteData]
    public void it_should_throw_AutoTopUpFailedException(
        [Frozen] StripeChargeService chargeService,
        [Frozen] IRepository repository,
        TopUpUserAccountBalance message,
        TopUpUserAccountBalanceHandler sut) <== has dependency on StripeChargeService
    {
        repository.Find(Arg.Any<ById<User>>())
            .Returns(new User
            {
                AutoTopUpEnabled = true,
                AccountBalance = -15
            });

=====>  chargeService.When(s => s.Create(Arg.Any<StripeChargeCreateOptions>()))
            .DoNotCallBase();

        Assert.Throws<AutoTopUpFailedException>(() => sut.Handle(message));
    }
}

现在，我当然可以通过按照异常建议手动创建 StripeChargeService，然后手动创建所有依赖项并将其注入到我的 SUT 中来解决这个问题，但我宁愿使用更少的代码并让 AutoFixture完成工作。

public class AndStripeRejectsPaymentRequest
{
    [Theory, AutoNSubstituteData]
    public void it_should_throw_AutoTopUpFailedException(
        IMediator mediator,
        IBillingConfig config,
        [Frozen] IRepository repository,
        TopUpDriverAccountBalance message)
    {
        var chargeService = Substitute.ForPartsOf<StripeChargeService>("");

        repository.Find(Arg.Any<ById<Driver, TopUpDriverAccountBalanceHandler.DriverProjection>>())
            .Returns(new TopUpDriverAccountBalanceHandler.DriverProjection
            {
                AutoTopUpEnabled = true,
                AccountBalance = -15
            });

        chargeService.When(s => s.Create(Arg.Any<StripeChargeCreateOptions>()))
            .DoNotCallBase();

        // Manually build SUT, with params declared above.
        var sut = new TopUpDriverAccountBalanceHandler(mediator, repository, config, chargeService);

        Assert.Throws<AutoTopUpFailedException>(() => sut.Handle(message));
    }
}

我认为通过使用 AutoFixture.AutoNSubstitute NuGet 包中的 AutoNSubstituteCustomization()，可以使用 NSubstitute 创建自动模拟参数。我做错了什么？

Answer 1

AutoNSubstituteCustomization 仅替代抽象。如果您需要创建具体 class 的替代品，您应该使用 [Ploeh.AutoFixture.AutoNSubstitute.SubstituteAttribute] 属性显式修饰您的参数：

  [Theory, AutoNSubstituteData]
  public void it_should_throw_AutoTopUpFailedException(
      [Substitute] StripeChargeService chargeService)
  // ...

请注意（至于v3.47.3) this unfortunately does not work in combination with the [Frozen] attribute (see the corresponding AutoFixture issue）。

已更新

作为解决方法，您可以替换 AutoNSubstituteDataAttribute 中 StripeChargeService 类型的实例（或为此创建相应的 customization目的):

internal class AutoNSubstituteDataAttribute : AutoDataAttribute
{
  public AutoNSubstituteDataAttribute()
  {
    this.Fixture.Customize(new AutoNSubstituteCustomization());

    // Substitute an instance of the 'StripeChargeService' type
    this.Fixture.Customizations.Insert(
      0,
      new FilteringSpecimenBuilder(
        new MethodInvoker(new NSubstituteMethodQuery()),
        new ExactTypeSpecification(typeof(StripeChargeService))));
  }
}

AutoFixture + NSubstitute 为注入的自动模拟抛出 NotASubstituteException

AutoFixture + NSubstitute throws NotASubstituteException for injected auto mock

autofixture

nsubstitute