當我在測驗中設定IMediatorMock時回傳null

這是我的代碼：

public sealed class BulkAddStockConditionItemCommandHandler : IRequestHandler<BulkAddStockConditionItemCommand,
    UserStockConditionSetsEntity>
{

    private readonly IMediator _mediator;


    public BulkAddStockConditionItemCommandHandler(IMediator mediator)
    {

        _mediator = mediator;
  
    }

    public async Task<UserStockConditionSetsEntity> Handle(BulkAddStockConditionItemCommand request,
        CancellationToken cancellationToken)
    {
        var conditionalRiskAgreements = new ConditionalRiskAgreementEntity(_userService.CustomerIsin);

        var addRes = await _mediator.Send(new AcceptConditionalRiskAgreementCommand(), cancellationToken);

        if (addRes == null) throw new Exception();


        //...code removed for brevity
    }
}

我將它注入IMediator到我的建構式中，我不需要addRes在NULL我的單元測驗場景中，所以在這里你可以看到我的測驗場景：

public async void BulkAddStockConditionItemCommand_when_StockConditionSet_is_null()
{
    //arrange
    
    var condition = new ConditionalRiskAgreementEntity(RandomIsin);

    var mediator = new Mock<IMediator>();

    mediator.Setup(i => i.Send(It.IsAny<ConditionalRiskAgreementEntity>(), It.IsAny<System.Threading.CancellationToken>())).ReturnsAsync(Task.FromResult<object>(condition));

    BulkAddStockConditionItemCommand command = new BulkAddStockConditionItemCommand(data);
    BulkAddStockConditionItemCommandHandler handler = new BulkAddStockConditionItemCommandHandler(mediator.Object, userservice.Object, repoacc.Object, CacheableRepository.Object);

    //Act

    var caughtException = await Assert.ThrowsAsync<Exception>(() => handler.Handle(command, new System.Threading.CancellationToken()));

    //Assert
    Assert.IsType<Exception>(caughtException);

}

我設定了IMediatoras 但是當我運行測驗時它回傳null而不是condition 變數。為什么？

uj5u.com熱心網友回復：

根據顯示的代碼，被測物件使用 AcceptConditionalRiskAgreementCommand

//...

var addRes = await _mediator.Send(new AcceptConditionalRiskAgreementCommand(), cancellationToken);

//...

但在測驗中，模擬調解器設定為期望 ConditionalRiskAgreementEntity

//...

mediator.Setup(i => i.Send(It.IsAny<ConditionalRiskAgreementEntity>(), It.IsAny<System.Threading.CancellationToken>()))
    .ReturnsAsync(Task.FromResult<object>(condition));

//...

當引數匹配器在呼叫的成員中不匹配時，模擬將默認回傳null 。

無需回傳Task.FromResult<object>(condition)，ReturnsAsync因為它會將您傳入的任何內容都包裹起來Task

首先，我建議您重構要使用的測驗async Task，async void然后更新模擬以期望在被測主題中使用的實際引數型別。

public async Task BulkAddStockConditionItemCommand_when_StockConditionSet_is_null() {
    //Arrange
    var condition = new ConditionalRiskAgreementEntity(RandomIsin);

    var mediator = new Mock<IMediator>();

    mediator
        .Setup(i => i.Send(It.IsAny<AcceptConditionalRiskAgreementCommand>(), It.IsAny<System.Threading.CancellationToken>()))
        .ReturnsAsync(condition);

    BulkAddStockConditionItemCommand command = new BulkAddStockConditionItemCommand(data);
    BulkAddStockConditionItemCommandHandler handler = new BulkAddStockConditionItemCommandHandler(mediator.Object, userservice.Object, repoacc.Object, CacheableRepository.Object);

    //Act
    var caughtException = await Assert.ThrowsAsync<Exception>(() => handler.Handle(command, new System.Threading.CancellationToken()));

    //Assert
    Assert.IsType<Exception>(caughtException);
}

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