起订量回调不会调用我设置的起订量答案

【问题标题】：Moq Callback does not invoke moq that I've setup起订量回调不会调用我设置的起订量
【发布时间】：2018-12-02 21:11:51
【问题描述】：

我的模拟类和方法：

public class EmailService: IEmailService
{
    private readonly ISendGridClient _client;

    public EmailService(ISendGridClient client)
    {
        _client = client;
    }

    public async Task SendAsync(string email, string senderAderess, string senderName, string recipientName, string subject, string content, string htmlContent)
    {
        var from = new EmailAddress(senderAderess, senderName);
        var to = new EmailAddress(email, recipientName);
        var plainContent = content;
        var msg = MailHelper.CreateSingleEmail(from, to, subject, plainContent, htmlContent);

        await _client.SendEmailAsync(msg);
    }
}

并对其进行单元测试

public async void EmailService_SendingEmail_EmailSentSuccessfullyAsync()
{
    var test = 0;

    var mockEmailClient = new Mock<ISendGridClient>();

    mockEmailClient.Setup(x => x.SendEmailAsync(new SendGridMessage(), CancellationToken.None)).Callback(() => test++);

    var emailSender = new EmailService(mockEmailClient.Object);

    await emailSender.SendAsync("mail@gmail.com", "SenderDemo", "Ilya", "EmailServiceUnitTest", "Demo", "Test",
            "<strong>Hello</strong>");

    Assert.Equal(1, test);
}

问题是我的 mock 没有提升我的回调方法

可能是由于模拟方法的异步性质造成的问题，但我真的需要你的帮助:)

【问题讨论】：

请添加ISendGridClient的方法

标签： c# .net unit-testing moq

【解决方案1】：

你在嘲笑

SendEmailAsync(new SendGridMessage(), CancellationToken.None)

但是打电话

_client.SendEmailAsync(msg)

那么哪一个是正确的？你也不需要这个test 变量。只需使用

 mockEmailClient.Verify(x => x.SendEmailAsync(...), Times.Once)

你实际上可以这样写：

   public async Task EmailService_SendingEmail_EmailSentSuccessfullyAsync()
    {
        var mockEmailClient = new Mock<ISendGridClient>();

        mockEmailClient.Setup(x => x.SendEmailAsync(It.IsAny<YourMessageType>()));

        var emailSender = new EmailService(mockEmailClient.Object);

        await emailSender.SendAsync("mail@gmail.com", "SenderDemo", "Ilya", "EmailServiceUnitTest", "Demo", "Test",
            "<strong>Hello</strong>");

        mockEmailClient.Verify(x => x.SendEmailAsync(It.IsAny<YourMessageType>()), Times.Once);
    }

【讨论】：

我只需要没有 CancellationToken 的“msg”
谢谢！是的，还需要替换注入了模拟服务的服务......

【解决方案2】：

模拟的客户端需要返回一个完整的Task 以允许异步流继续。

这将允许在执行测试时调用回调。

public async Task EmailService_SendingEmail_EmailSentSuccessfullyAsync() {
    //Arrange
    var test = 0;

    var mockEmailClient = new Mock<ISendGridClient>();

    mockEmailClient
        .Setup(x => x.SendEmailAsync(It.IsAny<SendGridMessage>(), It.IsAny<CancellationToken>()))
        .Returns(Task.FromResult((object)null)) //<-- needed to allow async flow to continue
        .Callback(() => test++);

    var emailSender = new EmailService(mockEmailClient.Object);

    //Act    
    await emailSender.SendAsync("mail@gmail.com", "SenderDemo", "Ilya", "EmailServiceUnitTest", "Demo", "Test",
            "<strong>Hello</strong>");

    //Assert    
    Assert.Equal(1, test);
}

还要注意测试的变化和设置模拟时使用的参数匹配器

【讨论】：