如何测试asp.net核心的内置Ilogger [英] How to test asp.net core built-in Ilogger

问题描述

我想验证一些日志记录.我正在使用asp.net核心内置的ILogger，并使用asp.net核心内置的DI注入它:

I want to verify some logs logged. I am using the asp.net core built-in ILogger, and inject it with the asp.net core built-in DI:

private readonly ILogger<InvoiceApi> _logger;

public InvoiceApi(ILogger<InvoiceApi> logger)
{
    _logger = logger;
}

然后我将其用作:_logger.LogError("error));

我尝试通过以下方式照常(用最小起订量)模拟它:

I tried to mock it (with moq) as usual by:

MockLogger = new Mock<ILogger<InvoiceApi>>();

并将其注入服务以通过以下方式进行测试:

and inject this in the service for test by:

new InvoiceApi(MockLogger.Object);

然后尝试验证:

MockLogger.Verify(m => m.LogError(It.Is<string>(s => s.Contains("CreateInvoiceFailed"))));

但它抛出:

对非虚拟成员(在VB中可重写)的无效验证:m => m.LogError

Invalid verify on a non-virtual (overridable in VB) member: m => m.LogError

那么，如何验证此日志已记录?

So, how can I verify this logs logged?

推荐答案

正如@Nkosi所说，您不能模拟扩展方法.您应该模拟的是 ILogger.Log方法，该方法

As @Nkosi've already said, you can't mock an extension method. What you should mock, is the ILogger.Log method, which LogError calls into. It makes the verification code a bit clunky, but it should work:

MockLogger.Verify(
    m => m.Log(
        LogLevel.Error,
        It.IsAny<EventId>(),
        It.Is<FormattedLogValues>(v => v.ToString().Contains("CreateInvoiceFailed")),
        It.IsAny<Exception>(),
        It.IsAny<Func<object, Exception, string>>()
    )
);

(不确定是否可以编译，但是要点)

(Not sure if this compiles, but you get the gist)

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