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c# - 无法在 Nunit 中模拟 ILogger

问题描述

Net core 和 NUnit 测试用例。我的控制器如下。

public class MyController : ControllerBase
    {
      public MyController(ILogger<MyController > logger)
        {
            this.Logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }
    private readonly ILogger<MyController > Logger;

    public async Task<ActionResult> GetList()
    {
      this.Logger.LogInformation($"MyList: Some results came");
    }
 }

然后在我的单元测试用例下方。

 public class MyControllerTests
 {
   private Mock<ILogger<MyController>> Logger = new Mock<ILogger<MyController>>();
   internal MyController myController;
   public MyControllerTests()
        {
            this.myController= new MyController(this.Logger.Object);
        }
    [Test]
        public async Task ListTest()
        {
           Logger.Verify(
               x => x.Log(
                   LogLevel.Information,
                   It.IsAny<EventId>(),
                   It.Is<It.IsAnyType>((o, t) => string.Equals("MyList: Some results came", o.ToString(), StringComparison.InvariantCultureIgnoreCase)),
                   It.IsAny<Exception>(),
                   (Func<It.IsAnyType, Exception, string>)It.IsAny<object>()),
         //rest of the code but i am getting error in above line
        }
 }

上面的代码给出了错误

Moq.MockException : ILogger.Log(LogLevel.Information, 0, ListTest : 成功获取结果, null, Func<FormattedLogValues, Exception, string>) 调用失败，模拟行为严格。模拟上的所有调用都必须具有相应的设置。

有人可以帮我解决这个问题。任何帮助将不胜感激。谢谢

标签： c#asp.net-corenunitilogger

解决方案

你很亲密。这是一篇关于此的文章。这是我提出的两个工作验证：

        _logTest.Process();
        _loggerMock.Verify(l => l.Log(
            LogLevel.Information,
            It.IsAny<EventId>(),
            It.IsAny<It.IsAnyType>(),
            It.IsAny<Exception>(),
            (Func<It.IsAnyType, Exception, string>)It.IsAny<object>()), Times.Exactly(1));

此版本允许您获得更具体的信息：

        _loggerMock.Verify
        (
            l => l.Log
            (
                //Check the severity level
                LogLevel.Error,
                //This may or may not be relevant to your scenario
                It.IsAny<EventId>(),
                //This is the magical Moq code that exposes internal log processing from the extension methods
                It.Is<It.IsAnyType>((state, t) =>
                    //This confirms that the correct log message was sent to the logger. {OriginalFormat} should match the value passed to the logger
                    //Note: messages should be retrieved from a service that will probably store the strings in a resource file
                    CheckValue(state, "MyList: Some results came", "{OriginalFormat}") &&
                    //This confirms that an argument with a key of "recordId" was sent with the correct value
                    //In Application Insights, this will turn up in Custom Dimensions
                    CheckValue(state, recordId, nameof(recordId))
            ),
            //Confirm the exception type
            It.IsAny<ArgumentNullException>(),
            //Accept any valid Func here. The Func is specified by the extension methods
            (Func<It.IsAnyType, Exception, string>)It.IsAny<object>()),
            //Make sure the message was logged the correct number of times
            Times.Exactly(1)
        );

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