ILogger.LogLevel is not enabled in C# unit tests-CodePudding

I have an extension method for Microsoft.Extensions.Logging.ILogger which checks if the given log level is enabled or not. And then proceeds with the actual logging. When I try to unit test this method, I see that logger.IsEnabled(logLevel) always returns false for all the log levels in the unit test project, causing my tests to fail.

If I remove this isEnabled check, then my unit test passes.

Even though, a default log level is set in the appsettings.json file in the actual project as well as unit test project.

The code for my extension method is:

    public static class LoggerExtensions
    {
       public static void LogErrorExt(this ILogger logger, string? message, params object?[] args)
       {
         if (logger.IsEnabled(LogLevel.Error))
         {
           logger.LogError(message, args);
         }
       }
    }

The code for my unit test class is this:

[TestClass]
public class ImprovedExtensionsTests
{
  private readonly Mock < ILogger > _logger;
  
  public ImprovedExtensionsTests()
  {
    _logger = new Mock < ILogger > ();
  }

  [TestMethod]
  public void TestOne()
  {
    _logger.Object.LogErrorExt("Testing ", 12);
    
    _logger.Verify(x => x.Log(
      LogLevel.Error,
      It.IsAny < EventId > (),
      It.IsAny < It.IsAnyType > (),
      It.IsAny < Exception > (),
      (Func < It.IsAnyType, Exception, string > ) It.IsAny < object > ()), Times.Once);
  }
}

How can I set the log levels in unit test project and make them enabled while running the tests?

CodePudding user response：

You have to create the necessary setup for your ILogger mock, e.g.:

_logger.Setup(m => m.IsEnabled(LogLevel.Error)).Returns(true);

before the call to LogErrorExt (e.g. directly after _logger = new Mock<ILogger>();).