How to test asp.net core built-in Ilogger

Question

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<         


        

Answer 1

After some upgrades to .net core 3.1 FormattedLogValues become internal. We can not access it anymore. I made a extensions method with some changes. Some sample usage for extension method:

mockLogger.VerifyLog(Times.Once);

public static void VerifyLog(this Mock> mockLogger, Func times)
{
    mockLogger.Verify(x => x.Log(
        It.IsAny(),
        It.IsAny(),
        It.Is((v, t) => true),
        It.IsAny(),
        It.Is>((v, t) => true)), times);
}