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

I have to do a fair bit of logger verification for black box processes at work and, after putting up with the expressions for a short period, I caved and put together an expression builder - Moq.Contrib.ExpressionBuilders.Logging.

The end result is a shorter, fluent, verification statement:

logger.Verify(
  Log.With.LogLevel(LogLevel.Error)
    .And.EventId(666)
    .And.LogMessage("I am a meat popsicle"), 
  Times.Once);