Simply check logged messages in .NET Core and Moq

The Microsoft.Extensions.Logging framework in ASP.NET Core is very useful for logging, but it can be somewhat verbose to check logged messages in your unit tests. Because the methods you use for logging (LogInformation, LogWarning etc.) are all extension methods, you cannot verify calls on them. You can verify calls to the Log method. But it took me some time to find out what the exact check should be. So I wrapped that knowledge into a utility method VerifyLog, in this Gist: Happy logging!