How to unit test with ILogger in ASP.NET Core

Question

This is my controller:

public class BlogController : Controller
{
    private IDAO _blogDAO;
    private readonly ILogger _         


        

Answer 1

For .net core 3 answers that are using Moq

• https://stackoverflow.com/a/54646657/2164198
• https://stackoverflow.com/a/54809607/2164198

• https://stackoverflow.com/a/56728528/2164198

  are no longer working due to a change described in the issue TState in ILogger.Log used to be object, now FormattedLogValues

Luckily stakx provided a nice workaround. So I'm posting it in hope it can save time for others (it took a while to figure the things out):

 loggerMock.Verify(
                x => x.Log(
                    LogLevel.Information,
                    It.IsAny(),
                    It.Is((o, t) => string.Equals("Index page say hello", o.ToString(), StringComparison.InvariantCultureIgnoreCase)),
                    It.IsAny(),
                    (Func) It.IsAny