TestWithConsoleLogger.cs

[TestMethod]
public void TestWithConsoleLogger()
{
     using var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole());
     var logger = loggerFactory.CreateLogger<CalculationService>();
     var svc = new CalculationService(logger);
     var result = svc.AddTwoPositiveNumbers(1, 2);
     Assert.AreEqual(3, result);

     // If you are using .NET Core 2.1.
     //using (var loggerFactory = new LoggerFactory().AddConsole())   // Need to use "using" in order to flush Console output
     //{
     //    var logger = loggerFactory.CreateLogger<CalculationService>();
     //    var svc = new CalculationService(logger);
     //    var result = svc.AddTwoPositiveNumbers(1, 2);
     //    Assert.AreEqual(3, result);
     //}
}