In-memory Serilog logger for usage in automatic tests.

Serilog.TestLogger	Serilog.TestLogger.FluentAssertions

Provides convenient way to create an instance of Serilog's ILogger that collects all the events and let's you examine them afterwards. It is designed so that you can test your logging as easy as possible.

using Serilog.TestLogger;

// Setup tests logger
var testLogger = new SerilogTestLogger();

// Spit out some log events (or not)
logger.Error("Object added {ObjectId}", 123);

// Verify logging behaviour
Assert.AreEqual(testLogger.Events.Count, 1);

Logger's Events property exposes a IList<LogEvents> so obviously having full access to the events allows you to use any kind of assertions you like.

However, you may find built-in integration with FluentAssertions very useful, especially if you already use that package for your assertions.

logger.Should().HaveNotLoggedAnyError();

logger.Should().HaveLoggedErrorContaining("MSG")
  .Which.Should().ContainPropertyWithValue("ObjectId", "123");