Unittest NLog messages

TestNLogMessages.cs

using System.Linq;
using NLog;
using NLog.Targets;
using NUnit.Framework; // Using NUnit but any other unit test framework will do

namespace com.github.gist.coenm.Test
{
    public class Xyz
    {
        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        public Xyz()
        {
            Logger.Debug(() => "starting with..   aldsfkjdslfkja l    <substring> sdfkj;lkdsfja s;lkfj          ends with");
        }
    }

    public class XyzTest
    {
        private MemoryTarget logTarget;

        [SetUp]
        public void SetUp()
        {
            ReInitializeLogTarget(LogLevel.Debug);
        }

        [TearDown]
        public void TearDown()
        {
            DisposeLogTarget();
        }

        [Test]
        public void TestAbc()
        {
            //arrange

            //act
            var sut = new Xyz();

            //assert
            Assert.That(logTarget.Logs.Count, Is.EqualTo(1));
            Assert.That(logTarget.Logs.First(), Is.StringContaining("substring"));
            Assert.That(logTarget.Logs.First(), Is.StringStarting("starting with.."));
            Assert.That(logTarget.Logs.First(), Is.StringEnding("ends with"));
        }

        private void DisposeLogTarget()
        {
            if(logTarget != null)
                logTarget.Dispose();
        }

        private void ReInitializeLogTarget(LogLevel logLevel)
        {
            DisposeLogTarget();

            logTarget = new MemoryTarget { Layout = "${message}" };
            NLog.Config.SimpleConfigurator.ConfigureForTargetLogging(logTarget, logLevel);
        }
    }
}