public void SetUp()
{
XmlDocument xmlDoc = new XmlDocument();
XmlElement log4NetNode = xmlDoc.CreateElement(Log4NetXmlConstants.Log4Net);
IElementConfiguration configuration = Substitute.For <IElementConfiguration>();
configuration.ConfigXml.Returns(xmlDoc);
configuration.Log4NetNode.Returns(log4NetNode);
mSut = new MemoryAppender(configuration);
mSut.Initialize();
}