public void SetCurrentVersion_KeepsTheLastVersion()
{
string data = @"<config><version>1.2.3</version><last_version>3.0.1</last_version></config>";
string configFilename = Path.Combine(baseDir, "config.xml");
File.WriteAllText(configFilename, data);
structureManager.SetCurrentVersion("3.4.5");
XmlDocument doc = new XmlDocument();
doc.Load(configFilename);
var lastVersion = doc.SelectSingleNode("config/last_version");
Assert.That(lastVersion, Is.Not.Null);
Assert.That(lastVersion.InnerText, Is.EqualTo("3.0.1"));
}