private Func<IEnumerable<ITestFile>> RewriteFunc(Func<IEnumerable<ITestFile>> filesToCopyIntoHostXapFunc)
{
string fileString = @"
<Settings>
<Port>{0}</Port>
</Settings>
".FormatWith(_webServerLocation.Port);
var settingsTestFile = new TestFile("StatLight.Settings.xml", fileString.ToByteArray());
Func<IEnumerable<ITestFile>> x = () => filesToCopyIntoHostXapFunc().Concat(new[] {settingsTestFile});
return x;
}