public void AttributeSafeWithInvalidArgumentsReturnsEmptyString()
{
var result = ExtensionMethods.AttributeSafe(null, null);
Assert.AreEqual(string.Empty, result);
var elem = CreateXml();
result = elem.AttributeSafe(null);
Assert.AreEqual(string.Empty, result);
result = elem.AttributeSafe(string.Empty);
Assert.AreEqual(string.Empty, result);
result = elem.AttributeSafe("y");
Assert.AreEqual(string.Empty, result);
}