public void NullStringBehaviorCheck()
{
Assert.IsTrue(new LiteralString(null) == null); // !!
Assert.IsTrue(new LiteralString(null).ToString() == string.Empty); // !! => ToString() never returns null;
LiteralString s = (string)null;
Assert.IsTrue(s == null);
Assert.IsTrue(s.ToString().Length == 0); //!!
s = null; // instead of (string)null => no implicit cast operator
Assert.IsTrue(s == null);
Exception caught = null;
try{
Assert.IsTrue(s.ToString().Length == 0);
}
catch (NullReferenceException ex) {
caught = ex;
Console.WriteLine(ex.Message);
}
Assert.IsNotNull(caught);
}
