public void AddOrUpdateTest( )
{
var variables = new { x = 5, y = 10 };
var st = new SymbolTable();
st.AddOrUpdate(variables);
Assert.IsNotNull(st.Get("x"));
Assert.IsNotNull(st.Get("y"));
Assert.AreEqual(5, (st.Get("x") as VariableSymbolTableEntry).Value);
Assert.AreEqual(10, (st.Get("y") as VariableSymbolTableEntry).Value);
}