public void ParseSymbol()
{
ModelParser parser = new ModelParser("#foo");
IExpression expression = parser.ParseExpression();
Assert.IsNotNull(expression);
Assert.IsInstanceOfType(expression, typeof(SymbolExpression));
SymbolExpression sexpression = (SymbolExpression)expression;
Assert.AreEqual("foo", sexpression.Symbol);
Assert.AreEqual("#foo", expression.AsString());
}