public void EvaluateDelayedCallExpression()
{
Context context = new Context();
Function function = new Function(context, new object[] { new Variable("X"), new Variable("Y") }, new AddExpression(new VariableExpression(new Variable("X")), new VariableExpression(new Variable("Y"))));
context.SetValue("add/2", function);
DelayedCallExpression expr = new DelayedCallExpression(new AtomExpression(new Atom("add")), new IExpression[] { new ConstantExpression(1), new ConstantExpression(2) });
Assert.IsFalse(expr.HasVariable());
Assert.IsNotNull(expr.NameExpression);
Assert.IsInstanceOfType(expr.NameExpression, typeof(AtomExpression));
Assert.IsNotNull(expr.ArgumentExpressions);
Assert.AreEqual(2, expr.ArgumentExpressions.Count);
var result = expr.Evaluate(context);
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(DelayedCall));
Assert.AreEqual(3, ((DelayedCall)result).Evaluate());
}