public void SendMessage()
{
Context context = new Context();
Process process = new Process();
context.SetValue("X", process);
SendExpression expr = new SendExpression(new VariableExpression(new Variable("X")), new ConstantExpression(1));
Assert.IsNotNull(expr.ProcessExpression);
Assert.IsInstanceOfType(expr.ProcessExpression, typeof(VariableExpression));
Assert.IsNotNull(expr.MessageExpression);
Assert.IsInstanceOfType(expr.MessageExpression, typeof(ConstantExpression));
Assert.IsTrue(expr.HasVariable());
Assert.AreEqual(1, expr.Evaluate(context));
Assert.AreEqual(1, process.GetMessage());
}