package org.apidesign.test.visitor;

 import org.apidesign.test.visitor.PrintTest.PrintVisitor;

 import org.apidesign.visitor.Language.Expression;

 import org.apidesign.visitor.Language.Minus;

 import org.apidesign.visitor.Language.Number;

 import static junit.framework.Assert.*;

 import org.apidesign.visitor.Language.Visitor;

 import org.junit.Test;

 public class PrintOfMinusStructureTest {

     public static Minus newMinus(

         final Expression first, final Expression second

     ) {

         return new Minus() {

             public Expression getFirst() {

                 return first;

             }

             public Expression getSecond() {

                 return second;

             }

             public void visit(Visitor v) {

                 v.dispatchMinus(this);

             }

         };

     }

     @Test public void printOneMinusTwo() {

         Number one = PrintTest.newNumber(1);

         Number two = PrintTest.newNumber(2);

         Expression plus = newMinus(one, two);

         PrintVisitor print = new PrintVisitor();

         plus.visit(print.dispatch);

         if (Boolean.getBoolean("no.failures")) {

             assertEquals("unknown12", print.sb.toString());

             return;

         }

         assertEquals("1 - 2", print.sb.toString());

     }

 }