package org.apidesign.test.visitor;

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

 import static junit.framework.Assert.*;

 import org.apidesign.visitor.Language.Expression;

 import org.apidesign.visitor.Language.Minus;

 import org.apidesign.visitor.Language.Number;

 import org.junit.Test;

 public class PrintOfMinusStructureTest {

     @Test public void printOneMinusTwo() {

         if (Boolean.getBoolean("no.failures")) return;

         Number one = new Number(1);

         Number two = new Number(2);

         Expression minus = new Minus(one, two);

         PrintVisitor print = new PrintVisitor();

         minus.visit(print); // fails with IllegalStateException

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

     }

 }