package org.apidesign.test.visitor;

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.apidesign.visitor.Language.Plus;

import org.junit.Test;

public class InvalidCountNumbersTest {

    @Test public void printOneMinusTwo() {

        // BEGIN: visitor.visitunknown.traversal

        Number one = new Number(1);

        Number three = new Number(3);

        Number four = new Number(4);

        Expression minus = new Plus(one, new Minus(three, four));

        int cnt = CountNumbersTest.countNumbers(minus);

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

            // Should have three numbers, but visitor does not

            // know how to go through minus

            assertEquals(

                "Wrong result as there is no traversal through minus", 1, cnt

            );

            return;

        }

        assertEquals(

            "Should have three numbers, but visitor does not " +

            "know how to go through minus", 3, cnt

        );

        // END: visitor.visitunknown.traversal

    }

}