compoundcomparatortest.java

BOOK:Beginning Algorithms Code Examples

package com.wrox.algorithms.sorting;

import junit.framework.TestCase;

/**
 * Test cases for {@link NaturalComparator}.
 *
 */
public class CompoundComparatorTest extends TestCase {
    public void testComparisonContinuesWhileEqual() {
        CompoundComparator comparator = new CompoundComparator();
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(0));

        assertTrue(comparator.compare("IGNORED", "IGNORED") == 0);
    }

    public void testComparisonStopsWhenLessThan() {
        CompoundComparator comparator = new CompoundComparator();
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(-57));
        comparator.addComparator(new FixedComparator(91));

        assertTrue(comparator.compare("IGNORED", "IGNORED") < 0);
    }

    public void testComparisonStopsWhenGreaterThan() {
        CompoundComparator comparator = new CompoundComparator();
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(0));
        comparator.addComparator(new FixedComparator(91));
        comparator.addComparator(new FixedComparator(-57));

        assertTrue(comparator.compare("IGNORED", "IGNORED") > 0);
    }
}