src/test/java/org/apache/commons/lang3/compare/ComparableComparatorTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.lang3.compare;

import static org.junit.Assert.*;

import java.io.File;
import java.util.Comparator;

import org.junit.Before;
import org.junit.Test;

/**
 * <p>
 * Tests the methods in the {@link org.apache.commons.lang3.compare.ComparableComparator} class.
 * </p>
 * 
 * @version $Id: RangeTest.java 1147537 2011-07-17 06:10:37Z mbenson $
 */
public class ComparableComparatorTest {

    @Before
    public void setUp() {
    }

    //-----------------------------------------------------------------------
    @Test
    public void testUse() {
        Comparator cc = new ComparableComparator();

        // ensure same as Comparable
        assertEquals( "Not same as Integer.compareTo", new Integer(5).compareTo(2), cc.compare(5, 2) );
        assertEquals( "Not same as String.compareTo", "aardvark".compareTo("green"), cc.compare("aardvark", "green") );
        assertEquals( "Not same as File.compareTo", new File("dir/file").compareTo(new File("dir/file2")), 
                                                    cc.compare(new File("dir/file"), new File("dir/file2")) );
    }

    public void testEquals() {
        assertEquals( "Same instance wasn't equal", ComparableComparator.INSTANCE, ComparableComparator.INSTANCE);
        assertEquals( "Different instance wasn't equal", ComparableComparator.INSTANCE, new ComparableComparator());
        assertFalse( "Null was equal", ComparableComparator.INSTANCE.equals(null) );
    }

}