ZCW-PhoneBook/PhoneBookTest.java

import org.junit.Assert;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.*;

/**
 * The test class PhoneBookTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class PhoneBookTest
{

    TreeMap<String, ArrayList<String>> phoneBook = new TreeMap<>();
    /**
     * Default constructor for test class PhoneBookTest
     */
    public PhoneBookTest()
    {
    }

    /**
     * Sets up the test fixture.
     *
     * Called before every test case method.
     */
    @Before
    public void setUp()
    {
        PhoneBook pb = new PhoneBook();
    }

    /**
     * Tears down the test fixture.
     *
     * Called after every test case method.
     */
    @After
    public void tearDown()
    {

    }

    // add entries
    @Test
    public void testAdd() { 
        String expected = "Zebra 111-222-3333 222-444-5555\n";

        PhoneBook pb = new PhoneBook();
        pb.add("Zebra", "111-222-3333");
        pb.add("Zebra", "222-444-5555");

        String actual = pb.display();

        Assert.assertEquals(expected, actual);
    }

    @Test
    public void testRemove() {
        String expected = "Zebra 222-444-5555\n";
        PhoneBook pb = new PhoneBook(phoneBook);

        pb.add("Zebra", "111-222-3333");
        pb.add("Zebra", "222-444-5555");
        pb.remove("Zebra", "111-222-3333");

        String actual = pb.display();

        Assert.assertEquals(expected, actual);  
    }

    @Test
    public void testRemoveRecord() {
        String expected = "Zebra 222-444-5555\n";
        PhoneBook pb = new PhoneBook(phoneBook);

        pb.add("Dog", "111-222-3333");
        pb.add("Dog", "333-444-5555");
        pb.add("Zebra", "222-444-5555");
        pb.removeRecord("Dog");

        String actual = pb.display();

        Assert.assertEquals(expected, actual);  
    }

    @Test
    public void testLookup() {

        ArrayList<String> expected = new ArrayList<>();
        expected.add("111-222-3333");
        expected.add("222-444-5555");
        PhoneBook pb = new PhoneBook(phoneBook);

        pb.add("Zebra", "111-222-3333");
        pb.add("Zebra", "222-444-5555");

        ArrayList<String> actual = pb.lookup("Zebra");
        Assert.assertEquals(expected, actual);  
    }

    @Test
    public void testReverseLookup() {

        String expected = "Zebra";    
        PhoneBook pb = new PhoneBook(phoneBook);

        pb.add("Zebra", "111-222-3333");
        pb.add("Zebra", "222-444-5555");

        String actual = pb.reverseLookup("222-444-5555");
        Assert.assertEquals(expected, actual);  
    }
}