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, 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(phoneBook);
    }

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

    }

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

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

      String actual = pb.display();

      Assert.assertEquals(expected, actual);
    }
    @Test
    public void testTwo() {
      String expected = "Dog 222-444-5555\n";
      PhoneBook pb = new PhoneBook(phoneBook);
        
      pb.add("Zebra", "111-222-3333");
      pb.add("Dog", "222-444-5555");
      pb.remove("Zebra");
        
      String actual = pb.display();

      Assert.assertEquals(expected, actual);  
    }
    @Test
    public void TestThree() {
      String expected = "222-444-5555";
      PhoneBook pb = new PhoneBook(phoneBook);
        
      pb.add("Zebra", "111-222-3333");
      pb.add("Dog", "222-444-5555");
      
      String actual = pb.lookup("Dog");
        
      Assert.assertEquals(expected, actual);
    }
    @Test
    public void TestFour() {
      String expected = "Dog";
      PhoneBook pb = new PhoneBook(phoneBook);
        
      pb.add("Zebra", "111-222-3333");
      pb.add("Dog", "222-444-5555");
      
      String actual = pb.reverseLookup("222-444-5555");
      Assert.assertEquals(expected, actual);
    }
}