ZCW-PhoneBook/PhoneBookTest.java

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

/**
 * The test class PhoneBookTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class PhoneBookTest
{
    @Test
    public void testAdd(){
        //given
        PhoneBook phoneBook = new PhoneBook();

        //actual
        phoneBook.add("eric", "3025884804");
        String actual = phoneBook.lookup("eric");

        //expected
        String expected = "3025884804";

        //test
        assertEquals(expected, actual);
    }

    @Test
    public void testAddMultiple(){
        //given
        PhoneBook phoneBook = new PhoneBook();

        //actual
        phoneBook.add("eric", "3025884804");
        phoneBook.add("john", "3025844804");
        phoneBook.add("jane", "3025884704");
        String actual = phoneBook.lookup("eric");
        String actual1 = phoneBook.lookup("john");
        String actual2 = phoneBook.lookup("jane");

        //expected
        String expected = "3025884804";
        String expected1 = "3025844804";
        String expected2 = "3025884704";

        //test
        assertEquals(expected, actual);
    }

    @Test
    public void testRemove(){
        //given
        PhoneBook phoneBook = new PhoneBook();

        //actual
        phoneBook.add("eric", "3025884804");
        phoneBook.remove("eric");
        String actual = phoneBook.lookup("eric");

        //expected
        String expected = null;

        //test
        assertEquals(expected, actual);
    }

    @Test
    public void testRemoveMultiple(){
        //given
        PhoneBook phoneBook = new PhoneBook();

        //actual
        phoneBook.add("eric", "3025884804");
        phoneBook.add("john", "3025844804");
        phoneBook.add("jane", "3025884704");
        phoneBook.remove("john");
        phoneBook.remove("eric");
        String actual = phoneBook.lookup("john");
        String actual1 = phoneBook.lookup("eric");
        String actual2 = phoneBook.lookup("jane");

        //expected
        String expected = null;
        String expected1 = null;
        String expected2 = "3025884704";

        //test
        assertEquals(expected, actual);
        assertEquals(expected1, actual1);
        assertEquals(expected2, actual2);
    }

    @Test
    public void testReverseLookup(){
        //given
        PhoneBook phoneBook = new PhoneBook();

        //actual
        phoneBook.add("eric", "3025884804");
        phoneBook.add("john", "3025844804");
        phoneBook.add("jane", "3025884704");
        String actual = phoneBook.reverseLookup("3025884804");
        String actual1 = phoneBook.reverseLookup("3025844804");
        String actual2 = phoneBook.reverseLookup("3025884704");
        String actual3 = phoneBook.reverseLookup("4025884704");

        //expected
        String expected = "eric";
        String expected1 = "john";
        String expected2 = "jane";
        String expected3 = null;

        //test
        assertEquals(expected, actual);
        assertEquals(expected1, actual1);
        assertEquals(expected2, actual2);
    }
}