ZCW-PhoneBook/PhoneBookTest.java

import org.junit.Assert;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap; 
import java.util.ArrayList;
/**
 * The test class PhoneBookTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class PhoneBookTest
{
    PhoneBook book;
    @Before
    public void setUp()
    {
        this.book = new PhoneBook();
    }

    @Test
    public void addTest() {
        //Given

        //When
        book.add("Leeks", "194-345-3458");
        String lookup = book.lookup("Leeks");
        //Then
        Assert.assertEquals("194-345-3458", lookup);
    }

    @Test
    public void lookupTest() {
        //Given
        book.add("Leeks", "194-345-3458");
        book.add("Leeks", "345-234-4643");
        String phoneNumber = book.lookup("Leeks");
        //Then
        Assert.assertEquals("194-345-3458, 345-234-4643", phoneNumber);
    }

    @Test
    public void lookupTest1() {
        //Given
        book.add("Leeks", "194-345-3458");
        book.add("Leeks", "345-234-4643");
        String phoneNumber = book.lookup("Banana");
        //Then
        Assert.assertEquals("This entry doesn't exist. Please enter valid entry.", phoneNumber);
    }

    @Test
    public void removeTest() {
        //Given
        book.add("Leeks", "194-345-3458");
        book.add("Leeks", "345-234-4643");
        book.remove("Leeks", "194-345-3458");
        //When
        String phoneNumber = book.lookup("Leeks");
        //Then
        Assert.assertEquals("345-234-4643", phoneNumber);
    }

    @Test
    public void removeTest1() {
        //Given
        //When
        book.add("Leeks", "194-345-3458");
        book.add("Leeks", "345-234-4643");
        book.remove("Leeks", "194-345-3458");
        book.remove("Leeks", "345-234-4643");
        //Then
        Assert.assertEquals("This entry doesn't exist. Please enter valid entry.", book.lookup("Leeks"));
    }

    @Test
    public void reverseLookupTest() {
        //Given
        book.add("Leeks", "194-345-3458");
        //When
        String name = book.reverseLookup("194-345-3458");
        //Then
        Assert.assertEquals("Leeks", name);
    }

    @Test
    public void reverseLookupTest1() {
        //Given
        book.add("Leeks", "194-345-3458");
        book.remove("Leeks", "194-345-3458");
        //When
        String name = book.reverseLookup("194-345-3458");
        //Then
        Assert.assertEquals("This entry doesn't exist. Please enter valid entry.", name);
    }
}