ZCW-PhoneBook/PhoneBookTest.java

import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.*;
import java.util.stream.Collectors;

/**
 * The test class PhoneBookTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class PhoneBookTest
{
    TreeMap<String, String> phonebook = new TreeMap<>(); 
    PhoneBook pb = new PhoneBook(phonebook);

    @Test
    public void testAdd()
    {
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890"; 
        pb.add(name, phoneNumber);
        assertFalse(phonebook.isEmpty());

    }

    @Test
    public void testRemove() 
    {   
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890";
        String name1 = "Marcus"; 
        String phoneNumber1= "650-789-1234";
        pb.add(name, phoneNumber);
        
        
        pb.remove(name);
        assertTrue(phonebook.isEmpty());

    }
    
       @Test
    public void testRemoveRecord()
    {   
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890"; 

        pb.add(name, phoneNumber);
        pb.remove(name);
        assertTrue(phonebook.isEmpty());

    }

    @Test
    public void testLookup()
    {
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890"; 
        pb.add(name, phoneNumber);
        Collection<String> expected = phonebook.values(); 

        assertEquals(expected, pb.lookup(name));
    }

    @Test
    public void testReverseLookup() {
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890"; 
        pb.add(name, phoneNumber);
        Collection<String> expected = phonebook.keySet(); 

        assertEquals(expected, pb.reverseLookup(phoneNumber));
    }

    @Test
    public void testDisplay() 
    {       
        String name = "Ryan"; 
        String phoneNumber= "123-456-7890"; 
        pb.add(name, phoneNumber);
        TreeMap<String, String> expected = phonebook; 
        
        assertEquals(expected, pb.display());
    }
    
}