CollectionTest.java

package com.tfnico.examples.guava;

import static org.junit.Assert.assertEquals;

import java.util.HashSet;
import java.util.Set;

import org.junit.Test;

import com.google.common.collect.Constraints;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;


public class CollectionTest {

    //Some customers
    Customer bob = new Customer(1, "Bob");
    Customer lisa = new Customer(2, "Lisa");
    Customer stephen = new Customer(3, "Stephen");
    Customer ken = new Customer(null,"Ken");

	
    
    
	@Test
	public void someSets()
	{
		ImmutableSet<Customer> customers1 = ImmutableSet.of(bob, lisa, stephen);
		ImmutableSet<Customer> customers2 = ImmutableSet.of(stephen, ken);
		
		assertEquals(4, Sets.union(customers1, customers2).size());
		
		assertEquals(ImmutableSet.of(stephen), Sets.intersection(customers1, customers2));
	}
	
	
	@Test(expected=NullPointerException.class)
	public void someConstraints()
	{
		HashSet<Customer> customers = Sets.newHashSet(); //instead of new HashSet<Customer>()
		customers.add(null); //this works. But should it?
		
		Set<Customer> noMoreNulls = Constraints.constrainedSet(customers, Constraints.notNull());
		noMoreNulls.add(null); //boom!
	}
	
	@Test
	public void some() {
		//TODO: Add more collections demos
	}
	
	
	
}