BitsTest.java

package com.badlogic.gdx.utils;

import static org.junit.Assert.*;

import org.junit.Test;

public class BitsTest {

	@Test
	public void testHashcodeAndEquals() {
		Bits b1 = new Bits();
		Bits b2 = new Bits();
		
		b1.set(1);
		b2.set(1);
		
		assertEquals(b1.hashCode(), b2.hashCode());
		assertTrue(b1.equals(b2));
		
		// temporarily setting/clearing a single bit causing
		// the backing array to grow
		b2.set(420);
		b2.clear(420);
		
		assertEquals(b1.hashCode(), b2.hashCode());
		assertTrue(b1.equals(b2));
		
		b1.set(810);
		b1.clear(810);
		
		assertEquals(b1.hashCode(), b2.hashCode());
		assertTrue(b1.equals(b2));
	}
	
	@Test
	public void testXor() {
		Bits b1 = new Bits();
		Bits b2 = new Bits();
		
		b2.set(200);
		
		// b1:s array should grow to accommodate b2
		b1.xor(b2);
		
		assertTrue(b1.get(200));
		
		b1.set(1024);
		b2.xor(b1);
		
		assertTrue(b2.get(1024));
	}
	
	@Test
	public void testOr() {
		Bits b1 = new Bits();
		Bits b2 = new Bits();
		
		b2.set(200);
		
		// b1:s array should grow to accommodate b2
		b1.or(b2);
		
		assertTrue(b1.get(200));
		
		b1.set(1024);
		b2.or(b1);
		
		assertTrue(b2.get(1024));
	}
	
	@Test
	public void testAnd() {
		Bits b1 = new Bits();
		Bits b2 = new Bits();
		
		
		b2.set(200);
		// b1 should cancel b2:s bit
		b2.and(b1);
		
		assertFalse(b2.get(200));
		
		b1.set(400);
		b1.and(b2);
		
		assertFalse(b1.get(400));
	}
}