@Test
public void testHead() {

	final RingBuffer<Integer> ring = new RingBufferSimple<Integer>(10);
	assertEquals(ring.length(), 10);
	ring.setHead(100, 100);
	assertEquals(ring.count(), 1);
	assertEquals(ring.get(100), (Integer) 100);
	for (int k = 101; k < 110; k++) {
		assertEquals(ring.get(k), null);
	}
	for (int k = 100; k < 110; k++) {
		ring.set(k, k);
	}
	assertEquals(ring.count(), 10);
	for (int k = 100; k < 110; k++) {
		assertEquals(ring.get(k), (Integer) k);
	}
	ring.setHead(105, 205);
	assertEquals(ring.count(), 5);
	assertEquals(ring.head(), 105);
	assertEquals(ring.tail(), 114);
	assertEquals(ring.get(105), (Integer) 205);
	for (int k = 106; k < 110; k++) {
		assertEquals(ring.get(k), (Integer) k);
	}
	for (int k = 110; k < 115; k++) {
		assertEquals(ring.get(k), (Integer) null);
	}
	ring.set(114, 114);
	assertEquals(ring.count(), 6);
	assertEquals(ring.get(114), (Integer) 114);
}