assertTrue(Arrays.equals(value1, h.extractByKey(key1, data)));
assertTrue(Arrays.equals(value2, h.extractByKey(key2, data)));
assertEquals(null, h.extractByKey(key3, data));
assertEquals(2, h.countCollisions(key1, data));
assertEquals(2, h.countCollisions(key2, data));
assertEquals(-2, h.countCollisions(key3, data));
newLength = h.removeByKey(key1, data);
data = Arrays.copyOf(data, newLength);
assertEquals(null, h.extractByKey(key1, data));
assertTrue(Arrays.equals(value2, h.extractByKey(key2, data)));