BitStream bs = new BitStream(new byte[] { 1, 2 }, 0, Byte.SIZE * 2);
assertEquals(1, bs.readBits(8, true).byteValue());
bs.setReadMark();
assertEquals(2, bs.readBits(8, true).byteValue());
assertEquals(-1, bs.readBit());
bs.goToReadMark();
assertEquals(2, bs.readBits(8, true).byteValue());
assertEquals(-1, bs.readBit());
bs.clearReadMark();
assertEquals(-1, bs.readBit());
assertEquals(0, bs.available());