tmp = "+++---".getBytes("US-ASCII");
b.append(tmp, 0, tmp.length);
b.remove(0, 3);
assertEquals(3, b.length());
assertEquals("---", new String(b.buffer(), 0, b.length(), "US-ASCII"));
b.remove(0, 3);
assertEquals(0, b.length());
tmp = "---+++".getBytes("US-ASCII");
b.append(tmp, 0, tmp.length);