FastStringBuffer buf = new FastStringBuffer(0);
assertFalse(buf.endsWith('"'));
buf.append("a");
assertFalse(buf.endsWith('"'));
assertTrue(buf.endsWith('a'));
buf.deleteFirst();
assertFalse(buf.endsWith('"'));
assertFalse(buf.endsWith('a'));
buf.append("ab");
assertTrue(buf.endsWith('b'));
assertFalse(buf.endsWith('a'));