Position p1 = c.createPosition(0);
Position p2 = c.createPosition(1);
harness.check(p1.getOffset(), 0);
harness.check(p2.getOffset(), 1);
c.insertString(0, "abcdefghijklmno");
harness.check(p1.getOffset(), 0);
harness.check(p2.getOffset(), 16);
c.insertString(5, "12345");
harness.check(p1.getOffset(), 0);