@Override
    public Position offsetToPosition(int offset, Bias bias) {
        return position(0, 0).offsetBy(offset, bias);
    }
@Test
    public void testLeftBoundary() {
        Position pos = navigator.offsetToPosition(25, Forward).offsetBy(-50, Forward);
        assertEquals(0, pos.getMajor());
        assertEquals(0, pos.getMinor());
    }