SimpleConnectionSelection selection = setupConnection();
// insert a new control point to make a total of three
conn.getPoints().add(1, new Point2D.Double(105, 90));
selection.startDragging(105, 90);
assertTrue(selection.isDragging());
selection.updatePosition(120, 50);
selection.updatePosition(110, 40);
selection.updatePosition(105, 31);
selection.stopDragging(105, 31);
assertFalse(selection.isDragging());
assertEquals(2, conn.getPoints().size());