Assignment ass1 = newAssignment("1", 0, 1);
Assignment ass2 = newAssignment("2", 0, 1);
EventOrderConstraint oc1 = new EventOrderConstraint(ass1.getEvent());
EventOrderConstraint oc2 = new EventOrderConstraint(ass2.getEvent());
oc2.addFollow(newEvent("ev3"));
ass1.getEvent().putConstraint(oc1);
ass2.getEvent().putConstraint(oc2);
ass2.getEvent().addFeature(special);