harness.check(t.getActionListeners().length, 2, "must be 2 listeners");
t.removeActionListener(this);
harness.check(t.getActionListeners().length, 1, "must be 1 listener");
t.removeActionListener(new otherListener());
harness.check(t.getActionListeners().length, 1, "must still be 1 listener");
t.removeActionListener(other);
harness.check(t.getActionListeners().length, 0, "must be no listeners");