panel.add(c5, cc.xy(1, 5));
panel.add(c6, cc.xy(1, 6));
panel.add(c7, cc.xy(1, 7));
panel.add(c8, cc.xy(1, 8));
panel.doLayout();
assertEquals("[10px, c1_min].height", 10, c1.getHeight());
assertEquals("[10px, c2_min].height", 20, c2.getHeight());
assertEquals("[10px,c3_pref].height", 10, c3.getHeight());
assertEquals("[10px,c4_pref].height", 40, c4.getHeight());