@Test
public void testCheckboxGroup() {
CheckboxGroup<String> group = new CheckboxGroup<>("cg", KEYS);
assertNull(group.getValue());
assertFalse(group.isChecked("a"));
group.setValue(new String[] {"a"});
assertTrue(group.isChecked("a"));
assertFalse(group.isChecked("b"));
group.getPrinter(out).print("a", "alpha");
out.assertOutNormed("<label><input type='checkbox' name='cg' value='a' checked>alpha</label>");
group.getPrinter(out).print(null, null);
out.assertOutNormed("<input type='checkbox' name='cg' value=''>");
assertSame(KEYS, group.getKeyList());
group.getPrinter(out).print(1);
out.assertOutNormed("<label><input type='checkbox' name='cg' value='b'>beta</label>");
group.setValue(null);
group.print(out);
out.assertOutNormed(
"<label><input type='checkbox' name='cg' value='a'>alpha</label><br>\n<label><input type='checkbox' name='cg' value='b'>beta</label><br>\n");
}
