@Test
public void testConvert11_Boolean() {

    BooleanForm11 form = new BooleanForm11(true, false, null);
    Map<String, String> map = converter.convert(form);
    assertThat(map.size(), is(3));
    assertThat(map, hasEntry("bool1", "true"));
    assertThat(map, hasEntry("bool2", "false"));
    assertThat(map, hasEntry("bool3", ""));
}