@Test
public void shouldReturnNullWhenNoTypeRegisteredForLevelAndValueIsNull() {

    // when
    Parameter metadata = new SimpleParameter().withLevel(new SimpleLevel().withName("nullValue"));
    ParameterEntry entry = new SimpleParameterEntry((String) null);
    // when
    MapEntry map = converter.asMap(metadata, entry);
    // then
    assertThat(map.get("nullValue")).isNull();
}