@Override
    public Map<String, String> getSourcesMap() {
        return Collections.unmodifiableMap(sourcesMap);
    }
@Test
    void addToGetSourcesMap() {
        assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() -> {
            Map<String, String> retrieved = kiePMMLModelWithSources.getSourcesMap();
            retrieved.put("KEY", "VALUE");
        });
    }