@Test
public void loadPMMLRuleMappersEmpty() {

    final KnowledgeBuilderImpl kbuilderImpl = new KnowledgeBuilderImpl();
    assertTrue(kbuilderImpl.getPackageNames().isEmpty());
    assertNull(kbuilderImpl.getPackage(PACKAGE_NAME));
    final List<PMMLRuleMapper> pmmlRuleMappers = Collections.emptyList();
    PMMLLoaderService.loadPMMLRuleMappers(kbuilderImpl, pmmlRuleMappers);
    assertTrue(kbuilderImpl.getPackageNames().isEmpty());
    assertNull(kbuilderImpl.getPackage(PACKAGE_NAME));
}