@Test
public void loadPMMLRuleMappersNotEmpty() {

    final KnowledgeBuilderImpl kbuilderImpl = new KnowledgeBuilderImpl();
    assertTrue(kbuilderImpl.getPackageNames().isEmpty());
    assertNull(kbuilderImpl.getPackage(PACKAGE_NAME));
    final List<PMMLRuleMapper> pmmlRuleMappers = getPMMLRuleMappers();
    PMMLLoaderService.loadPMMLRuleMappers(kbuilderImpl, pmmlRuleMappers);
    assertEquals(1, kbuilderImpl.getPackageNames().size());
    assertNotNull(kbuilderImpl.getPackage(PACKAGE_NAME));
}