@Test
  public void testSimpleReturnValueConstraintEvaluator() throws Exception {
    final InternalKnowledgePackage pkg = new KnowledgePackageImpl("pkg1");

    ProcessDescr processDescr = new ProcessDescr();
    processDescr.setClassName("Process1");
    processDescr.setName("Process1");

    WorkflowProcessImpl process = new WorkflowProcessImpl();
    process.setName("Process1");
    process.setPackageName("pkg1");

    ReturnValueDescr descr = new ReturnValueDescr();
    descr.setText("return value;");

    KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl(pkg);
    DialectCompiletimeRegistry dialectRegistry =
        pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
    JavaDialect javaDialect = (JavaDialect) dialectRegistry.getDialect("java");

    ProcessBuildContext context =
        new ProcessBuildContext(
            pkgBuilder, pkg, process, processDescr, dialectRegistry, javaDialect);

    pkgBuilder.addPackageFromDrl(new StringReader("package pkg1;\nglobal Boolean value;"));

    ReturnValueConstraintEvaluator node = new ReturnValueConstraintEvaluator();

    final JavaReturnValueEvaluatorBuilder builder = new JavaReturnValueEvaluatorBuilder();
    builder.build(context, node, descr, null);

    ProcessDialectRegistry.getDialect(JavaDialect.ID).addProcess(context);
    javaDialect.compileAll();
    assertEquals(0, javaDialect.getResults().size());

    final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    List<KnowledgePackage> packages = new ArrayList<KnowledgePackage>();
    packages.add(pkgBuilder.getPackage());
    kbase.addKnowledgePackages(packages);
    final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

    ksession.setGlobal("value", true);

    RuleFlowProcessInstance processInstance = new RuleFlowProcessInstance();
    processInstance.setKnowledgeRuntime((InternalKnowledgeRuntime) ksession);

    SplitInstance splitInstance = new SplitInstance();
    splitInstance.setProcessInstance(processInstance);

    assertTrue(node.evaluate(splitInstance, null, null));

    ksession.setGlobal("value", false);

    assertFalse(node.evaluate(splitInstance, null, null));
  }
  /**
   * 加载规则package
   *
   * @param userRule
   */
  private void loadPackage(UserRule userRule) {
    if (kBase.getKiePackage("com.camel.drools.expert.sample." + userRule.getUserCode()) != null) {
      return;
    }

    final KnowledgeBuilderImpl builder = new KnowledgeBuilderImpl();
    File file =
        new File(
            KieSpringBasicService.class.getResource("/").getPath().toString()
                + drlDirPath
                + userRule.getUserCode()
                + ".drl");
    try {
      String drl = FileUtils.readFileToString(file);
      builder.addPackageFromDrl(new StringReader(drl));
      if (builder.hasErrors()) {
        System.out.println("[ERROR: Parsing drl error: " + builder.getErrors());
      }
    } catch (DroolsParserException | IOException e) {
      e.printStackTrace();
    }
    ((InternalKnowledgeBase) kBase).addPackage(builder.getPackage());
  }