Question

我尝试为Camunda Spring Boot应用程序运行JUnit测试。我关注了Testing：

JUnit 4

使用JUnit 4风格编写单元测试，必须使用ProcessEngineRule。通过此规则，可以通过getter获得流程引擎和服务。与ProcessEngineTestCase一样（请参见上文），包括此规则将在类路径上查找默认配置文件。使用相同的配置资源时，流程引擎会静态地缓存在多个单元测试中。

以下代码段显示了使用JUnit 4测试风格以及ProcessEngineRule用法的示例。
public class MyBusinessProcessTest {

  @Rule
  public ProcessEngineRule processEngineRule = new ProcessEngineRule();

  @Test
  @Deployment
  public void ruleUsageExample() {
    RuntimeService runtimeService = processEngineRule.getRuntimeService();
    runtimeService.startProcessInstanceByKey("ruleUsage");

    TaskService taskService = processEngineRule.getTaskService();
    Task task = taskService.createTaskQuery().singleResult();
    assertEquals("My Task", task.getName());

    taskService.complete(task.getId());
    assertEquals(0, runtimeService.createProcessInstanceQuery().count());
  }
}

但是我得到一个错误：

org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [activiti.cfg.xml]; nested exception is java.io.FileNotFoundException: class path resource [activiti.cfg.xml] cannot be opened because it does not exist
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:344)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
    at org.camunda.bpm.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfiguration(BeansConfigurationHelper.java:35)
    at org.camunda.bpm.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfigurationFromResource(BeansConfigurationHelper.java:50)
    at org.camunda.bpm.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(ProcessEngineConfiguration.java:305)
    at org.camunda.bpm.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(ProcessEngineConfiguration.java:301)
    at org.camunda.bpm.engine.impl.test.TestHelper.getProcessEngine(TestHelper.java:428)
    at org.camunda.bpm.engine.test.ProcessEngineRule.initializeProcessEngine(ProcessEngineRule.java:175)
    at org.camunda.bpm.engine.test.ProcessEngineRule.apply(ProcessEngineRule.java:154)
    at org.junit.rules.RunRules.applyAll(RunRules.java:26)
    at org.junit.rules.RunRules.<init>(RunRules.java:15)
    at org.junit.runners.BlockJUnit4ClassRunner.withTestRules(BlockJUnit4ClassRunner.java:400)
    at org.junit.runners.BlockJUnit4ClassRunner.withRules(BlockJUnit4ClassRunner.java:356)
    at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:278)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
Caused by: java.io.FileNotFoundException: class path resource [activiti.cfg.xml] cannot be opened because it does not exist
    at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:172)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:330)
    ... 27 more

我可以添加activiti.cfg.xml，但是我的Camunda Spring Boot应用程序不会使用它。只是将文件添加到非测试源以进行测试，这是错误的。这也将违反DRY，因为我必须同步两个配置。

在我的JUnit测试中还有其他使用ProcessEngineRule的方法吗？

Answer 1

您可以使用这样的引擎实例化规则，然后Camunda不会尝试从cfg.xml文件中进行读取：

 @Rule
 public final ProcessEngineRule camunda = new ProcessEngineRule(myConfiguration.buildProcessEngine());

其中myConfiguration是您创建的ProcessEngineConfiguration的实例。

如果您使用的是Spring Boot运行器，请尝试导入camunda-spring-boot-starter-test依赖项，并为此使用StandaloneInMemoryTestConfiguration帮助器：

@Rule
public final ProcessEngineRule camunda = new StandaloneInMemoryTestConfiguration().rule();

Answer 2

您在应用程序中使用@EnableProcessApplication吗？如果是，我认为您实际上不再需要org.camunda.bpm.engine.test.ProcessEngineRule：

您可以通过@Autowired RuntimeService runtimeService;
您可以通过BpmPlatform.getDefaultProcessEngine()

但是无论如何，如果您真的想使用该规则：

编写自己的课程：

public class MyProcessEngineRule extends ProcessEngineRule {

    @Override
    public Statement apply(Statement base, Description description) {
        // you can use this, if you use AbstractAssertions
        // super.processEngine = AbstractAssertions.processEngine(); 
        super.processEngine = processEngine();
        return super.apply(base, description);
    }

    public static ProcessEngine processEngine() {
        Map<String, ProcessEngine> processEngines = ProcessEngines.getProcessEngines();
        if (processEngines.size() == 1) {
            return processEngines.values().iterator().next();
        } else {
            throw new IllegalStateException("some usefule message");
        }
    }
}

并在测试类中使用@Rule public MyProcessEngineRule rule = new MyProcessEngineRule();。

至少对我有用...

如何在Camunda Spring Boot应用程序的Junit测试中使用ProcessEngineRule？

2 个答案: