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

Question

我尝试为 Camunda Spring Boot 应用程序运行 JUnit 测试。我跟着测试：

JUnit 4

使用 JUnit 4 编写单元测试的风格，必须使用 ProcessEngineRule。通过此规则，流程引擎和服务可通过 getter 获得。与 ProcessEngineTestCase（见上文）一样，包含此规则将在类路径上查找默认配置文件。当使用相同的配置资源时，流程引擎静态缓存在多个单元测试上。

以下代码片段显示了使用 JUnit 4 测试风格和 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());
  }
}

但我收到一个错误：

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，但它不会被我的 Camunda Spring Boot 应用程序使用。感觉不对，把文件加到非测试源只是为了测试。它也会违反DRY，因为我必须同步两个配置。

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

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文件中读取：

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

您随心所欲创建myConfiguration的实例在哪里ProcessEngineConfiguration。

如果您使用的是 Spring Boot 运行程序，请尝试导入camunda-spring-boot-starter-test依赖项并StandaloneInMemoryTestConfiguration为此使用帮助程序：

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