java - testng 套件第二次测试失败 -> nullpointerexception

Question

我有一些要使用 testng 套件执行的 Dao 测试我正在 @BeforeSuite 中初始化所有 daos 但只有第一个测试可以使用 daos ，其他测试在调用 dao 时生成空指针

任何帮助将不胜感激非常感谢

基础测试:

 public class BaseTest {

    protected DocumentDaoImpl documentDao;
    protected UserDaoImpl userDao;


  @BeforeSuite
  public void beforeSuite() {
        EntityManagerUtil.setPersistenceUnitName("db_test"); //initialize entityManagerFactory once for all tests as well as daos
        documentDao = DAOFactory.getDocumentDAO();
        userDao = DAOFactory.getUserDao();
  }

  @AfterSuite
  public void afterSuite() {
    EntityManagerUtil.closeEntityManagerFactory();
  }
}

测试 1:

public class DocumentDaoImplTest extends BaseTest{

    @Test(dataProviderClass = DocumentDataProvider.class, dataProvider = DocumentDataProvider.ONE_DOCUMENT_PROVIDER)
    public void findByMatricule(Document document) {
        documentDao.create(document);
        Document result = documentDao.findByMatricule(document.getMatricule());
        Assert.assertNotNull(result);
        Assert.assertEquals(result.getMatricule(), document.getMatricule());
    }
}

测试 2:

public class UserDaoImplTest extends BaseTest{

    @Test(dataProviderClass = UserDataProvider.class, dataProvider = UserDataProvider.ONE_USER_PROVIDER)
    public void findByDocumentId(User user) {
        // nullpointer userDao
        userDao.create(user);
        User result = userDao.findByDocumentId(user.getDocumentId());
        Assert.assertNotNull(result);
        Assert.assertEquals(result.getDocumentId(), user.getDocumentId());
    }

}

testng.xml

<test name="DAOTest">
    <packages>
        <package name="com.dev.test.dao"/>
    </packages> 
</test>

堆栈跟踪:

java.lang.NullPointerException
    at com.dev.test.dao.UserDaoImplTest.findByDocumentId(UserDaoImplTest.java:14)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:643)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
    at org.testng.TestRunner.privateRun(TestRunner.java:782)
    at org.testng.TestRunner.run(TestRunner.java:632)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
    at org.testng.SuiteRunner.run(SuiteRunner.java:268)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
    at org.testng.TestNG.run(TestNG.java:1064)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)

我做错了什么？如果独立运行，测试工作正常，只有当我一次运行所有测试时才会失败

非常感谢

Answer 1

你必须重做你的测试:

@BeforeSuite 只被套件调用一次。您有 2 个类，然后第一个类实例化了 dao，另一个没有实例化(在本例中为 NPE)。

一种选择是为您的 dao 使用 static。另一种解决方案是将 documentDao = DAOFactory.getDocumentDAO(); 放入 @BeforeClass 中。但是您可以找到许多其他(更好的)解决方案。