如何使用PowerMock EasyMock Junit Java模拟实例DAO方法

Question

我是单元测试的新手，有一些模拟dao层的要求，但没有得到如何做。以下是我的示例DAO代码，它正在进行一些交易活动。

 Class DAOList{
 public Object getRows(Map mapObj, Object error) {
    Session session = HibernateSessionManager.getSessionFactory().openSession();
    try {
        Query query = session.createSQLQuery("select * from some_table ").addEntity(SomeObject.class);
        Object getObj = query.uniqueResult();
        return getObj;
    }
    catch (HibernateException exc) {
        exc.printStackTrace();
        logger.error("Exception occurred: " + exc.getMessage());
    }
    finally {
        session.close();
    }
    return null;
}   }

我尝试像以下一样尝试编写测试案例，但我得到了运行时异常

    @TestSubject 
    Session sessionn;
    @Mock 
    Transaction transaction;
    @MockSession 
    session;
    @MockSQLQuery
    mockQuery;
    @Test
public void testSomeSuccessCheck() throws Exception {
    HashMap map = new HashMap();
    EasyMock.expect(HibernateSessionManager.getSessionFactory().openSession()).andReturn(sessionn);
    EasyMock.expect(session.beginTransaction()).andReturn(transactionn);
    EasyMock.expect(session.createSQLQuery(EasyMock.anyString()).addEntity(VehicleDetails.class)).andReturn(query);
    EasyMock.expect((SomeObject) query.uniqueResult()).andReturn(someObj);
    SomeObject respObj = vehDao.someMethod(map, errs);
    assertNotNull(respObj);
}

我得到的完整错误跟踪：

java.lang.runtimeException：在PowerMock测试听众org.powermock.api.extension.listener.listener.annotationenabler@5c87bfe2上调用beforetestmethod方法。

>

Caused by: java.lang.NullPointerException: Have you forgotten to instantiate connection?
at org.easymock.internal.Injector.injectMocks(Injector.java:81)
at org.easymock.EasyMockSupport.injectMocks(EasyMockSupport.java:528)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:1846)
at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:810)
at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:790)
at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:466)
at org.powermock.api.extension.listener.AnnotationEnabler.beforeTestMethod(AnnotationEnabler.java:73)
at org.powermock.tests.utils.impl.PowerMockTestNotifierImpl.notifyBeforeTestMethod(PowerMockTestNotifierImpl.java:82)

Answer 1

首先，您需要模拟静态方法调用 HibernateSessionManager.getSessionFactory((，然后模拟 opensession ((方法调用。休息将保持您所添加的内容。

请参考有关如何使用PowerMock的更多信息：https：//blog.codecentric.de/en/2016/03/junit-testing-using-using-using-using-mockito-powermock/

您也可以使用Mockito PowerMock解决相同的问题。