用mockito进行DAO层单元测试
用mockito进行DAO层单元测试
提问于 2015-12-10 10:26:03
我正在尝试使用Mockito进行Spring + Hibernate项目的单元测试。以下是我的DAO类的实现：
@Repository
public class EmployeeDAOImpl implements EmployeeDAO {
@Autowired
private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
System.out.println("Session factory");
}
@Override
public ArrayList<Employees> getAllData() {
System.out.println("Inside get all data");
Session session = sessionFactory.getCurrentSession();
System.out.println("session created");
Criteria cr = session.createCriteria(Employees.class, "employees").setResultTransformer(
Criteria.DISTINCT_ROOT_ENTITY);
return (ArrayList<Employees>) cr.list();
}
}以下是我的考试课程：
public class EmployeeDAOImplTest {
@Mock
private SessionFactory sessionFactory;
@Mock
private Session session;
@Mock
Criteria criteria;
@Spy
ArrayList<Employees> employees = new ArrayList<Employees>();
private EmployeeDAO dao;
@Before
public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
dao = new EmployeeDAOImpl();
dao.setSessionFactory(sessionFactory);
employees = getEmpDetails();
Mockito.doReturn(session).when(sessionFactory).getCurrentSession();
}
@Test
public void testGetAllData() {
Mockito.doReturn(criteria).when(session)
.createCriteria(ConceptModelDetails.class);
Mockito.doReturn(employees).when(criteria).list();
assertEquals(employees, dao.getAllData());
}
private ArrayList<Employees> getEmpDetails() {
ArrayList<Employees> array = new ArrayList<Employees>();
Employees emp = new Employees();
emp.setName("xyz");
emp.setId(12);
array.add(cm);
return array;
}
}employees是员工的虚拟数组列表。请建议他发布了什么here.When --我运行了这个测试用例，我得到了一个失败的Null指针异常：
Criteria cr = session.createCriteria(Employees.class, "employees").setResultTransformer(
Criteria.DISTINCT_ROOT_ENTITY);堆栈跟踪：
java.lang.NullPointerException
at com.assignment.dao.impl.EmployeeDAOImpl.getAllData(EmployeeDAOImpl.java:77)
at com.assignment.DAOTest.EmployeeDAOImplTest.testGetAllData(EmployeeDAOImplTest.java:84)
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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)Stack Overflow用户
回答已采纳
发布于 2015-12-10 13:31:36
EmployeeDAOImpl包含以下代码：
Criteria cr = session.createCriteria(Employees.class, "employees").setResultTransformer(
Criteria.DISTINCT_ROOT_ENTITY);你的测试有：
Mockito.doReturn(criteria).when(session)
.createCriteria(ConceptModelDetails.class);据我从您的代码中可以看出，您正确地模拟了sessionFactory和它正在返回的session。但是，您没有正确地模拟出session.createCriteria(Employee.class, "employees") (相反，您正在为session.createCriteria(ConceptModelDetails.class)设置返回值)。因此，模拟的返回值将是null。因此，当您立即取消引用(调用setResultTransformer)时，您将得到一个NullPointerException。
要验证这一点，请尝试进入调试器，或向EmployeeDAOImpl添加日志语句，这些语句显示sessionFactory、session的值以及session.createCriteria(...)的结果。
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原文链接：
https://stackoverflow.com/questions/34199388
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