[英]Mocking an interface with Mockito
Can someone please help me with the below Mock object.有人可以帮我处理下面的 Mock 对象。 I want to write a mock test case for ServiceImpl class.
我想为 ServiceImpl 类编写一个模拟测试用例。 I want to mock OrderIF interface:
我想模拟 OrderIF 接口:
public interface OrderIF{
List<Order> ordersFor(String type);
}
The implementation of service is:服务的实现是:
public class ServiceImpl implements Service {
private List <Order> orders ;
private OrderIF orderif ; // this is 3rd party interface
public int getval(String type) {
//some code
// this returns a list of objects (orders)
orders = orderif.ordersFor(type);
// some code
return orders.get(0)
}
}
My code give NullPoinerException:我的代码给出 NullPoinerException:
public class ServiceImplTest {
private List <Order> ll ;
private service reqService ;
@InjectMocks
private orderIF order;
@Before
public void setUp() throws Exception {
ll = new ArrayList<Order> ();
ll.add(new Order("Buy" , 11 , "USD" ));
ll.add(new Order("Sell" , 22 , "USD" ));
reqService = spy(new ServiceImpl());
}
@Test
public void test() {
String type= "USD" ;
when(order.ordersFor(type)).thenReturn(ll);
q = reqService.getval(type);
assertTrue(q.get().ask == 232.75);
}
}
@InjectMocks
will not instantiate or mock your class. @InjectMocks
不会实例化或模拟您的课程。 This annotation is used for injecting mocks into this field.此注释用于将模拟注入此字段。
If you want to test serviceImpl
you will need to mock in this way:如果你想测试
serviceImpl
你将需要以这种方式模拟:
@Mock
private OrderIF order;
@InjectMocks
private Service reqService = new ServiceImpl();
To make it work you either need to use runner or MockitoAnnotations.initMocks(this);
要使其工作,您需要使用 runner 或
MockitoAnnotations.initMocks(this);
in @Before
method.在
@Before
方法中。
I'm guessing that order
is null
and you're getting the NullPointerException
here:我猜这个
order
是null
的,你在这里得到NullPointerException
:
when(order.ordersFor(type)).thenReturn(ll);
For @InjectMocks
to work and instantiate your class, you'll need to add a runner:要使
@InjectMocks
工作并实例化您的类,您需要添加一个运行器:
@RunWith(MockitoJUnitRunner.class)
public class ServiceImplTest {
// ...
}
You don't have to use the runner, refer to the documentation for alternatives.您不必使用跑步者,请参阅文档以获取替代方案。
@InjectMocks
doesn't work on interface. @InjectMocks
在界面上不起作用。 It needs concrete class to work with.它需要具体的类来使用。
Also @InjectMocks
is used to inject mocks to the specified class and @Mock
is used to create mocks of classes which needs to be injected.此外,
@InjectMocks
用于将模拟注入指定的类,@ @Mock
用于创建需要注入的类的模拟。
So for your case to work you have to do following change因此,要使您的案例起作用,您必须进行以下更改
@Mock
private OrderIF order;
@InjectMocks
private ServiceImpl reqService;
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