一个选项是使用ReflectionTestUtils类注入mock。在下面的代码中，我已经用JUnit4执行了单元测试。
我有以下一组类：
public abstract class ParentClass {
@Autowired
private SomeService service;
protected Item getItem() {
return service.foo();
}
protected abstract doSomething();
}
@Component
public ChildClass extends ParentClass {
private final SomeOtherService someOtherService;
@Override
protected doSomething() {
Item item = getItem(); //invoking parent class method
.... do some stuff
}
}
尝试测试儿童类：
@RunWith(MockitoJUnitRunner.class)
public class ChildClassTest {
@Mock
private SomeOtherService somerOtherService;
@Mock
private SomerService someService; //dependency at parent class
@InjectMocks
private ChildClass childClass;
public void testDoSomethingMethod() {
Item item = new Item();
when(someService.getItem()).thenReturn(item);
childClass.doSomething();
}
}
问题是，我总是得到一个NullPointerException，因为父依赖项(SomeService(总是为null。
也尝试过：
Mockito.doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocationOnMock) throws Throwable {
return new Item();
}
}).when(someService).getItem();
和使用间谍，没有任何成功。
谢谢你的提示。
@RunWith(MockitoJUnitRunner.class)
public class ChildClassTest {
@Mock
private SomeService someService;
@Test
public void test_something() {
ChildClass childClass = new ChildClass();
ReflectionTestUtils.setField(childClass, "service", someService);
when(someService.foo()).thenReturn("Test Foo");
assertEquals("Child Test Foo", childClass.doSomething());
}
}