英文:
how to mock private variable in RestController class
问题
以下是您要翻译的内容：
我正在使用Spring进行一些Web单元测试。是否有一种方法可以模拟在@PostConstruct中设置的MyProcessor实例？我尝试过使用@MockBean，但它被设置为null，然后出现空指针异常？
我正在使用工厂根据某些布尔标志实例化MyProcessor。但如果有其他完全不同的方法可以使我的测试更清晰，我也可以接受。
请注意，我正在使用Junit 5。
public class Controller {private final AProcessorFactory factory;@Value("${tt.f.processor.async}")private boolean isAsync;private MyProcessor myProcessor;public Controller(final AProcessorFactory factory) {this.factory = factory;}@PostConstructpublic void init() {myProcessor = factory.getInstance(isAsync);}}@WebMvcTest(Controller.class)public class ControllerTest{@MockBeanprivate MyProcessor processor;@MockBeanprivate AProcessorFactory factory;@Autowiredprivate MockMvc mockMvc;@Testpublic void test() throws Exception {when(processor.process(any(Request.class), any(String.class))).thenReturn(new TestResponse("123", SUCCESS, "", ""));}}
英文:
I am doing some web unit testing with Spring. is there a way I can mock the instance of MyProcessor which get set in @PostConstruct? I tried with @MockBean but it gets set as null and getting null pointer exception?
I am using a factory to instantiate MyProcessor based on some boolean flag. But if there is a different approach altogether that would make my test cleaner, I am open to ideas.
Please Note I am using Junit 5.
public class Controller {private final AProcessorFactory factory;@Value("${tt.f.processor.async}")private boolean isAsync;private MyProcessor myProcessor;public Controller(final AProcessorFactory factory) {this.factory= factory;}@PostConstructpublic void init() {myProcessor = factory.getInstance(isAsync);}}@WebMvcTest(Controller.class)public class ControllerTest{@MockBeanprivate MyProcessor processor;@MockBeanprivate AProcessorFactory factory;@Autowiredprivate MockMvc mockMvc;@Testpublic void test() throws Exception {when(processor.process(any(Request.class), any(String.class))).thenReturn(new TestResponse("123", SUCCESS, "", ""));}
答案1
得分: 1
看起来你的 myProcessor 实际上是由你的 AProcessorFactory 在 PostConstruct 的 init() 方法中构建的。
你需要为你的 AProcessorFactory 模拟提供一种行为。
首先，你可能会想在构造函数中设置你的 myProcessor，因为 @PostConstruct 的 init() 方法没有特殊的上下文加载逻辑。
public class Controller {@Value("${tt.f.processor.async}")private boolean isAsync;private MyProcessor myProcessor;public Controller(final AProcessorFactory factory) {this.myProcessor = factory.getInstance(isAsync);}}
你可以在测试的 @Before 步骤中指定这一点。
@MockBeanprivate AProcessorFactory factory;@Beforepublic void setUp() {when(processor.process(any(Request.class), any(String.class))).thenReturn(new TestResponse("123", SUCCESS, "", ""));when(factory.getInstance(any())).thenReturn(processor);}
Spring 将会注册你的 AProcessorFactory 模拟，并加载适当的行为。
英文:
It looks like your myProcessor is actually built by your AProcessorFactory in a PostConstruct init() method.
You'll want to provide a behavior for your AProcessorFactory mock.
First, you would probably want to set up your myProcessor in your constructor as the @PostConstruct init() method has no special context loading logic with it.
public class Controller {@Value("${tt.f.processor.async}")private boolean isAsync;private MyProcessor myProcessor;public Controller(final AProcessorFactory factory) {this.myProcessor = factory.getInstance(isAsync);}}
You can specify this in a @Before step in your test.
@MockBeanprivate AProcessorFactory factory;@Beforepublic void setUp() {when(processor.process(any(Request.class), any(String.class))).thenReturn(new TestResponse("123", SUCCESS, "", ""));when(factory.getInstance(any())).thenReturn(processor)}
Spring will register your AProcessorFactory mock that has been loaded with the appropriate behaviors.
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