如何創建一個mocked（由jmockit）spring bean？

Question

我是jmockit的新手，並且想要在基於Java的Spring應用程序配置中模擬一個bean。我想（希望更好），它會是這樣的：

@Configuration 
public class MyApplicationConfig { 

    @Bean // this bean should be a mock 
    SomeService getSomeService() { 
    return new MockUp<SomeService>() {@Mock String someMethod() { return ""; }}.getMockInstance(); 
    } 

    @Bean // some other bean that depends on the mocked service bean 
    MyApplication getMyApplication(SomeService someService) { 
    .... 
    } 
} 

但不幸的是這種失敗，「申請一個模擬式無效的地方」。

我不知道我是否可以在Spring Configuration類中生成jmockit mocks。我需要這個bean，因爲它被其他bean引用，並且如果我不提供作爲Spring bean的模擬器，整個Spring上下文初始化失敗。

感謝您的任何幫助。

Answer 1

只需使用您的常規Spring配置。在測試類中，聲明要用@Capturing模擬的類型。它會嘲笑Spring使用的任何實現類。

編輯：在下面添加完整的示例代碼。

import javax.inject.*; 

public final class MyApplication { 
    private final String name; 
    @Inject private SomeService someService; 

    public MyApplication(String name) { this.name = name; } 

    public String doSomething() { 
     String something = someService.doSomething(); 
     return name + ' ' + something; 
    } 
} 

---

public final class SomeService { 
    public String getName() { return null; } 
    public String doSomething() { throw new RuntimeException(); } 
} 

---

import org.springframework.context.annotation.*; 

@Configuration 
public class MyRealApplicationConfig { 
    @Bean 
    SomeService getSomeService() { return new SomeService(); } 

    @Bean 
    MyApplication getMyApplication(SomeService someService) { 
     String someName = someService.getName(); 
     return new MyApplication(someName); 
    } 
} 

---

import javax.inject.*; 
import org.junit.*; 
import org.junit.runner.*; 
import static org.junit.Assert.*; 
import mockit.*; 
import org.springframework.test.context.*; 
import org.springframework.test.context.junit4.*; 

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration(classes = MyRealApplicationConfig.class) 
public final class MyApplicationSpringTest { 
    @Inject MyApplication myApplication; 
    @Mocked SomeService mockService; 

    @BeforeClass // runs before Spring configuration 
    public static void setUpMocksForSpringConfiguration() { 
     new MockUp<SomeService>() { 
      @Mock String getName() { return "one"; } 
     }; 
    } 

    @Test 
    public void doSomethingUsingMockedService() { 
     new Expectations() {{ mockService.doSomething(); result = "two"; }}; 

     String result = myApplication.doSomething(); 

     assertEquals("one two", result); 
    } 
} 

---

import org.junit.*; 
import static org.junit.Assert.*; 
import mockit.*; 

// A simpler version of the test; no Spring. 
public final class MyApplicationTest { 
    @Tested MyApplication myApplication; 
    @Injectable String name = "one"; 
    @Injectable SomeService mockService; 

    @Test 
    public void doSomethingUsingMockedService() { 
     new Expectations() {{ mockService.doSomething(); result = "two"; }}; 

     String result = myApplication.doSomething(); 

     assertEquals("one two", result); 
    } 
} 

Answer 2

Spring-ReInject旨在用嘲笑取代豆。