cannot have an existing value

ゝ一纸荒年。 2022-11-11 05:51 108阅读 0赞

写单元测试遇到下面的问题  
BaseTest 中的producer 已经存在值了再次被赋值导致系统异常  
org.springframework.beans.factory.BeanCreationException:  
Could not inject field: protected mq.producer.Producer BaseTest.producer; nested exception is java.lang.IllegalStateException: The field protected mq.producer.Producer BaseTest.producer cannot have an existing value

mock赋值  
org.springframework.boot.test.mock.mockito.MockitoPostProcessor\#inject(java.lang.reflect.Field, java.lang.Object, java.lang.String)

private void inject(Field field, Object target, String beanName) { 
    		try { 
    			field.setAccessible(true);
    			Assert.state(ReflectionUtils.getField(field, target) == null,
    					() -> "The field " + field + " cannot have an existing value");
    			Object bean = this.beanFactory.getBean(beanName, field.getType());
    			ReflectionUtils.setField(field, target, bean);
    		}
    		catch (Throwable ex) { 
    			throw new BeanCreationException("Could not inject field: " + field, ex);
    		}
    	}

出现问题的原因是 我的单元测试使用了

@RunWith(SpringJUnit4ClassRunner.class)
    @SpringBootTest(classes = Application.class)

@RunWith(JMockit.class)

两种方式  
在idea中执行文件夹的时候  
在JUNIT执行中发现 当下面runners 中只有一个类的时候是没有任何问题的，多个runner复用的时候 可能会引发一系列的问题。后续类似奇怪的问题可以参考此方案查询  
org.junit.runner.JUnitCore\#run(org.junit.runner.Runner)

runner = { IdeaSuite48@2281} 
     myName = "test"
     runners = { Collections$UnmodifiableRandomAccessList@2286}  size = 8
      0 = { JMockit@2292} 
      1 = { SpringJUnit4ClassRunner@2293} 
      2 = { SpringJUnit4ClassRunner@2294} 
      3 = { SpringJUnit4ClassRunner@2295} 
      4 = { SpringJUnit4ClassRunner@2296} 
      5 = { SpringJUnit4ClassRunner@2297} 
      6 = { SpringJUnit4ClassRunner@2298} 
      7 = { SpringJUnit4ClassRunner@2299} 
     childrenLock = { Object@2287} 
     testClass = { TestClass@2288} 
     filteredChildren = { Collections$UnmodifiableCollection@2289}  size = 8
     scheduler = { ParentRunner$1@2290}

依赖包

<dependency>
    			<groupId>org.jmockit</groupId>
    			<artifactId>jmockit</artifactId>
    			<version>1.8</version>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<version>2.1.2.RELEASE</version>
    			<scope>test</scope>
    		</dependency>

使用下面的注解就也么有问题

@RunWith(MockitoJUnitRunner.Silent.class)

<dependency>
    			<groupId>org.mockito</groupId>
    			<artifactId>mockito-core</artifactId>
    			<version>2.21.0</version>
    			<scope>test</scope>
    		</dependency>