我正在为映射类进行单元测试，但每次它都显示NullPointerException
@Mapper(componentModel = "spring")
public abstract class CountryMapper implements EntityMapper<CountryDTO, Country> {
static final public CountryMapper INSTANCE = Mappers.getMapper(CountryMapper.class);
@Autowired
CountryRepository countryRepository;
Country fromId(Long id) {
if (id == null) {
return null;
}
return countryRepository.findOne(id);
}
}
public class CountryMapperUnitTest {
CountryMapper countryMapper = CountryMapper.INSTANCE;
@Test
public void givenIdCountrytoCountry_whenMaps_thenCorrect() {
Long id = 1L;
Country country = countryMapper.fromId(id);
assertEquals(id, country.getId()); //NullPointerException
}
com.soft.prg.service.mapper.CountryMapperUnitTest.givenCountryDTOtoCountry_whenMaps_thenCorrect（CountryMapperUnitTest.java:26）中的java.lang.NullPointerException位于sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl . java：62）在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）at java.lang.reflect.Method.invoke（Method.java:498）at org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（ FrameworkMethod.java:50）org.junit.runners.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）atg.junit .internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78 ）org.junit.runners.BlockJUnit4ClassRunner.runChild（Blo ckJUnit4ClassRunner.java:57）org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）at org.junit.runners.ParentRunner .runChildren（ParentRunner.java:288）位于org.junit的org.junit.runners.rarentRunner.access $ 000（ParentRunner.java:58）org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268） . runners.ParentRunner.run（ParentRunner.java:363）位于org.eclipse.jdt.internal.junit.runner.TestExecution的org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86） . 运行（TestExecution.java:38）org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:459）org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner . java：678）org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:382）org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192）
当我在课程上添加 @RunWith (SpringRunner.class) 时，它会向我显示此错误
org.springframework.beans.factory.UnsatisfiedDependencyException：创建名为'com.soft.prg.service.mapper.CountryMapperUnitTest'的bean时出错：通过字段'countryMapper'表示的不满意的依赖关系;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有'com.soft.prg.service.mapper.CountryMapper'类型的限定bean可用：预计至少有1个bean有资格作为autowire候选者 . 依赖注释：{org.springframework.beans.factory.annotation.Autowired（required = true）}在org.springframework的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:588） . bean.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:88）位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:366） . populateBean（AbstractAutowireCapableBeanFactory.java:1264）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties（AbstractAutowireCapableBeanFactory.java:386）at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies（DependencyInjectionTestExecutionListener.java:118）在org.springframework.test.context.suppor t.DependencyInjectionTestExecutionListener.prepareTestInstance（DependencyInjectionTestExecutionListener.java：83）org.springframework.test.context.TestContextManager.prepareTestInstance（TestContextManager.java:230）org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest（SpringJUnit4ClassRunner.java： 228）org.springframework上的org.springframework.test.context.junit4.SpringJUnit4ClassRunner $ 1.runReflectiveCall（SpringJUnit4ClassRunner.java:287）org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12） . test.context.junit4.SpringJUnit4ClassRunner.methodBlock（SpringJUnit4ClassRunner.java:289）位于org.springframework.test.context.unit4.SpringJUnit4ClassRunner . runChild（SpringJUnit4ClassRunner.java:94）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）在org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）在org.junit.runners.ParentRunner.runChildren（ParentRunner.java ：288）在org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）维持在org.springframework.test.context.junit4 org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268） . 在Org.jun.runner.ParentRunner.run（ParentRunner.java： 363）在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run（SpringJUnit4ClassRunner.java:191）在org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）在org.eclipse org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests中的.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38） . moteTestRunner.java:459）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:678）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java： 382）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192）产生的原因：org.springframework.beans.factory.NoSuchBeanDefinitionException：无类型com.soft.prg的”合格的 beans . service.mapper.CountryMapper'可用：预计至少有1个bean可以作为autowire候选者 . 依赖注解：{@ org.springframework.beans.factory.annotation.Autowired（所需=真）}在org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound（DefaultListableBeanFactory.java:1493）在org.springframework.beans . or.s.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:1066）org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement上的factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1104） . 注入（AutowiredAnnotationBeanPostProcessor.java:585）......还有28个