How to write JUnit test with Spring Autowire

Question

Here are the files that I use   component xml   lt  xml version  1 0  encoding  UTF-8   gt   lt beans xmlns  http   www springframework org schema beans      xmlns xsi  http   www w3 org 2001 XMLSchema-instance  xmlns context  http   www springframework org schema context      xmlns jee  http   www springframework org schema jee      xsi schemaLocation  http   www springframework org schema beans          http   www springframework org schema beans spring-beans-3 0 xsd          http   www springframework org schema context          http   www springframework org schema context spring-context-3 0 xsd           http   www springframework org schema jee http   www springframework org schema jee spring-jee-3 0 xsd  gt        lt context component-scan         base-package  controllers services dao org springframework jndi    gt   lt  beans gt    ServiceImpl java   org springframework stereotype Service public class ServiceImpl implements MyService         Autowired     private MyDAO myDAO       public void getData                 ServiceImplTest java   RunWith SpringJUnit4ClassRunner class   ContextConfiguration  classpath  conf components xml   public class ServiceImplTest        Test     public void testMyFunction             Error   16 22 48 753  main  ERROR o s test context TestContextManager - Caught exception while allowing TestExecutionListener  org springframework test context support DependencyInjectionTestExecutionListener 2092dcdb  to prepare test instance  services ServiceImplTest 9e1be92  org springframework beans factory BeanCreationException  Error creating bean with name  services ServiceImplTest   Injection of autowired dependencies failed  nested exception is org springframework beans factory BeanCreationException  Could not autowire field  private services ServiceImpl services ServiceImplTest publishedServiceImpl  nested exception is org springframework beans factory NoSuchBeanDefinitionException  No matching bean of type  services ServiceImpl  found for dependency  expected at least 1 bean which qualifies as autowire candidate for this dependency  Dependency annotations    org springframework beans factory annotation Autowired required true       at org springframework beans factory annotation AutowiredAnnotationBeanPostProcessor postProcessPropertyValues AutowiredAnnotationBeanPostProcessor java 287    spring-beans jar 3 1 2 RELEASE

User · Answer

I think somewhere in your codebase are you  Autowiring the concrete class ServiceImpl where you should be autowiring it s interface  presumably MyService

User · Answer

I ve done it with two annotations for test class   RunWith SpringRunner class  and  SpringBootTest  Example   RunWith SpringRunner class    SpringBootTest public class ProtocolTransactionServiceTest         Autowired     private ProtocolTransactionService protocolTransactionService      SpringBootTest loads the whole context  which was OK in my case

User · Answer

A JUnit4 test with Autowired and bean mocking  Mockito      JUnit starts spring context  RunWith SpringRunner class     spring load context configuration from AppConfig class  ContextConfiguration classes   AppConfig class     overriding some properties with test values if you need  TestPropertySource properties              quot spring someConfigValue your-test-value quot      public class PersonServiceTest         MockBean     private PersonRepository repository        Autowired     private PersonService personService     uses PersonRepository           Test     public void testSomething                using Mockito         when repository findByName any     thenReturn Collection emptyList             Person person   new Person            person setName null               when         boolean found   personService checkSomething person               then         assertTrue found   quot Something is wrong quot

User · Answer

In Spring 2 1 5 at least  the XML file can be conveniently replaced by annotations  Piggy backing on  Sembrano s answer  I have this   quot Look ma  no XML quot   It appears I to had list all the classes I need  Autowired in the  ComponentScan  RunWith SpringJUnit4ClassRunner class   ComponentScan      basePackageClasses                 OwnerService class                 EnableAutoConfiguration public class OwnerIntegrationTest             Autowired     OwnerService ownerService            Test     public void testOwnerService            Assert assertNotNull ownerService

User · Answer

Make sure you have imported the correct package  If I remeber correctly there are two different packages for Autowiring  Should be  org springframework beans factory annotation Autowired   Also this looks wierd to me     ContextConfiguration  classpath  conf components xml     Here is an example that works fine for me      RunWith SpringJUnit4ClassRunner class   ContextConfiguration locations       applicationContext mock xml     public class OwnerIntegrationTest         Autowired     OwnerService ownerService        Before     public void setup              ownerService cleanList                 Test     public void testOwners              Owner owner   new Owner  Bengt    Karlsson    Ankav  gen 3            owner   ownerService createOwner owner           assertEquals  Check firstName       Bengt   owner getFirstName             assertTrue  Check that Id exist     owner getId    gt  0            owner setLastName  Larsson            ownerService updateOwner owner           owner   ownerService getOwner owner getId             assertEquals  Name is changed    Larsson   owner getLastName

User · Answer

You should make another XML-spring configuration file in your test resource folder or just copy the old one  it looks fine  but if you re trying to start a web context for testing a micro service  just put the following code as your master test class and inherits from that    WebAppConfiguration  RunWith SpringRunner class   ContextConfiguration locations    classpath  spring-test-config xml   public abstract class AbstractRestTest        Autowired     private WebApplicationContext wac

[java] How to write JUnit test with Spring Autowire?

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