Get @ConfigurationProperties bean autowired in Junit

Question

enter code hereI have a class annotated with @ConfigurationProperties in spring boot, how can I get this bean autowired in Junit tests

@ConfigurationProperties
 public class ConfigClass{
   public String property;
}

--Now under Test--

@RunWith(MockitoJunitRuner.class)
 class MyTests{

 @Autowired
 private ConfigClass configClass;

 @Test
 public myTest1(){
   String prop = configClass.getProperty();
   //Some assert
 }

-- configClass is coming out as null when I run this test --

Answer 1

testing springboot with jUnit you can use @RunWith(SpringRunner.class) or @SpringbootTest which loads the entire context

if you want to test your config specifically use @TestConfiguration annotation. There are two ways of using the annotation Either on a static inner class in the same test class where we want to @Autowire the bean or create a separate test configuration class:

i will pick the first option inside static class

see example below,

@ConfigurationProperties
 public class ConfigClass{
   public String property;
}
--Now under Test--

@RunWith(MockitoJunitRuner.class)
 class MyTests{


 @Autowired
 private ConfigClass configClass;

**// here use the @TestConfiguration annotation not @Test**

 @TestConfiguration
 public myTest1(){
   String prop = configClass.getProperty();
   //Some assert
 }

//Ok this works, now there is another class like below which is part of the test, and the configClass is not getting autowired there, any ideas

NB: i suggest to use the second option which is having separate test configuration class to autowire all configurations across the classs like below

@TestConfiguration
public YourTestConfigurationClass ()
{
// plus all the other code which worked 

    @Component
    public class OtherClass{
 
      @Autowired
      private ConfigClass configClass;
   }
}