How to inject certain properties values during junit to a specific test

Question

My Spring Boot app has some test that are reading their properties from the application.yml that is in the test folder.

cat:
  maxAge:30
  maxNameSize:10

all is working fine, but I like that in certain tests, other values will be injected:

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = {
    Cat.class
})
@SpringBootTest
public class CatTest {

   @Test
   public void testX(){
     //inject maxAge=90
     // use maxNameSize from the application.yml
     ....

   @Test
   public void testZ(){
     //inject maxNameSize=5 
     // use maxAge from the application.yml
     ....
}

Answer 1

Changing properties on method level is not supported by Spring at this moment.

You can use nested classes to accomplish this.

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = {
    Cat.class
})
@SpringBootTest
public class CatTest {

    @Nested
    @SpringBootTest(properties = "cat.maxAge=90")
    public class NestedTestX {
    
        @Test
        void testX() {
            //noop
        }
    }

    @Nested
    @SpringBootTest(properties = "cat.maxNameSize=5")
    public class NestedTestZ {

        @Test
        void testZ() {
            //noop
        }
    }

}