Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.example.repository.ExampleRepository]: Specified class is an interface
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:77)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1311)
	... 39 more

From this:

   @SpyBean
   private ExampleRepository<ExampleData> exampleRepository;
   
to this:

   @SpyBean
   private ExampleRepository exampleRepository;