Switch to manual mocking instead of using Mockito annotation.

Closes #2409

spring-data-rest-tests/spring-data-rest-tests-jpa/src/test/java/org/springframework/data/rest/webmvc/RepositoryPropertyReferenceControllerIntegrationTests.java

@@ -16,13 +16,12 @@
 package org.springframework.data.rest.webmvc;
 
 import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Answers;
-import org.mockito.Mock;
-import org.mockito.junit.jupiter.MockitoExtension;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.rest.tests.AbstractControllerIntegrationTests;
 import org.springframework.data.rest.webmvc.jpa.Book;
@@ -36,7 +35,6 @@
 /**
  * @author Oliver Gierke
  */
-@ExtendWith(MockitoExtension.class)
 @ContextConfiguration(classes = JpaRepositoryConfig.class)
 @Transactional
 class RepositoryPropertyReferenceControllerIntegrationTests extends AbstractControllerIntegrationTests {
@@ -45,7 +43,8 @@ class RepositoryPropertyReferenceControllerIntegrationTests extends AbstractCont
  @Autowired TestDataPopulator populator;
  @Autowired BookRepository books;
 
- @Mock(answer = Answers.RETURNS_MOCKS) RepresentationModelAssemblers assembler;
+ RepresentationModelAssemblers assembler = mock(RepresentationModelAssemblers.class,
+ withSettings().defaultAnswer(Answers.RETURNS_MOCKS));
  RootResourceInformation information;
 
  @BeforeEach