Upgrade tests to Junit5

See gh-14737

spring-boot-samples/spring-boot-sample-data-jdbc/src/test/java/sample/data/jdbc/CustomerRepositoryIntegrationTests.java

@@ -15,13 +15,11 @@
  */
 package sample.data.jdbc;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -30,7 +28,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Andy Wilkinson
  */
-@RunWith(SpringRunner.class)
+
 @SpringBootTest
 @AutoConfigureTestDatabase
 public class CustomerRepositoryIntegrationTests {

spring-boot-samples/spring-boot-sample-data-jdbc/src/test/java/sample/data/jdbc/SampleDataJdbcApplicationTests.java

@@ -16,13 +16,11 @@
 
 package sample.data.jdbc;
 
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.web.context.WebApplicationContext;
@@ -37,7 +35,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  *
  * @author Andy Wilkinson
  */
-@RunWith(SpringRunner.class)
+
 @SpringBootTest
 public class SampleDataJdbcApplicationTests {
 
@@ -46,7 +44,7 @@ public class SampleDataJdbcApplicationTests {
 
 	private MockMvc mvc;
 
-	@Before
+	@BeforeEach
 	public void setUp() {
 		this.mvc = MockMvcBuilders.webAppContextSetup(this.context).build();
 	}