Update documentation to use JUnit Jupiter

See gh-17507

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -7023,9 +7023,8 @@ property:
 
 [source,java,indent=0]
 ----
-	@RunWith(SpringRunner.class)
 	@SpringBootTest(properties = "spring.main.web-application-type=reactive")
-	public class MyWebFluxTests { ... }
+	class MyWebFluxTests { ... }
 ----
 
 
@@ -7088,10 +7087,10 @@ that class explicitly where it is required, as shown in the following example:
 ----
 	@SpringBootTest
 	@Import(MyTestsConfiguration.class)
-	public class MyTests {
+	class MyTests {
 
 		@Test
-		public void exampleTest() {
+		void exampleTest() {
 			...
 		}
 
@@ -7345,7 +7344,7 @@ Strings respectively. Any helper fields on the test class can be `@Autowired` wh
 		}
 
 		@Test
-		public void testDeserialize() throws Exception {
+		void testDeserialize() throws Exception {
 			String content = "{\"make\":\"Ford\",\"model\":\"Focus\"}";
 			assertThat(this.json.parse(content))
 					.isEqualTo(new VehicleDetails("Ford", "Focus"));
@@ -7636,10 +7635,9 @@ following example:
 
 [source,java,indent=0]
 ----
-	@RunWith(SpringRunner.class)
 	@DataJpaTest
 	@AutoConfigureTestDatabase(replace=Replace.NONE)
-	public class ExampleRepositoryTests {
+	class ExampleRepositoryTests {
 
 		// ...
 
@@ -7765,7 +7763,7 @@ The following class shows the `@DataMongoTest` annotation in use:
 	import org.springframework.data.mongodb.core.MongoTemplate;
 
 	@DataMongoTest
-	public class ExampleDataMongoTests {
+	class ExampleDataMongoTests {
 
 		@Autowired
 		private MongoTemplate mongoTemplate;
@@ -7785,7 +7783,7 @@ the following example:
 	import org.springframework.boot.test.autoconfigure.data.mongo.DataMongoTest;
 
 	@DataMongoTest(excludeAutoConfiguration = EmbeddedMongoAutoConfiguration.class)
-	public class ExampleDataMongoNonEmbeddedTests {
+	class ExampleDataMongoNonEmbeddedTests {
 
 	}
 ----
@@ -7812,7 +7810,7 @@ The following example shows a typical setup for using Neo4J tests in Spring Boot
 	import org.springframework.boot.test.autoconfigure.data.neo4j.DataNeo4jTest;
 
 	@DataNeo4jTest
-	public class ExampleDataNeo4jTests {
+	class ExampleDataNeo4jTests {
 
 		@Autowired
 		private YourRepository repository;
@@ -7835,7 +7833,7 @@ as follows:
 
 	@DataNeo4jTest
 	@Transactional(propagation = Propagation.NOT_SUPPORTED)
-	public class ExampleNonTransactionalTests {
+	class ExampleNonTransactionalTests {
 
 	}
 ----
@@ -7861,7 +7859,7 @@ The following example shows the `@DataRedisTest` annotation in use:
 	import org.springframework.boot.test.autoconfigure.data.redis.DataRedisTest;
 
 	@DataRedisTest
-	public class ExampleDataRedisTests {
+	class ExampleDataRedisTests {
 
 		@Autowired
 		private YourRepository repository;
@@ -7892,7 +7890,7 @@ The following example shows the `@DataLdapTest` annotation in use:
 	import org.springframework.ldap.core.LdapTemplate;
 
 	@DataLdapTest
-	public class ExampleDataLdapTests {
+	class ExampleDataLdapTests {
 
 		@Autowired
 		private LdapTemplate ldapTemplate;
@@ -7912,7 +7910,7 @@ following example:
 	import org.springframework.boot.test.autoconfigure.data.ldap.DataLdapTest;
 
 	@DataLdapTest(excludeAutoConfiguration = EmbeddedLdapAutoConfiguration.class)
-	public class ExampleDataLdapNonEmbeddedTests {
+	class ExampleDataLdapNonEmbeddedTests {
 
 	}
 ----
@@ -7935,7 +7933,7 @@ The specific beans that you want to test should be specified by using the `value
 [source,java,indent=0]
 ----
 	@RestClientTest(RemoteVehicleDetailsService.class)
-	public class ExampleRestClientTest {
+	class ExampleRestClientTest {
 
 		@Autowired
 		private RemoteVehicleDetailsService service;
@@ -7944,7 +7942,7 @@ The specific beans that you want to test should be specified by using the `value
 		private MockRestServiceServer server;
 
 		@Test
-		public void getVehicleDetailsWhenResultIsSuccessShouldReturnDetails()
+		void getVehicleDetailsWhenResultIsSuccessShouldReturnDetails()
 				throws Exception {
 			this.server.expect(requestTo("/greet/details"))
 					.andRespond(withSuccess("hello", MediaType.TEXT_PLAIN));
@@ -8099,10 +8097,9 @@ simply by adding `@ImportAutoConfiguration` to the test as shown in the followin
 
 [source,java,indent=0]
 ----
-	@RunWith(SpringRunner.class)
 	@JdbcTest
 	@ImportAutoConfiguration(IntegrationAutoConfiguration.class)
-	public class ExampleJdbcTests {
+	class ExampleJdbcTests {
 
 	}
 ----

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/test/autoconfigure/restdocs/webclient/UsersDocumentationTests.java

@@ -18,20 +18,17 @@ package org.springframework.boot.docs.test.autoconfigure.restdocs.webclient;
 
 // tag::source[]
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.restdocs.AutoConfigureRestDocs;
 import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
 import org.springframework.test.web.reactive.server.WebTestClient;
 
 import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.document;
 
-@ExtendWith(SpringExtension.class)
 @WebFluxTest
 @AutoConfigureRestDocs
-public class UsersDocumentationTests {
+class UsersDocumentationTests {
 
 	@Autowired
 	private WebTestClient webTestClient;

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/test/web/MockMvcExampleTests.java

@@ -20,6 +20,7 @@ package org.springframework.boot.docs.test.web;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.web.servlet.MockMvc;
@@ -33,7 +34,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 class MockMvcExampleTests {
 
 	@Test
-	void exampleTest(MockMvc mvc) throws Exception {
+	void exampleTest(@Autowired MockMvc mvc) throws Exception {
 		mvc.perform(get("/")).andExpect(status().isOk()).andExpect(content().string("Hello World"));
 	}
 

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/test/web/RandomPortWebTestClientExampleTests.java

@@ -26,7 +26,7 @@ import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.test.web.reactive.server.WebTestClient;
 
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
-public class RandomPortWebTestClientExampleTests {
+class RandomPortWebTestClientExampleTests {
 
 	@Test
 	void exampleTest(@Autowired WebTestClient webClient) {

spring-boot-project/spring-boot-docs/src/test/java/org/springframework/boot/docs/web/client/SampleWebClientTests.java

@@ -19,7 +19,6 @@ package org.springframework.boot.docs.web.client;
 import java.time.Duration;
 
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
@@ -29,7 +28,6 @@ import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.http.HttpHeaders;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -39,7 +37,6 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Stephane Nicoll
  */
 // tag::test[]
-@ExtendWith(SpringExtension.class)
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
 class SampleWebClientTests {