Adopt Spring Java Format's JUnit 5 check

Closes gh-941

initializr-actuator/src/test/java/io/spring/initializr/actuate/stat/MainControllerStatsIntegrationTests.java

@@ -56,7 +56,7 @@ class MainControllerStatsIntegrationTests extends AbstractFullStackInitializrInt
 	private ProjectGenerationStatPublisher projectGenerationStatPublisher;
 
 	@BeforeEach
-	public void setup() {
+	void setup() {
 		this.statsMockController.stats.clear();
 		// Make sure our mock is going to be invoked with the stats
 		this.projectGenerationStatPublisher

initializr-actuator/src/test/java/io/spring/initializr/actuate/stat/ProjectGenerationStatPublisherTests.java

@@ -76,7 +76,7 @@ class ProjectGenerationStatPublisherTests {
 	private MockRestServiceServer mockServer;
 
 	@BeforeEach
-	public void setUp() {
+	void setUp() {
 		configureService(createProperties());
 	}
 

initializr-docs/pom.xml

@@ -48,6 +48,11 @@
 			<optional>true</optional>
 		</dependency>
 
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>

initializr-docs/src/main/asciidoc/using-the-stubs.adoc

@@ -31,15 +31,14 @@ A convenient way to consume the stubs in your project is to add a test dependenc
 
 and then pull the stubs from the classpath. In a Spring Boot application, using
 Spring Cloud Contract, you can start a WireMock server and register all the stubs
-with it like this:
+with it, as shown in the following JUnit 5-based example:
 
 [source,java,indent=0,subs="attributes"]
 ----
-	@RunWith(SpringRunner.class)
 	@SpringBootTest
 	@AutoConfigureWireMock(port = 0,
 		stubs="classpath:META-INF/io.spring.initializr/initializr-web/{spring-initializr-version}")
-	public class ClientApplicationTests {
+	class ClientApplicationTests {
 
 		@Value("${wiremock.server.port}")
 		private int port;
@@ -80,16 +79,16 @@ stubs declared as a dependency):
 	</dependency>
 ----
 
-The test should use `@AutoConfigureStubRunner` instead:
+The test should use `@AutoConfigureStubRunner` instead, as shown in the following JUnit
+5-based example:
 
 [source,java,indent=0,,subs="attributes,specialchars"]
 ----
-	@RunWith(SpringRunner.class)
 	@SpringBootTest(webEnvironment = WebEnvironment.NONE)
 	@AutoConfigureStubRunner(
 		ids = "io.spring.initializr:initializr-web:{spring-initializr-version}",
 		repositoryRoot = "https://repo.spring.io/{initializr-repo}")
-	public class ClientApplicationTests {
+	class ClientApplicationTests {
 
 		@Autowired
 		private StubFinder stubFinder;
@@ -100,9 +99,9 @@ The test should use `@AutoConfigureStubRunner` instead:
 	}
 ----
 
-Here is an example of a test that retrieves the metadata of the service. The assertions
-do not matter much here but it illustrates how you could integrate that in the test suite
-of a custom client:
+Here is JUnit 5-based example of a test that retrieves the metadata of the service. The
+assertions do not matter much here but it illustrates how you could integrate that in the
+test suite of a custom client:
 
 [source,java,indent=0,subs="verbatim,quotes,attributes"]
 ----

initializr-docs/src/test/java/io/spring/initializr/stub/ClientApplicationTests.java

@@ -18,8 +18,7 @@ package io.spring.initializr.stub;
 
 import java.net.URI;
 
-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.context.SpringBootTest;
@@ -34,16 +33,14 @@ import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.RequestEntity;
 import org.springframework.http.ResponseEntity;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.web.client.RestTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-@RunWith(SpringRunner.class)
+// tag::test[]
 @SpringBootTest(webEnvironment = WebEnvironment.NONE)
 @AutoConfigureStubRunner(ids = "io.spring.initializr:initializr-web:${project.version}", stubsMode = StubsMode.LOCAL)
-// tag::test[]
-public class ClientApplicationTests {
+class ClientApplicationTests {
 
 	@Autowired
 	private StubFinder stubFinder;
@@ -52,7 +49,7 @@ public class ClientApplicationTests {
 	private RestTemplate restTemplate;
 
 	@Test
-	public void testCurrentMetadata() {
+	void testCurrentMetadata() {
 		RequestEntity<Void> request = RequestEntity.get(createUri("/"))
 				.accept(MediaType.valueOf("application/vnd.initializr.v2.1+json")).build();
 

initializr-web/src/test/java/io/spring/initializr/web/AbstractInitializrIntegrationTests.java

@@ -77,7 +77,7 @@ public abstract class AbstractInitializrIntegrationTests {
 	private RestTemplate restTemplate;
 
 	@BeforeEach
-	public void before(@TempDir Path folder) {
+	void before(@TempDir Path folder) {
 		this.restTemplate = this.restTemplateBuilder.build();
 		this.folder = folder;
 	}

initializr-web/src/test/java/io/spring/initializr/web/project/MainControllerIntegrationTests.java

@@ -169,7 +169,7 @@ class MainControllerIntegrationTests extends AbstractInitializrControllerIntegra
 
 	@Test
 	@Disabled("Need a comparator that does not care about the number of elements in an array")
-	public void currentMetadataCompatibleWithV2() {
+	void currentMetadataCompatibleWithV2() {
 		ResponseEntity<String> response = invokeHome(null, "*/*");
 		validateMetadata(response, AbstractInitializrIntegrationTests.CURRENT_METADATA_MEDIA_TYPE, "2.0.0",
 				JSONCompareMode.LENIENT);
@@ -237,7 +237,7 @@ class MainControllerIntegrationTests extends AbstractInitializrControllerIntegra
 
 	@Test
 	// make sure curl can still receive metadata with json
-	public void curlWithAcceptHeaderJson() {
+	void curlWithAcceptHeaderJson() {
 		ResponseEntity<String> response = invokeHome("curl/1.2.4", "application/json");
 		validateContentType(response, AbstractInitializrIntegrationTests.CURRENT_METADATA_MEDIA_TYPE);
 		validateCurrentMetadata(response.getBody());
@@ -263,7 +263,7 @@ class MainControllerIntegrationTests extends AbstractInitializrControllerIntegra
 
 	@Test
 	// make sure curl can still receive metadata with json
-	public void httpieWithAcceptHeaderJson() {
+	void httpieWithAcceptHeaderJson() {
 		ResponseEntity<String> response = invokeHome("HTTPie/0.8.0", "application/json");
 		validateContentType(response, AbstractInitializrIntegrationTests.CURRENT_METADATA_MEDIA_TYPE);
 		validateCurrentMetadata(response.getBody());
@@ -296,7 +296,7 @@ class MainControllerIntegrationTests extends AbstractInitializrControllerIntegra
 
 	@Test
 	// Test that the current output is exactly what we expect
-	public void validateCurrentProjectMetadata() {
+	void validateCurrentProjectMetadata() {
 		validateCurrentMetadata(getMetadataJson());
 	}
 

initializr-web/src/test/java/io/spring/initializr/web/support/CommandLineHelpGeneratorTests.java

@@ -39,7 +39,7 @@ class CommandLineHelpGeneratorTests {
 	private CommandLineHelpGenerator generator;
 
 	@BeforeEach
-	public void init() {
+	void init() {
 		this.generator = new CommandLineHelpGenerator(new MustacheTemplateRenderer("classpath:/templates"));
 	}
 

initializr-web/src/test/java/io/spring/initializr/web/support/DefaultInitializrMetadataUpdateStrategyTests.java

@@ -52,7 +52,7 @@ class DefaultInitializrMetadataUpdateStrategyTests {
 	private MockRestServiceServer mockServer;
 
 	@BeforeEach
-	public void setUp() {
+	void setUp() {
 		this.restTemplate = new RestTemplate();
 		this.mockServer = MockRestServiceServer.createServer(this.restTemplate);
 	}

src/checkstyle/checkstyle.xml

@@ -5,8 +5,7 @@
 <module name="com.puppycrawl.tools.checkstyle.Checker">
 	<module name="io.spring.javaformat.checkstyle.SpringChecks"/>
 	<module name="com.puppycrawl.tools.checkstyle.TreeWalker">
-		<module
-				name="com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck">
+		<module name="com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck">
 			<property name="file"
 					  value="${main.basedir}/src/checkstyle/import-control.xml"/>
 			<property name="path" value="^.*[\\/]src[\\/]main[\\/].*$"/>
@@ -19,5 +18,6 @@
 					  value="Please use BDDMockito imports."/>
 			<property name="ignoreComments" value="true"/>
 		</module>
+		<module name="io.spring.javaformat.checkstyle.check.SpringJUnit5Check"/>
 	</module>
 </module>