Moving to Junit5 for the most of the project, since Spring Boot 2.4.x is now based on it. But we have to include vintage-engine also for the TestContainers DockerCompose module, since without the ClassRule (which is bound to Junit 4) the test is not running, because containers aren't spun up correctly...

Author: jonashackt

client-bob/src/test/java/de/jonashackt/BobTest.java

@@ -1,18 +1,14 @@
 package de.jonashackt;
 
-import org.junit.Ignore;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.beans.factory.annotation.Autowired;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.web.server.LocalServerPort;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.web.client.RestTemplate;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.containsString;
-import static org.junit.Assert.assertThat;
 
-@RunWith(SpringRunner.class)
 @SpringBootTest(
 		classes = BobApplication.class,
 		webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT
@@ -22,10 +18,9 @@ public class BobTest {
 	@LocalServerPort
 	private int port;
 
-	@Autowired
-    private RestTemplate restTemplate;
+    private RestTemplate restTemplate = new RestTemplate();
 
-	@Ignore("no localhost support, because without Docker we would need to bind the same Port 8443 of server-alice and server-tom two times, which isn´t possible")
+	@Disabled("no localhost support, because without Docker we would need to bind the same Port 8443 of server-alice and server-tom two times, which isn´t possible")
 	@Test
 	public void is_hello_resource_callable_with_client_cert() {
 		String response = restTemplate.getForObject("https://localhost:" + port + "/secretservers", String.class);

docker-network-client/pom.xml

@@ -47,6 +47,15 @@
 			<scope>test</scope>
 		</dependency>
 
+		<!-- Needed to run TestContainers in using the DockerCompose module https://www.testcontainers.org/modules/docker_compose/
+		but together with a Spring Boot 2.4.x based project, which uses JUnit 5 - but Testcontainers ClassRule for Docker Compose
+		is bound to Junit4 currently -->
+		<dependency>
+			<groupId>org.junit.vintage</groupId>
+			<artifactId>junit-vintage-engine</artifactId>
+			<scope>test</scope>
+		</dependency>
+
 	</dependencies>
 
 </project>

docker-network-client/src/test/resources/testcontainers.properties

@@ -1,17 +1,16 @@
 package de.jonashackt;
 
 import de.jonashackt.controller.ServerAliceController;
-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;
 import org.springframework.boot.web.server.LocalServerPort;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.web.client.RestTemplate;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 
-@RunWith(SpringRunner.class)
 @SpringBootTest(
 		classes = ServerAliceApplication.class,
 		webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT

server-alice/src/test/java/de/jonashackt/RestClientCertTest.java

@@ -1,17 +1,17 @@
 package de.jonashackt;
 
 import de.jonashackt.controller.ServerTomController;
-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;
 import org.springframework.boot.web.server.LocalServerPort;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.web.client.RestTemplate;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 
-@RunWith(SpringRunner.class)
 @SpringBootTest(
 		classes = ServerTomApplication.class,
 		webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT