Move K3s tests to JUnit Jupiter (#10741)

Author: eddumelendez

modules/k3s/build.gradle

@@ -6,7 +6,14 @@ dependencies {
     // Synchronize with the jackson version, must match major and minor version
     shaded 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.18.4'
 
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.11.0'
+
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.13.4'
     testImplementation 'io.fabric8:kubernetes-client:7.3.1'
     testImplementation 'io.kubernetes:client-java:24.0.0-legacy'
     testImplementation 'org.assertj:assertj-core:3.27.4'
 }
+
+test {
+    useJUnitPlatform()
+}

modules/k3s/src/test/java/org/testcontainers/k3s/Fabric8K3sContainerTest.java

@@ -12,7 +12,7 @@
 import io.fabric8.kubernetes.client.DefaultKubernetesClient;
 import io.fabric8.kubernetes.client.dsl.Resource;
 import lombok.extern.slf4j.Slf4j;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.testcontainers.containers.output.Slf4jLogConsumer;
 import org.testcontainers.utility.DockerImageName;
 
@@ -22,10 +22,10 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 @Slf4j
-public class Fabric8K3sContainerTest {
+class Fabric8K3sContainerTest {
 
     @Test
-    public void shouldStartAndHaveListableNode() {
+    void shouldStartAndHaveListableNode() {
         try (
             // starting_k3s {
             K3sContainer k3s = new K3sContainer(DockerImageName.parse("rancher/k3s:v1.21.3-k3s1"))

modules/k3s/src/test/java/org/testcontainers/k3s/KubectlContainerTest.java

@@ -1,7 +1,8 @@
 package org.testcontainers.k3s;
 
-import org.junit.ClassRule;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.Network;
 import org.testcontainers.containers.startupcheck.OneShotStartupCheckStrategy;
@@ -11,16 +12,26 @@
 import java.time.Duration;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-public class KubectlContainerTest {
+class KubectlContainerTest {
 
-    public static Network network = Network.SHARED;
+    private static final Network network = Network.SHARED;
 
-    @ClassRule
-    public static K3sContainer k3s = new K3sContainer(DockerImageName.parse("rancher/k3s:v1.21.3-k3s1"))
+    private static final K3sContainer k3s = new K3sContainer(DockerImageName.parse("rancher/k3s:v1.21.3-k3s1"))
         .withNetwork(network)
         .withNetworkAliases("k3s");
 
+    @BeforeAll
+    static void setup() {
+        k3s.start();
+    }
+
+    @AfterAll
+    static void teardown() {
+        k3s.stop();
+    }
+
     @Test
     public void shouldExposeKubeConfigForNetworkAlias() throws Exception {
         String kubeConfigYaml = k3s.generateInternalKubeConfigYaml("k3s");
@@ -38,8 +49,9 @@ public void shouldExposeKubeConfigForNetworkAlias() throws Exception {
         }
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test
     public void shouldThrowAnExceptionForUnknownNetworkAlias() {
-        k3s.generateInternalKubeConfigYaml("not-set-network-alias");
+        assertThatThrownBy(() -> k3s.generateInternalKubeConfigYaml("not-set-network-alias"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 }