Testcontainers/Java: Adjust software tests for common base class use

The right choice is to use JUnit 5.

https://testcontainers.com/guides/testcontainers-container-lifecycle/#_using_singleton_containers

Author: amotl

testing/testcontainers/java/build.gradle

@@ -25,6 +25,7 @@ dependencies {
     implementation 'org.slf4j:slf4j-api:2.0.17'
     implementation 'org.slf4j:slf4j-simple:2.0.17'
     testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.8.1'
     testImplementation "org.assertj:assertj-core:3.27.6"
     testImplementation 'org.testcontainers:testcontainers:2.0.1'
     testImplementation 'org.testcontainers:testcontainers-cratedb:2.0.1'

testing/testcontainers/java/src/test/java/io/crate/example/testing/TestClassScope.java

@@ -1,8 +1,7 @@
 package io.crate.example.testing;
 
 import io.crate.example.testing.utils.TestingHelpers;
-import org.junit.ClassRule;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.testcontainers.cratedb.CrateDBContainer;
 
 import java.io.IOException;
@@ -25,7 +24,6 @@
  */
 public class TestClassScope {
 
-    @ClassRule
     public static CrateDBContainer cratedb = new CrateDBContainer(TestingHelpers.nameFromLabel("5.10"));
 
     @Test

testing/testcontainers/java/src/test/java/io/crate/example/testing/TestFunctionScope.java

@@ -1,8 +1,7 @@
 package io.crate.example.testing;
 
 import io.crate.example.testing.utils.TestingHelpers;
-import org.junit.Rule;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.testcontainers.cratedb.CrateDBContainer;
 
 import java.io.IOException;
@@ -25,7 +24,6 @@
  */
 public class TestFunctionScope {
 
-    @Rule
     public CrateDBContainer cratedb = new CrateDBContainer(TestingHelpers.nameFromLabel("5.10"));
 
     @Test