Allow @testcontainers to be inherited from superclass (#1843) (#2001)

* Updated existing test with now expected behaviour
* @testcontainers is now @inherited

modules/junit-jupiter/src/main/java/org/testcontainers/junit/jupiter/Testcontainers.java

@@ -3,6 +3,7 @@
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
@@ -18,6 +19,10 @@
  * last test method has executed. Containers declared as instance fields will
  * be started and stopped for every test method.</p>
  *
+ * <p>The annotation {@code @Testcontainers} can be used on a superclass in
+ * the test hierarchy as well. All subclasses will automatically inherit
+ * support for the extension.</p>
+ *
  * <p><strong>Note:</strong> This extension has only be tested with sequential
  * test execution. Using it with parallel test execution is unsupported and
  * may have unintended side effects.</p>
@@ -52,6 +57,7 @@
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 @ExtendWith(TestcontainersExtension.class)
+@Inherited
 public @interface Testcontainers {
 
     /**

modules/junit-jupiter/src/test/java/org/testcontainers/junit/jupiter/inheritance/AbstractTestBase.java

@@ -3,8 +3,6 @@
 import org.testcontainers.junit.jupiter.Container;
 import org.testcontainers.junit.jupiter.Testcontainers;
 
-import java.util.concurrent.atomic.AtomicLong;
-
 @Testcontainers
 abstract class AbstractTestBase {
 

modules/junit-jupiter/src/test/java/org/testcontainers/junit/jupiter/inheritance/InheritedTests.java

@@ -6,7 +6,6 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-@Testcontainers
 class InheritedTests extends AbstractTestBase {
 
     @Container