Fix afterAll test to use mocked ExtensionContext

The afterAll lifecycle callback requires a valid ExtensionContext to
determine if cleanup should occur at the top level. The test was
previously passing null, causing NPE after the nested class handling
logic was added.

Author: ps-mir

sdk/testing/src/main/java/io/opentelemetry/sdk/testing/junit5/OpenTelemetryExtension.java

@@ -196,6 +196,8 @@ public void beforeAll(ExtensionContext context) {
   @Override
   public void afterAll(ExtensionContext context) {
     GlobalOpenTelemetry.resetForTest();
-    openTelemetry.close();
+    if (context.getParent().isPresent() && !context.getParent().get().getTestClass().isPresent()) {
+      openTelemetry.close();
+    }
   }
 }

sdk/testing/src/test/java/io/opentelemetry/sdk/testing/junit5/OpenTelemetryExtensionTest.java

@@ -7,6 +7,8 @@
 
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
 
 import io.opentelemetry.api.GlobalOpenTelemetry;
 import io.opentelemetry.api.OpenTelemetry;
@@ -27,8 +29,10 @@
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
+import java.util.Optional;
 import javax.annotation.Nullable;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtensionContext;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
 class OpenTelemetryExtensionTest {
@@ -219,7 +223,15 @@ public void getLogRecordsAgain() {
   void afterAll() {
     // Use a different instance of OpenTelemetryExtension to avoid interfering with other tests
     OpenTelemetryExtension extension = OpenTelemetryExtension.create();
-    extension.beforeAll(null);
+
+    ExtensionContext parentContext = spy(ExtensionContext.class);
+    when(parentContext.getTestClass()).thenReturn(Optional.empty());
+    
+    ExtensionContext context = spy(ExtensionContext.class);
+    when(context.getParent()).thenReturn(Optional.of(parentContext));
+
+
+    extension.beforeAll(context);
 
     Meter meter = extension.getOpenTelemetry().getMeter("meter");
     Tracer tracer = extension.getOpenTelemetry().getTracer("tracer");
@@ -229,7 +241,7 @@ void afterAll() {
     assertThat(extension.getMetrics()).isNotEmpty();
     assertThat(extension.getSpans()).isNotEmpty();
 
-    extension.afterAll(null);
+    extension.afterAll(context);
     assertThat(GlobalOpenTelemetry.get()).extracting("delegate").isSameAs(OpenTelemetry.noop());
 
     meter.counterBuilder("counter").build().add(10);