Support injecting into superclass of tests (#35084)

Closes #35082

Signed-off-by: stianst <stianst@gmail.com>

test-framework/core/src/main/java/org/keycloak/test/framework/injection/Registry.java

@@ -7,6 +7,7 @@ import org.keycloak.test.framework.config.Config;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedList;
@@ -136,7 +137,7 @@ public class Registry implements ExtensionContext.Store.CloseableResource {
             requestedInstances.add(requestedServerInstance);
         }
 
-        for (Field f : testClass.getDeclaredFields()) {
+        for (Field f : listFields(testClass)) {
             RequestedInstance requestedInstance = createRequestedInstance(f.getAnnotations(), f.getType());
             if (requestedInstance != null) {
                 requestedInstances.add(requestedInstance);
@@ -192,7 +193,7 @@ public class Registry implements ExtensionContext.Store.CloseableResource {
     }
 
     private void injectFields(Object testInstance) {
-        for (Field f : testInstance.getClass().getDeclaredFields()) {
+        for (Field f : listFields(testInstance.getClass())) {
             InstanceContext<?, ?> instance = getDeployedInstance(f.getType(), f.getAnnotations());
             if(instance == null) { // a test class might have fields not meant for injection
                 continue;
@@ -369,4 +370,16 @@ public class Registry implements ExtensionContext.Store.CloseableResource {
         }
     }
 
+    private List<Field> listFields(Class clazz) {
+        List<Field> fields = new LinkedList<>(Arrays.asList(clazz.getDeclaredFields()));
+
+        Class<?> superclass = clazz.getSuperclass();
+        while (superclass != null && !superclass.equals(Object.class)) {
+            fields.addAll(Arrays.asList(superclass.getDeclaredFields()));
+            superclass = superclass.getSuperclass();
+        }
+
+        return fields;
+    }
+
 }

test-framework/examples/tests/src/test/java/org/keycloak/test/examples/AbstractTest.java

@@ -0,0 +1,11 @@
+package org.keycloak.test.examples;
+
+import org.keycloak.test.framework.annotations.InjectRealm;
+import org.keycloak.test.framework.realm.ManagedRealm;
+
+public abstract class AbstractTest {
+
+    @InjectRealm
+    ManagedRealm realm;
+
+}

test-framework/examples/tests/src/test/java/org/keycloak/test/examples/InjectIntoAbstractFieldsTest.java

@@ -0,0 +1,15 @@
+package org.keycloak.test.examples;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.keycloak.test.framework.annotations.KeycloakIntegrationTest;
+
+@KeycloakIntegrationTest
+public class InjectIntoAbstractFieldsTest extends AbstractTest {
+
+    @Test
+    public void testManagedRealm() {
+        Assertions.assertNotNull(realm);
+    }
+
+}