fix(extensions): inject ZPT fields into superclasses

The extensions should inject the engine, client and recordstream into the fields that are available. Before this only tried to inject them into the annotated class. This does not work when inheritance is used and the fields are defined on the superclass of the annotated class.

This commit changes the extension so that it will first look on the annotated class. If it cannot find any of the annotations here, it will work it's way up to the superclass and so on until it either found a field it is able to inject, or no fields at all.

extension-testcontainer/src/main/java/io.camunda.zeebe.process.test.extension.testcontainer/ZeebeProcessTestExtension.java

@@ -123,14 +123,15 @@ public void testFailed(final ExtensionContext extensionContext, final Throwable
 
   private void injectFields(final ExtensionContext extensionContext, final Object... objects) {
     final Class<?> requiredTestClass = extensionContext.getRequiredTestClass();
-    final Field[] declaredFields = requiredTestClass.getDeclaredFields();
     for (final Object object : objects) {
-      final Optional<Field> field = getField(declaredFields, object);
+      final Optional<Field> field = getField(requiredTestClass, object);
       field.ifPresent(value -> injectField(extensionContext, value, object));
     }
   }
 
-  private Optional<Field> getField(final Field[] declaredFields, final Object object) {
+  private Optional<Field> getField(final Class<?> requiredTestClass, final Object object) {
+    final Field[] declaredFields = requiredTestClass.getDeclaredFields();
+
     final List<Field> fields =
         Arrays.stream(declaredFields)
             .filter(field -> field.getType().isInstance(object))
@@ -143,8 +144,12 @@ private Optional<Field> getField(final Field[] declaredFields, final Object obje
                   + "found %s. Please make sure at most one field of type %s has been declared in the"
                   + " test class.",
               object.getClass().getSimpleName(), fields.size(), object.getClass().getSimpleName()));
+    } else if (fields.size() == 0) {
+      final Class<?> superclass = requiredTestClass.getSuperclass();
+      return superclass == null ? Optional.empty() : getField(superclass, object);
+    } else {
+      return Optional.of(fields.get(0));
     }
-    return fields.size() == 0 ? Optional.empty() : Optional.of(fields.get(0));
   }
 
   private void injectField(

extension/src/main/java/io/camunda/zeebe/process/test/extension/ZeebeProcessTestExtension.java

@@ -99,14 +99,15 @@ public void testFailed(final ExtensionContext extensionContext, final Throwable
 
   private void injectFields(final ExtensionContext extensionContext, final Object... objects) {
     final Class<?> requiredTestClass = extensionContext.getRequiredTestClass();
-    final Field[] declaredFields = requiredTestClass.getDeclaredFields();
     for (final Object object : objects) {
-      final Optional<Field> field = getField(declaredFields, object);
+      final Optional<Field> field = getField(requiredTestClass, object);
       field.ifPresent(value -> injectField(extensionContext, value, object));
     }
   }
 
-  private Optional<Field> getField(final Field[] declaredFields, final Object object) {
+  private Optional<Field> getField(final Class<?> requiredTestClass, final Object object) {
+    final Field[] declaredFields = requiredTestClass.getDeclaredFields();
+
     final List<Field> fields =
         Arrays.stream(declaredFields)
             .filter(field -> field.getType().isInstance(object))
@@ -119,8 +120,12 @@ private Optional<Field> getField(final Field[] declaredFields, final Object obje
                   + "found %s. Please make sure at most one field of type %s has been declared in the"
                   + " test class.",
               object.getClass().getSimpleName(), fields.size(), object.getClass().getSimpleName()));
+    } else if (fields.size() == 0) {
+      final Class<?> superclass = requiredTestClass.getSuperclass();
+      return superclass == null ? Optional.empty() : getField(superclass, object);
+    } else {
+      return Optional.of(fields.get(0));
     }
-    return fields.size() == 0 ? Optional.empty() : Optional.of(fields.get(0));
   }
 
   private void injectField(