diff --git a/swh/journal/tests/utils.py b/swh/journal/tests/utils.py
index 01bbb51..0c08958 100644
--- a/swh/journal/tests/utils.py
+++ b/swh/journal/tests/utils.py
@@ -1,79 +1,80 @@
 from swh.journal.client import JournalClient
 from swh.journal.writer.kafka import KafkaJournalWriter
 from swh.journal.serializers import kafka_to_value, key_to_kafka, value_to_kafka
 
 
 class FakeKafkaMessage:
     def __init__(self, topic, key, value):
         self._topic = topic
         self._key = key_to_kafka(key)
         self._value = value_to_kafka(value)
 
     def topic(self):
         return self._topic
 
     def value(self):
         return self._value
 
     def key(self):
         return self._key
 
     def error(self):
         return None
 
 
 class MockedKafkaWriter(KafkaJournalWriter):
-    def __init__(self, queue):
+    def __init__(self, queue, anonymize: bool = False):
         self._prefix = "prefix"
         self.queue = queue
+        self.anonymize = anonymize
 
     def send(self, topic, key, value):
         msg = FakeKafkaMessage(topic=topic, key=key, value=value)
         self.queue.append(msg)
 
     def flush(self):
         pass
 
 
 class MockedKafkaConsumer:
     """Mimic the confluent_kafka.Consumer API, producing the messages stored
        in `queue`.
 
        You're only allowed to subscribe to topics in which the queue has
        messages.
     """
 
     def __init__(self, queue):
         self.queue = queue
         self.committed = False
 
     def consume(self, num_messages, timeout=None):
         L = self.queue[0:num_messages]
         self.queue[0:num_messages] = []
         return L
 
     def commit(self):
         if self.queue == []:
             self.committed = True
 
     def list_topics(self, timeout=None):
         return set(message.topic() for message in self.queue)
 
     def subscribe(self, topics):
         unknown_topics = set(topics) - self.list_topics()
         if unknown_topics:
             raise ValueError("Unknown topics %s" % ", ".join(unknown_topics))
 
     def close(self):
         pass
 
 
 class MockedJournalClient(JournalClient):
     def __init__(self, queue, object_types=None):
         self._object_types = object_types
         self.consumer = MockedKafkaConsumer(queue)
         self.process_timeout = None
         self.stop_after_objects = None
         self.value_deserializer = kafka_to_value
         self.stop_on_eof = False
         self.batch_size = 200