@Test
    public void testTopiPartitionSerializationCompatibility() throws IOException, ClassNotFoundException {
        // assert serialized TopicPartition object in file (serializedData/topicPartitionSerializedfile) is
        // deserializable into TopicPartition and is compatible
        Object deserializedObject = Serializer.deserialize("serializedData/topicPartitionSerializedfile");
        assertInstanceOf(TopicPartition.class, deserializedObject);
        checkValues((TopicPartition) deserializedObject);
    }
This test ensures TopicPartition class is serializable and is serialization compatible.
Note: this ensures that the current code can deserialize data serialized with older versions of the code, but not the reverse.
That is, older code won't necessarily be able to deserialize data serialized with newer code.
clients/src/test/java/org/apache/kafka/common/TopicPartitionTest.java