@Test
    public void testUnauthorizedTopic() {
        buildFetcher();

        assignFromUser(singleton(tp0));
        subscriptions.seek(tp0, 0);

        assertEquals(1, sendFetches());
        client.prepareResponse(fullFetchResponse(tidp0, records, Errors.TOPIC_AUTHORIZATION_FAILED, 100L, 0));
        consumerClient.poll(time.timer(0));
        try {
            collectFetch();
            fail("collectFetch should have thrown a TopicAuthorizationException");
        } catch (TopicAuthorizationException e) {
            assertEquals(singleton(topicName), e.unauthorizedTopics());
        }
    }
Test the case where the client makes a post KIP-74 FetchRequest, but the server replies with only a
partial request. For v3 and later FetchRequests, the implementation of KIP-74 changed the behavior
so that at least one message is always returned. Therefore, this case should not happen, and it indicates
that an internal error has taken place.
clients/src/test/java/org/apache/kafka/clients/consumer/internals/FetcherTest.java