@Test
    public void testClientDisconnectAfterInternalApiVersionRequest() throws Exception {
        awaitInFlightApiVersionRequest();
        client.disconnect(node.idString());
        assertFalse(client.hasInFlightRequests(node.idString()));

        // The failed ApiVersion request should not be forwarded to upper layers
        List<ClientResponse> responses = client.poll(0, time.milliseconds());
        assertTrue(responses.isEmpty());
    }
This is a helper method that will execute two produce calls. The first call is expected to work and the
second produce call is intentionally made to emulate a request timeout. In the case that a timeout occurs
during a request, we want to ensure that we {@link Metadata#requestUpdate() request a metadata update} so that
on a subsequent invocation of {@link NetworkClient#poll(long, long) poll}, the metadata request will be sent.

<p/>

The {@link MetadataUpdater} has a specific method to handle
{@link NetworkClient.DefaultMetadataUpdater#handleServerDisconnect(long, String, Optional) server disconnects}
which is where we {@link Metadata#requestUpdate() request a metadata update}. This test helper method ensures
that is invoked by checking {@link Metadata#updateRequested()} after the simulated timeout.

@param requestTimeoutMs Timeout in ms
clients/src/test/java/org/apache/kafka/clients/NetworkClientTest.java