@Test
    public void testConnectionDelayDisconnectedWithNoExponentialBackoff() {
        awaitReady(clientWithNoExponentialBackoff, node);

        selector.serverDisconnect(node.idString());
        clientWithNoExponentialBackoff.poll(defaultRequestTimeoutMs, time.milliseconds());
        long delay = clientWithNoExponentialBackoff.connectionDelay(node, time.milliseconds());

        assertEquals(reconnectBackoffMsTest, delay);

        // Sleep until there is no connection delay
        time.sleep(delay);
        assertEquals(0, clientWithNoExponentialBackoff.connectionDelay(node, time.milliseconds()));

        // Start connecting and disconnect before the connection is established
        client.ready(node, time.milliseconds());
        selector.serverDisconnect(node.idString());
        client.poll(defaultRequestTimeoutMs, time.milliseconds());

        // Second attempt should have the same behaviour as exponential backoff is disabled
        assertEquals(reconnectBackoffMsTest, delay);
    }
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