private SaslHandshakeRequest createSaslHandshakeRequest(short version) {
        return new SaslHandshakeRequest.Builder(
                new SaslHandshakeRequestData().setMechanism("PLAIN")).build(version);
    }
Check that all error codes in the response get included in {@link AbstractResponse#errorCounts()}.
clients/src/test/java/org/apache/kafka/common/requests/RequestResponseTest.java