@Test
    public void oldSaslPlainPlaintextClientWithoutSaslAuthenticateHeaderFailure() throws Exception {
        verifySaslAuthenticateHeaderInteropWithFailure(true, false, SecurityProtocol.SASL_PLAINTEXT, "PLAIN");
    }
Tests SASL/PLAIN authentication failure over PLAINTEXT with old version of client
that does not support SASL_AUTHENTICATE headers and new version of server.
clients/src/test/java/org/apache/kafka/common/security/authenticator/SaslAuthenticatorTest.java