@ParameterizedTest
    @ArgumentsSource(SslTransportLayerArgumentsProvider.class)
    public void testClientAuthenticationRequiredNotProvided(Args args) throws Exception {
        args.sslServerConfigs.put(BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG, "required");
        CertStores.KEYSTORE_PROPS.forEach(args.sslClientConfigs::remove);
        verifySslConfigsWithHandshakeFailure(args);
    }
Tests that server does not accept connections from clients which don't
provide a certificate when client authentication is required.
clients/src/test/java/org/apache/kafka/common/network/SslTransportLayerTest.java