private static CertStores.Builder certBuilder(boolean isServer, String cn, boolean useInlinePem) {
        return new CertStores.Builder(isServer)
                .cn(cn)
                .usePem(useInlinePem);
    }
Tests invalid ssl.engine.factory plugin class
clients/src/test/java/org/apache/kafka/common/network/SslTransportLayerTest.java