@ParameterizedTest
    @ArgumentsSource(SslTransportLayerArgumentsProvider.class)
    public void testPemFiles(Args args) throws Exception {
        TestSslUtils.convertToPem(args.sslServerConfigs, true, true);
        TestSslUtils.convertToPem(args.sslClientConfigs, true, true);
        args.sslServerConfigs.put(BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG, "required");
        verifySslConfigs(args);
    }
Tests PEM key store and trust store files which don't have store passwords.
clients/src/test/java/org/apache/kafka/common/network/SslTransportLayerTest.java