@ParameterizedTest
    @ArgumentsSource(SslTransportLayerArgumentsProvider.class)
    public void testPemFilesWithoutServerKeyPassword(Args args) throws Exception {
        TestSslUtils.convertToPem(args.sslServerConfigs, !args.useInlinePem, false);
        TestSslUtils.convertToPem(args.sslClientConfigs, !args.useInlinePem, true);
        verifySslConfigs(args);
    }
Test with PEM key store files without key password for server key store.We don't allow this
with PEM files since unprotected private key on disk is not safe.
clients/src/test/java/org/apache/kafka/common/network/SslTransportLayerTest.java