garydgregory commented on code in PR #754:
URL: https://github.com/apache/commons-vfs/pull/754#discussion_r3000871544
##
commons-vfs2/src/test/java/org/apache/commons/vfs2/provider/sftp/SftpPasswordAuthTest.java:
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.vfs2.provider.sftp;
+
+import static org.apache.commons.vfs2.VfsTestUtils.getTestDirectoryFile;
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.File;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.vfs2.*;
+import org.apache.commons.vfs2.auth.StaticUserAuthenticator;
+import org.apache.commons.vfs2.impl.DefaultFileSystemConfigBuilder;
+import org.apache.commons.vfs2.impl.DefaultFileSystemManager;
+import org.apache.commons.vfs2.provider.local.DefaultLocalFileProvider;
+import org.apache.sshd.SshServer;
+import org.apache.sshd.common.KeyPairProvider;
+import org.apache.sshd.common.NamedFactory;
+import org.apache.sshd.common.Session;
+import org.apache.sshd.server.Command;
+import org.apache.sshd.server.FileSystemFactory;
+import org.apache.sshd.server.FileSystemView;
+import org.apache.sshd.server.SshFile;
+import org.apache.sshd.server.filesystem.NativeSshFile;
+import org.apache.sshd.server.sftp.SftpSubsystem;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+import com.jcraft.jsch.TestIdentityRepositoryFactory;
+
+/**
+ * Tests SFTP password authentication using {@link StaticUserAuthenticator}.
+ *
+ * Verifies that credentials supplied via {@link
DefaultFileSystemConfigBuilder#setUserAuthenticator}
+ * are correctly propagated to the SFTP server.
+ *
+ *
+ * Uses SSHD 0.8.0 with an explicit RSA {@link KeyPairProvider} for Java 17
compatibility
+ * (the default DSA key generation is disabled on modern JDKs).
+ *
+ */
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+public class SftpPasswordAuthTest {
+
+private static final String TEST_USERNAME = "testuser";
+private static final String TEST_PASSWORD = "testpass";
+
+private static SshServer sshServer;
+private static int serverPort;
+private static DefaultFileSystemManager manager;
+
+@BeforeAll
+static void setUp() throws Exception {
+sshServer = SshServer.setUpDefaultServer();
+sshServer.setPort(0);
+
+final KeyPairGenerator hostKeyGen =
KeyPairGenerator.getInstance("RSA");
+hostKeyGen.initialize(2048);
+final KeyPair hostKey = hostKeyGen.generateKeyPair();
+sshServer.setKeyPairProvider(new KeyPairProvider() {
+@Override
+public KeyPair loadKey(final String type) {
+return KeyPairProvider.SSH_RSA.equals(type) ? hostKey : null;
+}
+@Override
+public String getKeyTypes() {
+return KeyPairProvider.SSH_RSA;
+}
+});
+
+sshServer.setPasswordAuthenticator(
+(user, pass, session) -> TEST_USERNAME.equals(user) &&
TEST_PASSWORD.equals(pass));
+
+final List> subsystems = new ArrayList<>();
+subsystems.add(new NamedFactory() {
+@Override
+public Command create() { return new SftpSubsystem(); }
+@Override
+public String getName() { return "sftp"; }
+});
+sshServer.setSubsystemFactories(subsystems);
+
+sshServer.setFileSystemFactory(new TestFileSystemFactory());
+sshServer.start();
+
+serverPort = sshServer.getPort();
+
+manager = new DefaultFileSystemManager();
+manager.addProvider("sftp", new SftpFileProvider());
+manager.addProvider("file", new DefaultLocalFileProvider());
+manager.init();
+}
+
+@AfterAll
+static void tearDown() throws Exception {
+if (manager != null) {
+try {
+manager.close();
+} catch (final Except
