mpryahin commented on a change in pull request #1999:
URL: https://github.com/apache/hadoop/pull/1999#discussion_r427613230



##########
File path: 
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/sftp/SFTPContract.java
##########
@@ -0,0 +1,108 @@
+/*
+ * 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
+ *
+ *       http://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.hadoop.fs.contract.sftp;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileSystemTestHelper;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.contract.AbstractFSContract;
+import org.apache.hadoop.fs.sftp.SFTPFileSystem;
+import org.apache.sshd.common.NamedFactory;
+import org.apache.sshd.server.SshServer;
+import org.apache.sshd.server.auth.UserAuth;
+import org.apache.sshd.server.auth.password.UserAuthPasswordFactory;
+import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
+import org.apache.sshd.server.subsystem.sftp.SftpSubsystemFactory;
+
+public class SFTPContract extends AbstractFSContract {
+
+  private String testDataDir = new FileSystemTestHelper().getTestRootDir();
+  private Configuration conf;
+  public static final String CONTRACT_XML = "contract/sftp.xml";
+  private SshServer sshd;
+
+  public SFTPContract(Configuration conf) {
+    super(conf);
+    addConfResource(CONTRACT_XML);
+    this.conf = conf;
+  }
+
+  @Override
+  public void init() throws IOException {
+    sshd = SshServer.setUpDefaultServer();
+    // ask OS to assign a port
+    sshd.setPort(0);
+    sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider());
+
+    List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<>();
+    userAuthFactories.add(new UserAuthPasswordFactory());
+
+    sshd.setUserAuthFactories(userAuthFactories);
+    sshd.setPasswordAuthenticator((username, password, session) ->
+        username.equals("user") && password.equals("password")
+    );
+
+    sshd.setSubsystemFactories(
+        Collections.singletonList(new SftpSubsystemFactory()));
+
+    sshd.start();
+    int port = sshd.getPort();
+
+    conf.setClass("fs.sftp.impl", SFTPFileSystem.class, FileSystem.class);

Review comment:
       double checked, it's quite strange. Is it a candidate for an improvement 
issue?




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