text: /**
   * 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.hdfs;
  
  import java.util.Arrays;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.FSDataInputStream;
  import org.apache.hadoop.fs.FSDataOutputStream;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hdfs.APITraceFileSystem;
  
  import junit.framework.TestCase;
  
  /**
   * Test the APITraceFileSystem preserves functionality
   */
  public class TestAPITraceFileSystem extends TestCase {
    public void testGetPos() throws Exception {
      Configuration conf = new Configuration();
      MiniDFSCluster cluster;
      FileSystem fs;
      FSDataInputStream sin;
      FSDataOutputStream sout;
      Path testPath = new Path("/testAppend");
      byte buf[] = "Hello, World!".getBytes("UTF-16");
      byte buf2[] = new byte[buf.length];
      conf.setClass("fs.hdfs.impl",
                    APITraceFileSystem.class,
                    FileSystem.class);
      conf.setBoolean("dfs.support.append", true);
      conf.setInt("dfs.replication", 1);
      cluster = new MiniDFSCluster(conf, 1, true, null);
      try {
        cluster.waitActive();
        fs = cluster.getFileSystem();
        // create/write
        sout = fs.create(testPath);
        sout.write(buf, 0, buf.length);
        sout.close();
  
        // open/getPos()/readFully
        sin = fs.open(testPath);
        assertEquals(sin.getPos(), 0);
        sin.readFully(0, buf2, 0, buf2.length);
        assertTrue(Arrays.equals(buf, buf2));
        sin.close();
  
        // append/getPos()
        sout = fs.append(testPath);
        assertEquals(sout.getPos(), buf.length);
        sout.close();
        fs.close();
      } finally {
        cluster.shutdown();
      }
    }
  }
  