/*
    * 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.commons.vfs2;
  
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  
  import org.junit.Test;
  
  /**
   * File system test that check that a file system can be modified.
   */
  public class ProviderWriteAppendTests extends AbstractProviderTestCase {
      /**
       * Sets up a scratch folder for the test to use.
       */
      protected FileObject createScratchFolder() throws Exception {
          final FileObject scratchFolder = getWriteFolder();
  
          // Make sure the test folder is empty
          scratchFolder.delete(Selectors.EXCLUDE_SELF);
          scratchFolder.createFolder();
  
          return scratchFolder;
      }
  
      /**
       * Returns the capabilities required by the tests of this test case.
       */
      @Override
      protected Capability[] getRequiredCapabilities() {
          return new Capability[] { Capability.CREATE, Capability.DELETE, Capability.GET_TYPE, Capability.LIST_CHILDREN,
                  Capability.READ_CONTENT, Capability.WRITE_CONTENT, Capability.APPEND_CONTENT };
      }
  
      /**
       * Tests create-delete-create-a-file sequence on the same file system.
       */
      @Test
      public void testAppendContent() throws Exception {
          final FileObject scratchFolder = createScratchFolder();
  
          // Create direct child of the test folder
          final FileObject file = scratchFolder.resolveFile("file1.txt");
          assertFalse(file.exists());
  
          // Create the source file
          final String content = "Here is some sample content for the file.  Blah Blah Blah.";
          final String contentAppend = content + content;
  
          try (OutputStream os = file.getContent().getOutputStream()) {
              os.write(content.getBytes(StandardCharsets.UTF_8));
          }
          assertSameContent(content, file);
  
          // Append to the new file
          try (OutputStream os2 = file.getContent().getOutputStream(true)) {
              os2.write(content.getBytes(StandardCharsets.UTF_8));
          }
          assertSameContent(contentAppend, file);
  
          // Make sure we can copy the new file to another file on the same filesystem
          final FileObject fileCopy = scratchFolder.resolveFile("file1copy.txt");
          assertFalse(fileCopy.exists());
          fileCopy.copyFrom(file, Selectors.SELECT_SELF);
  
          assertSameContent(contentAppend, fileCopy);
  
          // Delete the file.
          assertTrue(fileCopy.exists());
          assertTrue(fileCopy.delete());
      }
  }