/* 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.io;
  
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.ByteArrayInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.io.test.TestUtils;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  
  /**
   * Tests {@link FileUtils}.
   */
  public class FileUtilsCopyToFileTest {
  
      private final class CheckingInputStream extends ByteArrayInputStream {
          private boolean closed;
  
          public CheckingInputStream(final byte[] data) {
              super(data);
              closed = false;
          }
  
          @Override
          public void close() throws IOException {
              super.close();
              closed = true;
          }
  
          public boolean isClosed() {
              return closed;
          }
      }
  
      @TempDir
      public File temporaryFolder;
  
      private File testFile;
  
      private byte[] testData;
  
      @BeforeEach
      public void setUp() throws Exception {
          testFile = new File(temporaryFolder, "file1-test.txt");
          if (!testFile.getParentFile().exists()) {
              throw new IOException("Cannot create file " + testFile +
                  " as the parent directory does not exist");
          }
  
          testData = TestUtils.generateTestData(1024);
      }
  
      /**
       * Tests that {@code copyInputStreamToFile(InputStream, File)} closes the input stream.
       *
       * @throws IOException
       * @see FileUtils#copyInputStreamToFile(InputStream, File)
       * @see FileUtils#copyToFile(InputStream, File)
       */
      @Test
      public void testCopyInputStreamToFile() throws IOException {
          try (CheckingInputStream inputStream = new CheckingInputStream(testData)) {
              FileUtils.copyInputStreamToFile(inputStream, testFile);
              assertTrue(inputStream.isClosed(), "inputStream should be closed");
          }
      }
  
      /**
       * Tests that {@code copyToFile(InputStream, File)} does not close the input stream.
       *
       * @throws IOException
       * @see FileUtils#copyToFile(InputStream, File)
       * @see FileUtils#copyInputStreamToFile(InputStream, File)
       */
      @Test
      public void testCopyToFile() throws IOException {
          try (CheckingInputStream inputStream = new CheckingInputStream(testData)) {
              FileUtils.copyToFile(inputStream, testFile);
              assertFalse(inputStream.isClosed(), "inputStream should NOT be closed");
          }
      }
  }