content: /*
   * 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.beam.sdk.util;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertSame;
  
  import java.io.BufferedInputStream;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Arrays;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link ExposedByteArrayInputStream}. */
  @RunWith(JUnit4.class)
  public class StreamUtilsTest {
  
    private byte[] testData = null;
  
    @Before
    public void setUp() {
      testData = new byte[60 * 1024];
      Arrays.fill(testData, (byte) 32);
    }
  
    @Test
    public void testGetBytesFromExposedByteArrayInputStream() throws IOException {
      InputStream stream = new ExposedByteArrayInputStream(testData);
      byte[] bytes = StreamUtils.getBytesWithoutClosing(stream);
      assertArrayEquals(testData, bytes);
      assertSame(testData, bytes);
      assertEquals(0, stream.available());
    }
  
    @Test
    public void testGetBytesFromByteArrayInputStream() throws IOException {
      InputStream stream = new ByteArrayInputStream(testData);
      byte[] bytes = StreamUtils.getBytesWithoutClosing(stream);
      assertArrayEquals(testData, bytes);
      assertEquals(0, stream.available());
    }
  
    @Test
    public void testGetBytesFromInputStream() throws IOException {
      // Any stream which is not a ByteArrayInputStream.
      InputStream stream = new BufferedInputStream(new ByteArrayInputStream(testData));
      byte[] bytes = StreamUtils.getBytesWithoutClosing(stream);
      assertArrayEquals(testData, bytes);
      assertEquals(0, stream.available());
    }
  }
  