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.assertNotEquals;
  import static org.junit.Assert.assertSame;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link ExposedByteArrayInputStream}. */
  @RunWith(JUnit4.class)
  public class ExposedByteArrayInputStreamTest {
  
    private static final byte[] TEST_DATA = "Hello World!".getBytes(StandardCharsets.UTF_8);
  
    private ByteArrayInputStream stream = new ByteArrayInputStream(TEST_DATA);
  
    private ExposedByteArrayInputStream exposedStream = new ExposedByteArrayInputStream(TEST_DATA);
  
    @Test
    public void testConstructWithEmptyArray() throws IOException {
      try (ExposedByteArrayInputStream s = new ExposedByteArrayInputStream(new byte[0])) {
        assertEquals(0, s.available());
        byte[] data = s.readAll();
        assertEquals(0, data.length);
      }
    }
  
    @Test
    public void testReadAll() throws IOException {
      assertEquals(TEST_DATA.length, exposedStream.available());
      byte[] data = exposedStream.readAll();
      assertArrayEquals(TEST_DATA, data);
      assertSame(TEST_DATA, data);
      assertEquals(0, exposedStream.available());
    }
  
    @Test
    public void testReadPartial() throws IOException {
      assertEquals(TEST_DATA.length, exposedStream.available());
      assertEquals(TEST_DATA.length, stream.available());
      byte[] data1 = new byte[4];
      byte[] data2 = new byte[4];
      int ret1 = exposedStream.read(data1);
      int ret2 = stream.read(data2);
      assertEquals(ret2, ret1);
      assertArrayEquals(data2, data1);
      assertEquals(stream.available(), exposedStream.available());
    }
  
    @Test
    public void testReadAllAfterReadPartial() throws IOException {
      assertNotEquals(-1, exposedStream.read());
      byte[] ret = exposedStream.readAll();
      assertArrayEquals("ello World!".getBytes(StandardCharsets.UTF_8), ret);
    }
  }
  