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.kafka.common.utils;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class ByteBufferInputStreamTest {
  
      @Test
      public void testReadUnsignedIntFromInputStream() throws IOException {
          ByteBuffer buffer = ByteBuffer.allocate(8);
          buffer.put((byte) 10);
          buffer.put((byte) 20);
          buffer.put((byte) 30);
          buffer.flip(); // prepare for reading
  
          byte[] b = new byte[6];
  
          ByteBufferInputStream inputStream = new ByteBufferInputStream(buffer);
          assertEquals(3, inputStream.available());
          // read two bytes
          assertEquals(10, inputStream.read());
          assertEquals(20, inputStream.read());
  
          // try to read 3 bytes but only able to read one
          assertEquals(1, inputStream.read(b, 3, b.length - 3));
          // all bytes have been read, no more data to read, return -1
          assertEquals(-1, inputStream.read());
  
          // rewind input and prepare for read again
          buffer.rewind();
  
          // read 3 bytes
          assertEquals(3, inputStream.read(b, 0, b.length));
          // all bytes have been read, no more data to read, return -1
          assertEquals(-1, inputStream.read(b, 0, b.length));
  
          // read 0 bytes
          assertEquals(0, inputStream.read(b, 0, 0));
          assertEquals(-1, inputStream.read());
      }
  }
  