/*
 * 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.samza.serializers;

import java.nio.ByteBuffer;
import org.junit.Test;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;


public class TestByteBufferSerde {
  @Test
  public void testSerde() {
    ByteBufferSerde serde = new ByteBufferSerde();
    assertNull(serde.toBytes(null));
    assertNull(serde.fromBytes(null));

    byte[] bytes = "A lazy way of creating a byte array".getBytes();
    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
    byteBuffer.mark();
    assertArrayEquals(bytes, serde.toBytes(byteBuffer));
    byteBuffer.reset();
    assertEquals(byteBuffer, serde.fromBytes(bytes));
  }

  @Test
  public void testSerializationPreservesInput() {
    ByteBufferSerde serde = new ByteBufferSerde();
    byte[] bytes = "A lazy way of creating a byte array".getBytes();
    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
    byteBuffer.get(); // advance position by 1
    serde.toBytes(byteBuffer);

    assertEquals(byteBuffer.capacity(), byteBuffer.limit());
    assertEquals(1, byteBuffer.position());
  }
}