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// 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
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package org.openqa.selenium.remote.http;

import static org.assertj.core.api.Assertions.assertThat;

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

class BinaryMessageTest {

  @Test
  void copiesOnlyTheReadableRegionOfABuffer() {
    // Backing array is 16 bytes but only the slice [4..8) is readable.
    byte[] backing = {0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0};
    ByteBuffer buffer = ByteBuffer.wrap(backing);
    buffer.position(4).limit(8);

    BinaryMessage message = new BinaryMessage(buffer);

    assertThat(message.data()).containsExactly(1, 2, 3, 4);
  }

  @Test
  void wrapTransfersOwnershipWithoutCopying() {
    byte[] payload = {9, 8, 7};

    BinaryMessage wrapped = BinaryMessage.wrap(payload);

    // wrap() shares storage with the caller; the constructor still defends with a copy.
    assertThat(wrapped.data()).isSameAs(payload);
    assertThat(new BinaryMessage(payload).data()).isNotSameAs(payload);
  }
}
