code: /*
   * 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.datasketches.memory.internal;
  
  import static org.testng.Assert.fail;
  
  import org.apache.datasketches.memory.Buffer;
  import org.apache.datasketches.memory.BufferPositionInvariantsException;
  import org.apache.datasketches.memory.Memory;
  import org.apache.datasketches.memory.WritableMemory;
  import org.testng.annotations.Test;
  
  /**
   * @author Lee Rhodes
   */
  public class BaseBufferTest {
  
    @Test
    public void checkLimits() {
      Buffer buf = Memory.wrap(new byte[100]).asBuffer();
      buf.setStartPositionEnd(40, 45, 50);
      buf.setStartPositionEnd(0, 0, 100);
      try {
        buf.setStartPositionEnd(0, 0, 101);
        fail();
      } catch (BufferPositionInvariantsException e) {
        //ok
      }
    }
  
    @Test
    public void checkLimitsAndCheck() {
      Buffer buf = Memory.wrap(new byte[100]).asBuffer();
      buf.setStartPositionEnd(40, 45, 50);
      buf.setStartPositionEnd(0, 0, 100);
      try {
        buf.setStartPositionEnd(0, 0, 101);
        fail();
      } catch (BufferPositionInvariantsException e) {
        //ok
      }
      buf.setPosition(100);
      try {
        buf.setPosition(101);
        fail();
      } catch (BufferPositionInvariantsException e) {
        //ok
      }
      buf.setPosition(99);
      buf.incrementAndCheckPosition(1L);
      try {
        buf.incrementAndCheckPosition(1L);
        fail();
      } catch (BufferPositionInvariantsException e) {
        //ok
      }
    }
  
    @Test(expectedExceptions = IllegalStateException.class)
    public void checkCheckValid() {
  
      Buffer buf;
      try (WritableMemory wmem = WritableMemory.allocateDirect(100)) {
        buf = wmem.asBuffer();
      }
      @SuppressWarnings("unused")
      Memory mem = buf.asMemory(); //wmem, buf no longer valid
    }
  }
  