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.assertEquals;
  import static org.testng.Assert.assertFalse;
  import static org.testng.Assert.assertTrue;
  import static org.testng.Assert.fail;
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  
  import org.apache.datasketches.memory.Buffer;
  import org.apache.datasketches.memory.Memory;
  import org.apache.datasketches.memory.MemoryBoundsException;
  import org.apache.datasketches.memory.ReadOnlyException;
  import org.apache.datasketches.memory.WritableBuffer;
  import org.apache.datasketches.memory.WritableMemory;
  import org.testng.annotations.Test;
  
  public class NativeWritableMemoryImplTest {
  
    //Simple Native direct
  
    @Test
    public void checkNativeCapacityAndClose() {
      int memCapacity = 64;
      WritableMemory mem = WritableMemory.allocateDirect(memCapacity);
      assertEquals(memCapacity, mem.getCapacity());
  
      mem.close(); //intentional
      assertFalse(mem.isValid());
    }
  
    //Simple Native arrays
  
    @Test
    public void checkBooleanArray() {
      boolean[] srcArray = { true, false, true, false, false, true, true, false };
      boolean[] dstArray = new boolean[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getBooleanArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getBooleanArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
      assertTrue(mem.isHeapResource());
    }
  
    @Test
    public void checkByteArray() {
      byte[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      byte[] dstArray = new byte[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getByteArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getByteArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkCharArray() {
      char[] srcArray = { 1, 2, 3, 4, 5, 6, 7, 8 };
      char[] dstArray = new char[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getCharArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getCharArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkShortArray() {
      short[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      short[] dstArray = new short[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getShortArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getShortArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkIntArray() {
      int[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      int[] dstArray = new int[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getIntArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getIntArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkLongArray() {
      long[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      long[] dstArray = new long[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getLongArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getLongArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkFloatArray() {
      float[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      float[] dstArray = new float[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getFloatArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getFloatArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkDoubleArray() {
      double[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
      double[] dstArray = new double[8];
  
      Memory mem = Memory.wrap(srcArray);
      mem.getDoubleArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      wmem.getDoubleArray(0, dstArray, 0, 8);
      for (int i = 0; i < 8; i++) {
        assertEquals(dstArray[i], srcArray[i]);
      }
    }
  
    @Test
    public void checkNativeBaseBound() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.toHexString("Force Assertion Error", memCapacity, 8);
        fail("Should have thrown MemoryBoundsException");
      } catch (MemoryBoundsException e) { //bounds exception
        //ok
      }
    }
  
    @Test
    public void checkNativeSrcArrayBound() {
      long memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        byte[] srcArray = { 1, -2, 3, -4 };
        mem.putByteArray(0L, srcArray, 0, 5);
        fail("Should have thrown MemoryBoundsException");
      } catch (MemoryBoundsException e) {
        //pass
      }
    }
  
    //Copy Within tests
  
    @Test(expectedExceptions = IllegalArgumentException.class)
    public void checkDegenerateCopyTo() {
      WritableMemory wmem = WritableMemory.allocate(64);
      wmem.copyTo(0, wmem, 0, 64); //Attempt to copy a block of memory exactly in-place, should be a bug
    }
  
    @Test
    public void checkCopyWithinNativeSmall() {
      int memCapacity = 64;
      int half = memCapacity / 2;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.clear();
  
        for (int i = 0; i < half; i++) { //fill first half
          mem.putByte(i, (byte) i);
        }
  
        mem.copyTo(0, mem, half, half);
  
        for (int i = 0; i < half; i++) {
          assertEquals(mem.getByte(i + half), (byte) i);
        }
      }
    }
  
    @Test
    public void checkCopyWithinNativeLarge() {
      int memCapacity = (2 << 20) + 64;
      int memCapLongs = memCapacity / 8;
      int halfBytes = memCapacity / 2;
      int halfLongs = memCapLongs / 2;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.clear();
  
        for (int i = 0; i < halfLongs; i++) {
          mem.putLong(i * 8, i);
        }
  
        mem.copyTo(0, mem, halfBytes, halfBytes);
  
        for (int i = 0; i < halfLongs; i++) {
          assertEquals(mem.getLong((i + halfLongs) * 8), i);
        }
      }
    }
  
    @Test
    public void checkCopyWithinNativeSrcBound() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.copyTo(32, mem, 32, 33);  //hit source bound check
        fail("Should have thrown MemoryBoundsException");
      }
      catch (MemoryBoundsException e) {
        //pass
      }
    }
  
    @Test
    public void checkCopyWithinNativeDstBound() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.copyTo(0, mem, 32, 33);  //hit dst bound check
        fail("Should have thrown MemoryBoundsException");
      }
      catch (MemoryBoundsException e) {
        //pass
      }
    }
  
    @Test
    public void checkCopyCrossNativeSmall() {
      int memCapacity = 64;
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity);
          WritableMemory mem2 = WritableMemory.allocateDirect(memCapacity))
      {
        for (int i = 0; i < memCapacity; i++) {
          mem1.putByte(i, (byte) i);
        }
        mem2.clear();
        mem1.copyTo(0, mem2, 0, memCapacity);
  
        for (int i = 0; i < memCapacity; i++) {
          assertEquals(mem2.getByte(i), (byte) i);
        }
      }
    }
  
    @Test
    public void checkCopyCrossNativeLarge() {
      int memCapacity = (2 << 20) + 64;
      int memCapLongs = memCapacity / 8;
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity);
          WritableMemory mem2 = WritableMemory.allocateDirect(memCapacity))
      {
        for (int i = 0; i < memCapLongs; i++) {
          mem1.putLong(i * 8, i);
        }
        mem2.clear();
  
        mem1.copyTo(0, mem2, 0, memCapacity);
  
        for (int i = 0; i < memCapLongs; i++) {
          assertEquals(mem2.getLong(i * 8), i);
        }
      }
    }
  
    @Test
    public void checkCopyCrossNativeAndByteArray() {
      int memCapacity = 64;
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
        for (int i = 0; i < mem1.getCapacity(); i++) {
          mem1.putByte(i, (byte) i);
        }
  
        WritableMemory mem2 = WritableMemory.allocate(memCapacity);
        mem1.copyTo(8, mem2, 16, 16);
  
        for (int i = 0; i < 16; i++) {
          assertEquals(mem1.getByte(8 + i), mem2.getByte(16 + i));
        }
        //println(mem2.toHexString("Mem2", 0, (int)mem2.getCapacity()));
      }
    }
  
    @Test
    public void checkCopyCrossRegionsSameNative() {
      int memCapacity = 128;
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
  
        for (int i = 0; i < mem1.getCapacity(); i++) {
          mem1.putByte(i, (byte) i);
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
  
        Memory reg1 = mem1.region(8, 16);
        //println(reg1.toHexString("Reg1", 0, (int)reg1.getCapacity()));
  
        WritableMemory reg2 = mem1.writableRegion(24, 16);
        //println(reg2.toHexString("Reg2", 0, (int)reg2.getCapacity()));
        reg1.copyTo(0, reg2, 0, 16);
  
        for (int i = 0; i < 16; i++) {
          assertEquals(reg1.getByte(i), reg2.getByte(i));
          assertEquals(mem1.getByte(8 + i), mem1.getByte(24 + i));
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
      }
    }
  
    @Test
    public void checkCopyCrossNativeArrayAndHierarchicalRegions() {
      int memCapacity = 64;
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
  
        for (int i = 0; i < mem1.getCapacity(); i++) { //fill with numbers
          mem1.putByte(i, (byte) i);
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
  
        WritableMemory mem2 = WritableMemory.allocate(memCapacity);
  
        Memory reg1 = mem1.region(8, 32);
        Memory reg1B = reg1.region(8, 16);
        //println(reg1.toHexString("Reg1", 0, (int)reg1.getCapacity()));
        //println(reg1B.toHexString("Reg1B", 0, (int)reg1B.getCapacity()));
  
        WritableMemory reg2 = mem2.writableRegion(32, 16);
        reg1B.copyTo(0, reg2, 0, 16);
        //println(reg2.toHexString("Reg2", 0, (int)reg2.getCapacity()));
  
        //println(mem2.toHexString("Mem2", 0, (int)mem2.getCapacity()));
        for (int i = 32, j = 16; i < 40; i++, j++) {
          assertEquals(mem2.getByte(i), j);
        }
      }
    }
  
    @Test(expectedExceptions = MemoryBoundsException.class)
    public void checkRegionBounds() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.writableRegion(1, 64);
      }
    }
  
    @Test
    public void checkByteBufferWrap() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocate(memCapacity);
      byteBuf.order(ByteOrder.nativeOrder());
  
      for (int i = 0; i < memCapacity; i++) {
        byteBuf.put(i, (byte) i);
      }
  
      WritableMemory wmem = WritableMemory.writableWrap(byteBuf);
  
      for (int i = 0; i < memCapacity; i++) {
        assertEquals(wmem.getByte(i), byteBuf.get(i));
      }
  
      assertTrue(wmem.isByteBufferResource());
      ByteBuffer byteBuf2 = ((ResourceImpl)wmem).getByteBuffer();
      assertEquals(byteBuf2, byteBuf);
      //println( mem.toHexString("HeapBB", 0, memCapacity));
    }
  
    @Test
    public void checkWrapWithBBReadonly1() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocate(memCapacity);
      byteBuf.order(ByteOrder.nativeOrder());
  
      for (int i = 0; i < memCapacity; i++) {
        byteBuf.put(i, (byte) i);
      }
  
      Memory mem = WritableMemory.writableWrap(byteBuf);
  
      for (int i = 0; i < memCapacity; i++) {
        assertEquals(mem.getByte(i), byteBuf.get(i));
      }
  
      //println(mem.toHexString("HeapBB", 0, memCapacity));
    }
  
    @Test(expectedExceptions = ReadOnlyException.class)
    public void checkWrapWithBBReadonly2() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocate(memCapacity);
      byteBuf.order(ByteOrder.nativeOrder());
      ByteBuffer byteBufRO = byteBuf.asReadOnlyBuffer();
  
      WritableMemory.writableWrap(byteBufRO);
    }
  
    @Test
    public void checkWrapWithDirectBBReadonly() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocateDirect(memCapacity);
      byteBuf.order(ByteOrder.nativeOrder());
  
      for (int i = 0; i < memCapacity; i++) {
        byteBuf.put(i, (byte) i);
      }
      ByteBuffer byteBufRO = byteBuf.asReadOnlyBuffer();
      byteBufRO.order(ByteOrder.nativeOrder());
  
      Memory mem = Memory.wrap(byteBufRO);
  
      for (int i = 0; i < memCapacity; i++) {
        assertEquals(mem.getByte(i), byteBuf.get(i));
      }
  
      //println(mem.toHexString("HeapBB", 0, memCapacity));
    }
  
    @Test(expectedExceptions = ReadOnlyException.class)
    public void checkWrapWithDirectBBReadonlyPut() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocateDirect(memCapacity);
      ByteBuffer byteBufRO = byteBuf.asReadOnlyBuffer();
      byteBufRO.order(ByteOrder.nativeOrder());
  
      WritableMemory.writableWrap(byteBufRO);
    }
  
    @Test
    public void checkByteBufferWrapDirectAccess() {
      int memCapacity = 64;
      ByteBuffer byteBuf = ByteBuffer.allocateDirect(memCapacity);
      byteBuf.order(ByteOrder.nativeOrder());
  
      for (int i = 0; i < memCapacity; i++) {
        byteBuf.put(i, (byte) i);
      }
  
      Memory mem = Memory.wrap(byteBuf);
  
      for (int i = 0; i < memCapacity; i++) {
        assertEquals(mem.getByte(i), byteBuf.get(i));
      }
  
      //println( mem.toHexString("HeapBB", 0, memCapacity));
    }
  
    @Test
    public void checkIsDirect() {
      int memCapacity = 64;
      WritableMemory mem = WritableMemory.allocate(memCapacity);
      assertFalse(mem.isDirectResource());
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
        assertTrue(mem1.isDirectResource());
      }
    }
  
    @Test
    public void checkIsReadOnly() {
      long[] srcArray = { 1, -2, 3, -4, 5, -6, 7, -8 };
  
      WritableMemory wmem = WritableMemory.writableWrap(srcArray);
      assertFalse(wmem.isReadOnly());
  
      Memory memRO = wmem;
      assertFalse(memRO.isReadOnly());
  
      for (int i = 0; i < wmem.getCapacity(); i++) {
        assertEquals(wmem.getByte(i), memRO.getByte(i));
      }
    }
  
    @Test
    public void checkGoodBounds() {
      ResourceImpl.checkBounds(50, 50, 100);
    }
  
    @Test
    public void checkCompareToHeap() {
      byte[] arr1 = new byte[] {0, 1, 2, 3};
      byte[] arr2 = new byte[] {0, 1, 2, 4};
      byte[] arr3 = new byte[] {0, 1, 2, 3, 4};
  
      Memory mem1 = Memory.wrap(arr1);
      Memory mem2 = Memory.wrap(arr2);
      Memory mem3 = Memory.wrap(arr3);
      Memory mem4 = Memory.wrap(arr3); //same resource
  
      int comp = mem1.compareTo(0, 3, mem2, 0, 3);
      assertEquals(comp, 0);
      comp = mem1.compareTo(0, 4, mem2, 0, 4);
      assertEquals(comp, -1);
      comp = mem2.compareTo(0, 4, mem1, 0, 4);
      assertEquals(comp, 1);
      //different lengths
      comp = mem1.compareTo(0, 4, mem3, 0, 5);
      assertEquals(comp, -1);
      comp = mem3.compareTo(0, 5, mem1, 0, 4);
      assertEquals(comp, 1);
      comp = mem3.compareTo(0, 5, mem4, 0, 5);
      assertEquals(comp, 0);
      comp = mem3.compareTo(0, 4, mem4, 1, 4);
      assertEquals(comp, -1);
      ((ResourceImpl)mem3).checkValidAndBounds(0, 5);
    }
  
    @Test
    public void checkCompareToDirect() {
      byte[] arr1 = new byte[] {0, 1, 2, 3};
      byte[] arr2 = new byte[] {0, 1, 2, 4};
      byte[] arr3 = new byte[] {0, 1, 2, 3, 4};
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(4);
          WritableMemory mem2 = WritableMemory.allocateDirect(4);
          WritableMemory mem3 = WritableMemory.allocateDirect(5))
      {
        mem1.putByteArray(0, arr1, 0, 4);
        mem2.putByteArray(0, arr2, 0, 4);
        mem3.putByteArray(0, arr3, 0, 5);
  
        int comp = mem1.compareTo(0, 3, mem2, 0, 3);
        assertEquals(comp, 0);
        comp = mem1.compareTo(0, 4, mem2, 0, 4);
        assertEquals(comp, -1);
        comp = mem2.compareTo(0, 4, mem1, 0, 4);
        assertEquals(comp, 1);
        //different lengths
        comp = mem1.compareTo(0, 4, mem3, 0, 5);
        assertEquals(comp, -1);
        comp = mem3.compareTo(0, 5, mem1, 0, 4);
        assertEquals(comp, 1);
      }
    }
  
    @Test
    public void testCompareToSameStart() {
      Memory mem = WritableMemory.allocate(3);
      assertEquals(-1, mem.compareTo(0, 1, mem, 0, 2));
      assertEquals(0, mem.compareTo(1, 1, mem, 1, 1));
      assertEquals(1, mem.compareTo(1, 2, mem, 1, 1));
    }
  
    @Test
    public void checkAsBuffer() {
      WritableMemory wmem = WritableMemory.allocate(64);
      WritableBuffer wbuf = wmem.asWritableBuffer();
      wbuf.setPosition(32);
      for (int i = 32; i < 64; i++) { wbuf.putByte((byte)i); }
      //println(wbuf.toHexString("Buf", 0, (int)wbuf.getCapacity()));
  
      Buffer buf = wmem.asBuffer();
      buf.setPosition(32);
      for (int i = 32; i < 64; i++) {
        assertEquals(buf.getByte(), i);
      }
    }
  
    @Test
    public void checkCumAndRegionOffset() {
      WritableMemory wmem = WritableMemory.allocate(64);
      WritableMemory reg = wmem.writableRegion(32, 32);
      assertEquals(reg.getTotalOffset(), 32);
      assertEquals(((ResourceImpl)reg).getCumulativeOffset(0), 32 + 16);
  
    }
  
    @Test
    public void checkIsSameResource() {
      byte[] byteArr = new byte[64];
      WritableMemory wmem1 = WritableMemory.writableWrap(byteArr);
      WritableMemory wmem2 = WritableMemory.writableWrap(byteArr);
      assertTrue(wmem1.isSameResource(wmem2));
    }
  
    @Test
    public void checkAsWritableBufferWithBB() {
      ByteBuffer byteBuf = ByteBuffer.allocate(64);
      byteBuf.position(16);
      byteBuf.limit(48);
      WritableMemory wmem = WritableMemory.writableWrap(byteBuf);
      WritableBuffer wbuf = wmem.asWritableBuffer();
      assertEquals(wbuf.getCapacity(), 64);
      assertEquals(wbuf.getPosition(), 0);
      assertEquals(wbuf.getEnd(), 64);
    }
  
    @Test(expectedExceptions = ReadOnlyException.class)
    public void checkAsWritableRegionRO() {
      ByteBuffer byteBuf = ByteBuffer.allocate(64);
      WritableMemory wmem = (WritableMemory) Memory.wrap(byteBuf);
      wmem.writableRegion(0, 1);
    }
  
    @Test(expectedExceptions = ReadOnlyException.class)
    public void checkAsWritableBufferRO() {
      ByteBuffer byteBuf = ByteBuffer.allocate(64);
      WritableMemory wmem = (WritableMemory) Memory.wrap(byteBuf);
      wmem.asWritableBuffer();
    }
  
    @Test void checkZeroMemory() {
      WritableMemory wmem = WritableMemory.allocate(8);
      WritableMemory reg = wmem.writableRegion(0, 0);
      assertEquals(reg.getCapacity(), 0);
    }
  
    @Test
    public void checkAsBufferNonNative() {
      WritableMemory wmem = WritableMemory.allocate(64);
      wmem.putShort(0, (short) 1);
      Buffer buf = wmem.asBuffer(Util.NON_NATIVE_BYTE_ORDER);
      assertEquals(buf.getShort(0), 256);
    }
  
    @Test
    public void printlnTest() {
      println("PRINTING: " + this.getClass().getName());
    }
  
    /**
     * @param s value to print
     */
    static void println(String s) {
      //System.out.println(s); //disable here
    }
  
  }
  