### Question:
ContentSummary implements Writable { @Override @InterfaceAudience.Private public void write(DataOutput out) throws IOException { out.writeLong(length); out.writeLong(fileCount); out.writeLong(directoryCount); out.writeLong(quota); out.writeLong(spaceConsumed); out.writeLong(spaceQuota); } @Deprecated  ContentSummary(); @Deprecated  ContentSummary(long length, long fileCount, long directoryCount); @Deprecated  ContentSummary(
      long length, long fileCount, long directoryCount, long quota,
      long spaceConsumed, long spaceQuota); private  ContentSummary(
      long length, long fileCount, long directoryCount, long quota,
      long spaceConsumed, long spaceQuota, long typeConsumed[],
      long typeQuota[]); long getLength(); long getDirectoryCount(); long getFileCount(); long getQuota(); long getSpaceConsumed(); long getSpaceQuota(); long getTypeQuota(StorageType type); long getTypeConsumed(StorageType type); boolean isTypeQuotaSet(); boolean isTypeConsumedAvailable(); @Override @InterfaceAudience.Private void write(DataOutput out); @Override @InterfaceAudience.Private void readFields(DataInput in); static String getHeader(boolean qOption); static String[] getHeaderFields(); static String[] getQuotaHeaderFields(); @Override String toString(); String toString(boolean qOption); String toString(boolean qOption, boolean hOption);  }### Answer:
@Test public void testWrite() throws IOException { long length = 11111; long fileCount = 22222; long directoryCount = 33333; long quota = 44444; long spaceConsumed = 55555; long spaceQuota = 66666; ContentSummary contentSummary = new ContentSummary.Builder().length(length). fileCount(fileCount).directoryCount(directoryCount).quota(quota). spaceConsumed(spaceConsumed).spaceQuota(spaceQuota).build(); DataOutput out = mock(DataOutput.class); InOrder inOrder = inOrder(out); contentSummary.write(out); inOrder.verify(out).writeLong(length); inOrder.verify(out).writeLong(fileCount); inOrder.verify(out).writeLong(directoryCount); inOrder.verify(out).writeLong(quota); inOrder.verify(out).writeLong(spaceConsumed); inOrder.verify(out).writeLong(spaceQuota); }