text: // record_store_test_datasize.cpp
  
  /**
   *    Copyright (C) 2014 MongoDB Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the GNU Affero General Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  
  #include "mongo/db/storage/record_store_test_harness.h"
  
  #include <boost/scoped_ptr.hpp>
  
  #include "mongo/db/storage/record_store.h"
  #include "mongo/unittest/unittest.h"
  
  using std::string;
  using std::stringstream;
  
  namespace mongo {
  
  using boost::scoped_ptr;
  
  // Verify that an empty collection takes up no space.
  TEST(RecordStoreTestHarness, DataSizeEmpty) {
      scoped_ptr<HarnessHelper> harnessHelper(newHarnessHelper());
      scoped_ptr<RecordStore> rs(harnessHelper->newNonCappedRecordStore());
  
      {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          ASSERT_EQUALS(0, rs->numRecords(opCtx.get()));
      }
  
      {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          ASSERT(rs->dataSize(opCtx.get()) == 0);
      }
  }
  
  // Verify that a nonempty collection takes up some space.
  TEST(RecordStoreTestHarness, DataSizeNonEmpty) {
      scoped_ptr<HarnessHelper> harnessHelper(newHarnessHelper());
      scoped_ptr<RecordStore> rs(harnessHelper->newNonCappedRecordStore());
  
      {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          ASSERT_EQUALS(0, rs->numRecords(opCtx.get()));
      }
  
      int nToInsert = 10;
      for (int i = 0; i < nToInsert; i++) {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          {
              stringstream ss;
              ss << "record " << i;
              string data = ss.str();
  
              WriteUnitOfWork uow(opCtx.get());
              StatusWith<RecordId> res =
                  rs->insertRecord(opCtx.get(), data.c_str(), data.size() + 1, false);
              ASSERT_OK(res.getStatus());
              uow.commit();
          }
      }
  
      {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          ASSERT_EQUALS(nToInsert, rs->numRecords(opCtx.get()));
      }
  
      {
          scoped_ptr<OperationContext> opCtx(harnessHelper->newOperationContext());
          ASSERT(rs->dataSize(opCtx.get()) > 0);
      }
  }
  
  }  // namespace mongo
  