text: // Copyright (c) 2012-2013 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "dbwrapper.h"
  #include "uint256.h"
  #include "random.h"
  #include "test/test_pwrb.h"
  
  #include <boost/assign/std/vector.hpp> // for 'operator+=()'
  #include <boost/assert.hpp>
  #include <boost/test/unit_test.hpp>
  
  
  // Test if a string consists entirely of null characters
  bool is_null_key(const std::vector<unsigned char>& key) {
      bool isnull = true;
  
      for (unsigned int i = 0; i < key.size(); i++)
          isnull &= (key[i] == '\x00');
  
      return isnull;
  }
  
  BOOST_FIXTURE_TEST_SUITE(dbwrapper_tests, BasicTestingSetup)
  
  BOOST_AUTO_TEST_CASE(dbwrapper)
  {
      {
          boost::filesystem::path ph = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path();
          CDBWrapper dbw(ph, (1 << 20), true, false);
          char key = 'k';
          uint256 in = GetRandHash();
          uint256 res;
  
          BOOST_CHECK(dbw.Write(key, in));
          BOOST_CHECK(dbw.Read(key, res));
          BOOST_CHECK_EQUAL(res.ToString(), in.ToString());
      }
  }
  
  // Test batch operations
  BOOST_AUTO_TEST_CASE(dbwrapper_batch)
  {
      {
          boost::filesystem::path ph = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path();
          CDBWrapper dbw(ph, (1 << 20), true, false);
  
          char key = 'i';
          uint256 in = GetRandHash();
          char key2 = 'j';
          uint256 in2 = GetRandHash();
          char key3 = 'k';
          uint256 in3 = GetRandHash();
  
          uint256 res;
          CDBBatch batch;
  
          batch.Write(key, in);
          batch.Write(key2, in2);
          batch.Write(key3, in3);
  
          // Remove key3 before it's even been written
          batch.Erase(key3);
  
          dbw.WriteBatch(batch);
  
          BOOST_CHECK(dbw.Read(key, res));
          BOOST_CHECK_EQUAL(res.ToString(), in.ToString());
          BOOST_CHECK(dbw.Read(key2, res));
          BOOST_CHECK_EQUAL(res.ToString(), in2.ToString());
  
          // key3 never should've been written
          BOOST_CHECK(dbw.Read(key3, res) == false);
      }
  }
  
  BOOST_AUTO_TEST_CASE(dbwrapper_iterator)
  {
      {
          boost::filesystem::path ph = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path();
          CDBWrapper dbw(ph, (1 << 20), true, false);
  
          // The two keys are intentionally chosen for ordering
          char key = 'j';
          uint256 in = GetRandHash();
          BOOST_CHECK(dbw.Write(key, in));
          char key2 = 'k';
          uint256 in2 = GetRandHash();
          BOOST_CHECK(dbw.Write(key2, in2));
  
          boost::scoped_ptr<CDBIterator> it(const_cast<CDBWrapper*>(&dbw)->NewIterator());
  
          // Be sure to seek past any earlier key (if it exists)
          it->Seek(key);
  
          char key_res;
          uint256 val_res;
  
          it->GetKey(key_res);
          it->GetValue(val_res);
          BOOST_CHECK_EQUAL(key_res, key);
          BOOST_CHECK_EQUAL(val_res.ToString(), in.ToString());
  
          it->Next();
  
          it->GetKey(key_res);
          it->GetValue(val_res);
          BOOST_CHECK_EQUAL(key_res, key2);
          BOOST_CHECK_EQUAL(val_res.ToString(), in2.ToString());
  
          it->Next();
          BOOST_CHECK_EQUAL(it->Valid(), false);
      }
  }
  
  BOOST_AUTO_TEST_SUITE_END()
  