message: Add tests for CLevelDBBatch, CLevelDBIterator
  Thanks
  Backports bitcoin@14885068726a8e0dc73ffa127225ab80be3e3612
  (gettxoutsetinfo functional test is already ported)
diff: @@ -42,4 +42,79 @@ BOOST_AUTO_TEST_CASE(leveldbwrapper)
  }
  }
  +// Test batch operations
  +BOOST_AUTO_TEST_CASE(leveldbwrapper_batch)
  +{
  + {
  + path ph = temp_directory_path() / unique_path();
  + CLevelDBWrapper 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;
  + CLevelDBBatch 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(leveldbwrapper_iterator)
  +{
  + {
  + path ph = temp_directory_path() / unique_path();
  + CLevelDBWrapper 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<CLevelDBIterator> it(const_cast<CLevelDBWrapper*>(&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()
  