try {

TESTER test;

// Bypass read-only restriction on state DB access for this unit test which really needs to mutate the DB to properly conduct its test.

eosio::chain::database& db = const_cast<eosio::chain::database&>( test.control->db() );

auto ses = db.start_undo_session(true);

// Create an account

db.create<account_object>([](account_object &a) {

a.name = name("billy");

});

// Make sure we can retrieve that account by name

auto ptr = db.find<account_object, by_name>(name("billy"));

BOOST_TEST(ptr != nullptr);

// Undo creation of the account

ses.undo();

// Make sure we can no longer find the account

ptr = db.find<account_object, by_name>(name("billy"));

BOOST_TEST(ptr == nullptr);

} FC_LOG_AND_RETHROW()

try {

TESTER test;

vector<block_id_type> block_ids;

const uint32_t num_of_blocks_to_prod = 200;

// Produce 200 blocks and check their IDs should match the above

test.produce_blocks(num_of_blocks_to_prod);

for (uint32_t i = 0; i < num_of_blocks_to_prod; ++i) {

block_ids.emplace_back(test.control->fetch_block_by_number(i + 1)->calculate_id());

BOOST_TEST(block_header::num_from_id(block_ids.back()) == i + 1);

BOOST_TEST(test.control->fetch_block_by_number(i + 1)->calculate_id() == block_ids.back());

}

// Check the last irreversible block number is set correctly, with one producer, irreversibility should only just 1 block before

const auto expected_last_irreversible_block_number = test.control->head_block_num() - 1;

BOOST_TEST(test.control->head_block_state()->dpos_irreversible_blocknum == expected_last_irreversible_block_number);

// Ensure that future block doesn't exist

const auto nonexisting_future_block_num = test.control->head_block_num() + 1;

BOOST_TEST(test.control->fetch_block_by_number(nonexisting_future_block_num) == nullptr);

const uint32_t next_num_of_blocks_to_prod = 100;

test.produce_blocks(next_num_of_blocks_to_prod);

const auto next_expected_last_irreversible_block_number = test.control->head_block_num() - 1;

// Check the last irreversible block number is updated correctly

BOOST_TEST(test.control->head_block_state()->dpos_irreversible_blocknum == next_expected_last_irreversible_block_number);

// Previous nonexisting future block should exist by now

BOOST_CHECK_NO_THROW(test.control->fetch_block_by_number(nonexisting_future_block_num));

// Check the latest head block match

BOOST_TEST(test.control->fetch_block_by_number(test.control->head_block_num())->calculate_id() ==

test.control->head_block_id());

} FC_LOG_AND_RETHROW()