Removed duplicated import
@@ -27,11 +27,8 @@ mod tests {
use test::Bencher;
use std::collections::BTreeMap;
-
use exonum::storage::{ProofMapIndex, Database, Fork, LevelDB, LevelDBOptions, LevelDBCache,
StorageValue, Patch, RocksDB, RocksDBOptions, RocksBlockOptions};
-
- use std::collections::BTreeMap;
use exonum::blockchain::{Blockchain, Transaction};
use exonum::crypto::{gen_keypair, Hash, PublicKey, SecretKey};
use exonum::messages::Message;
