message: apply change HashMap -> BTreeMap
diff: @@ -7,7 +7,7 @@ extern crate test;
  /// 1. test_scenario_for_apply_blocks_with_chain_feeder_and_check_context - see fn description
  /// 2. test_scenario_for_add_operations_to_mempool_and_check_state - see fn description
  -use std::collections::{HashMap, HashSet};
  +use std::collections::{HashMap, HashSet, BTreeMap};
  use std::path::PathBuf;
  use std::sync::Arc;
  use std::sync::atomic::Ordering;
  @@ -251,7 +251,7 @@ fn check_context(persistent_storage: &PersistentStorage) -> Result<(), failure::
  Ok(())
  }
  -fn assert_ctxt(ctxt: HashMap<String, Bucket<Vec<u8>>>, ocaml_ctxt_as_json: String) {
  +fn assert_ctxt(ctxt: BTreeMap<String, Bucket<Vec<u8>>>, ocaml_ctxt_as_json: String) {
  let json: Value = serde_json::from_str(&ocaml_ctxt_as_json).unwrap();
  for (key, value) in ctxt.iter() {
  // comparing just data
  