message: prettify add_peer_test
diff: @@ -175,6 +175,7 @@ TEST_F(FakePeerExampleFixture, MstStatePropagtesToNewPeer) {
  * @then itf peer gets synchronized, sees itself in the WSV and can commit txs
  */
  TEST_F(FakePeerExampleFixture, RealPeerIsAdded) {
  + // ------------------------ GIVEN ------------------------
  // create the initial fake peer
  auto initial_peer = itf_->addFakePeer(boost::none);
  @@ -225,15 +226,17 @@ TEST_F(FakePeerExampleFixture, RealPeerIsAdded) {
  .signAndAddSignature(initial_peer->getKeypair())
  .finish();
  + // provide the initial_peer with the blocks
  auto block_storage =
  std::make_shared<fake_peer::BlockStorage>(getTestLogger("BlockStorage"));
  block_storage->storeBlock(clone(genesis_block));
  block_storage->storeBlock(clone(block_with_add_peer));
  initial_peer->setBlockStorage(block_storage);
  + // instruct the initial fake peer to send a commit when synchronization needed
  using iroha::consensus::yac::YacHash;
  struct SynchronizerBehaviour : public fake_peer::HonestBehaviour {
  - SynchronizerBehaviour(YacHash sync_hash)
  + explicit SynchronizerBehaviour(YacHash sync_hash)
  : sync_hash_(std::move(sync_hash)) {}
  void processYacMessage(
  std::shared_ptr<const fake_peer::YacMessage> message) override {
  @@ -253,6 +256,8 @@ TEST_F(FakePeerExampleFixture, RealPeerIsAdded) {
  iroha::ordering::kFirstRejectRound},
  "proposal_hash",
  block_with_add_peer.hash().hex()}));
  +
  + // launch the initial_peer
  auto new_peer_server = initial_peer->run();
  // init the itf peer with our genesis block
  @@ -262,8 +267,12 @@ TEST_F(FakePeerExampleFixture, RealPeerIsAdded) {
  auto itf_sync_events_observable = itf_->getPcsOnCommitObservable().replay();
  itf_sync_events_observable.connect();
  + // ------------------------ WHEN -------------------------
  + // launch the itf peer
  itf_->subscribeQueuesAndRun();
  + // ------------------------ THEN -------------------------
  + // check that itf peer is synchronized
  itf_sync_events_observable
  .timeout(kSynchronizerWaitingTime, rxcpp::observe_on_new_thread())
  .filter([](const auto &sync_event) {
  @@ -290,7 +299,20 @@ TEST_F(FakePeerExampleFixture, RealPeerIsAdded) {
  }
  });
  - // send some valid tx and check that it gets committed
  + // check that itf peer sees the two peers in the WSV
  + auto opt_peers = itf_->getIrohaInstance()
  + .getIrohaInstance()
  + ->getStorage()
  + ->createPeerQuery()
  + .value()
  + ->getLedgerPeers();
  + ASSERT_TRUE(opt_peers);
  + EXPECT_THAT(*opt_peers,
  + ::testing::UnorderedElementsAre(
  + makePeerPointeeMatcher(itf_->getThisPeer()),
  + makePeerPointeeMatcher(initial_peer->getThisPeer())));
  +
  + // send some valid tx to itf and check that it gets committed
  itf_->sendTxAwait(
  complete(
  baseTx(kAdminId)
  