diff --git a/docker-compose-aio.yml b/docker-compose-aio.yml
new file mode 100644
index 0000000..e1be07a
--- /dev/null
+++ b/docker-compose-aio.yml
@@ -0,0 +1,40 @@
+# Copyright © 2020 Interplanetary Database Association e.V.,
+# Planetmint and IPDB software contributors.
+# SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
+# Code is Apache-2.0 and docs are CC-BY-4.0
+
+version: '2.2'
+
+services:
+  planetmint-all-in-one:
+    image: planetmint/planetmint-aio:latest
+    expose:
+      - "22"
+      - "9984"
+      - "9985"
+      - "26656"
+      - "26657"
+      - "26658"
+    command: ["/usr/src/app/scripts/pre-config-planetmint.sh", "/usr/src/app/scripts/all-in-one.bash"]
+    volumes:
+      - ./integration/scripts:/usr/src/app/scripts
+      - shared:/shared
+    scale: ${SCALE:-4}
+
+  test:
+    build:
+      context: .
+      dockerfile: integration/python/Dockerfile
+    depends_on:
+      - planetmint-all-in-one
+    command: ["/scripts/pre-config-test.sh", "/scripts/wait-for-planetmint.sh", "/scripts/test.sh", "pytest", "/src"]
+    environment:
+      SCALE: ${SCALE:-4}
+    volumes:
+      - ./integration/python/src:/src
+      - ./integration/scripts:/scripts
+      - ./integration/cli:/tests
+      - shared:/shared
+
+volumes:
+  shared:
\ No newline at end of file
diff --git a/planetmint/application/validator.py b/planetmint/application/validator.py
index 44b3100..4fbd951 100644
--- a/planetmint/application/validator.py
+++ b/planetmint/application/validator.py
@@ -28,14 +28,13 @@ from planetmint.backend.models.output import Output
 from planetmint.model.dataaccessor import DataAccessor
 from planetmint.config import Config
 from planetmint.config_utils import load_validation_plugin
+from planetmint.utils.singleton import Singleton
 
 logger = logging.getLogger(__name__)
 
-
-class Validator:
-    def __init__(self, async_io: bool = False):
-        self.async_io = async_io
-        self.models = DataAccessor(async_io=async_io)
+class Validator():
+    def __init__(self):
+        self.models = DataAccessor()
         self.validation = Validator._get_validation_method()
 
     @staticmethod
@@ -260,7 +259,7 @@ class Validator:
         value as the `voting_power`
         """
         validators = {}
-        for validator in self.models.get_validators(height):
+        for validator in self.models.get_validators(height=height):
             # NOTE: we assume that Tendermint encodes public key in base64
             public_key = public_key_from_ed25519_key(key_from_base64(validator["public_key"]["value"]))
             validators[public_key] = validator["voting_power"]
diff --git a/planetmint/backend/connection.py b/planetmint/backend/connection.py
index 10eb022..b7129da 100644
--- a/planetmint/backend/connection.py
+++ b/planetmint/backend/connection.py
@@ -64,7 +64,6 @@ class DBConnection(metaclass=DBSingleton):
         backend: str = None,
         connection_timeout: int = None,
         max_tries: int = None,
-        async_io: bool = False,
         **kwargs
     ):
         """Create a new :class:`~.Connection` instance.
diff --git a/planetmint/backend/tarantool/sync_io/query.py b/planetmint/backend/tarantool/sync_io/query.py
index 171e712..dad622e 100644
--- a/planetmint/backend/tarantool/sync_io/query.py
+++ b/planetmint/backend/tarantool/sync_io/query.py
@@ -420,11 +420,12 @@ def store_validator_set(conn, validators_update: dict):
         conn.connect().select(TARANT_TABLE_VALIDATOR_SETS, validators_update["height"], index="height", limit=1).data
     )
     unique_id = uuid4().hex if _validator is None or len(_validator) == 0 else _validator[0][0]
-    conn.connect().upsert(
+    result = conn.connect().upsert(
         TARANT_TABLE_VALIDATOR_SETS,
         (unique_id, validators_update["height"], validators_update["validators"]),
         op_list=[("=", 1, validators_update["height"]), ("=", 2, validators_update["validators"])],
     )
+    return result
 
 
 @register_query(TarantoolDBConnection)
diff --git a/planetmint/model/dataaccessor.py b/planetmint/model/dataaccessor.py
index a488f96..33e59ae 100644
--- a/planetmint/model/dataaccessor.py
+++ b/planetmint/model/dataaccessor.py
@@ -17,13 +17,21 @@ from planetmint.backend.models.output import Output
 from planetmint.backend.models.asset import Asset
 from planetmint.backend.models.metadata import MetaData
 from planetmint.backend.models.dbtransaction import DbTransaction
+from planetmint.utils.singleton import Singleton
 
 
-class DataAccessor:
-    def __init__(self, database_connection=None, async_io: bool = False):
+class DataAccessor(metaclass=Singleton):
+    def __init__(self, database_connection=None):
         config_utils.autoconfigure()
-        self.connection = database_connection if database_connection is not None else Connection(async_io=async_io)
+        self.connection = database_connection if database_connection is not None else Connection()
 
+
+    def close_connection(self):
+        self.connection.close()
+        
+    def connect(self):
+        self.connection.connect()
+        
     def store_bulk_transactions(self, transactions):
         txns = []
         gov_txns = []
@@ -131,7 +139,7 @@ class DataAccessor:
         value as the `voting_power`
         """
         validators = {}
-        for validator in self.get_validators(height):
+        for validator in self.get_validators(height = height):
             # NOTE: we assume that Tendermint encodes public key in base64
             public_key = public_key_from_ed25519_key(key_from_base64(validator["public_key"]["value"]))
             validators[public_key] = validator["voting_power"]
diff --git a/pytest.ini b/pytest.ini
index b13d936..01b5ef6 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,7 +1,7 @@
 [pytest]
 testpaths = tests/
 norecursedirs = .* *.egg *.egg-info env* devenv* docs
-addopts = -m "abci"
+addopts = -m "not abci"
 looponfailroots = planetmint tests
 asyncio_mode = strict
 markers =
diff --git a/tests/assets/test_divisible_assets.py b/tests/assets/test_divisible_assets.py
index 4daa610..f6a9992 100644
--- a/tests/assets/test_divisible_assets.py
+++ b/tests/assets/test_divisible_assets.py
@@ -157,14 +157,14 @@ def test_single_in_single_own_multiple_out_single_own_transfer(alice, b, user_pk
     )
     tx_create_signed = tx_create.sign([alice.private_key])
 
+    b.models.store_bulk_transactions([tx_create_signed])
+    inputs = tx_create.to_inputs()
     # TRANSFER
     tx_transfer = Transfer.generate(
-        tx_create.to_inputs(), [([alice.public_key], 50), ([alice.public_key], 50)], asset_ids=[tx_create.id]
+        inputs, [([alice.public_key], 50), ([alice.public_key], 50)], asset_ids=[tx_create.id]
     )
     tx_transfer_signed = tx_transfer.sign([user_sk])
 
-    b.models.store_bulk_transactions([tx_create_signed])
-
     assert b.validate_transaction(tx_transfer_signed) == tx_transfer_signed
     assert len(tx_transfer_signed.outputs) == 2
     assert tx_transfer_signed.outputs[0].amount == 50
diff --git a/tests/commands/test_commands.py b/tests/commands/test_commands.py
index d0f01a8..7f575cb 100644
--- a/tests/commands/test_commands.py
+++ b/tests/commands/test_commands.py
@@ -25,6 +25,96 @@ from planetmint.backend.connection import Connection
 
 from tests.utils import generate_election, generate_validators
 
+def mock_get_validators(height):
+    return [
+        {
+            "public_key": {"value": "zL/DasvKulXZzhSNFwx4cLRXKkSM9GPK7Y0nZ4FEylM=", "type": "ed25519-base64"},
+            "voting_power": 10,
+        }
+    ]
+
+
+@patch("planetmint.commands.utils.start")
+def test_main_entrypoint(mock_start):
+    from planetmint.commands.planetmint import main
+    from planetmint.model.dataaccessor import DataAccessor
+    
+    da = DataAccessor
+    del da
+    main()
+
+    assert mock_start.called
+
+#@pytest.mark.bdb
+def test_chain_migration_election_show_shows_inconclusive(b, test_abci_rpc ):
+    
+    from tests.utils import flush_db
+    flush_db(b.models.connection, "dbname")
+    validators = generate_validators([1] * 4)
+    output = b.models.store_validator_set(1, [v["storage"] for v in validators])
+
+    public_key = validators[0]["public_key"]
+    private_key = validators[0]["private_key"]
+    voter_keys = [v["private_key"] for v in validators]
+
+    election, votes = generate_election(b, ChainMigrationElection, public_key, private_key, [{"data": {}}], voter_keys)
+
+    assert not run_election_show(Namespace(election_id=election.id), b)
+
+    b.process_block(1, [election])
+    b.models.store_bulk_transactions([election])
+
+    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
+
+    b.models.store_block(Block(height=1, transactions=[], app_hash="")._asdict())
+    b.models.store_validator_set(2, [v["storage"] for v in validators])
+
+    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
+
+    b.models.store_block(Block(height=2, transactions=[], app_hash="")._asdict())
+    # TODO insert yet another block here when upgrading to Tendermint 0.22.4.
+
+    assert run_election_show(Namespace(election_id=election.id), b) == "status=inconclusive"
+
+
+@pytest.mark.bdb
+def test_chain_migration_election_show_shows_concluded(b):
+    validators = generate_validators([1] * 4)
+    b.models.store_validator_set(1, [v["storage"] for v in validators])
+
+    public_key = validators[0]["public_key"]
+    private_key = validators[0]["private_key"]
+    voter_keys = [v["private_key"] for v in validators]
+
+    election, votes = generate_election(b, ChainMigrationElection, public_key, private_key, [{"data": {}}], voter_keys)
+
+    assert not run_election_show(Namespace(election_id=election.id), b)
+
+    b.models.store_bulk_transactions([election])
+    b.process_block(1, [election])
+
+    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
+
+    b.models.store_abci_chain(1, "chain-X")
+    b.models.store_block(Block(height=1, transactions=[v.id for v in votes], app_hash="last_app_hash")._asdict())
+    b.process_block(2, votes)
+
+    assert (
+        run_election_show(Namespace(election_id=election.id), b)
+        == f'''status=concluded
+chain_id=chain-X-migrated-at-height-1
+app_hash=last_app_hash
+validators=[{''.join([f"""
+    {{
+        "pub_key": {{
+            "type": "tendermint/PubKeyEd25519",
+            "value": "{v['public_key']}"
+        }},
+        "power": {v['storage']['voting_power']}
+    }}{',' if i + 1 != len(validators) else ''}""" for i, v in enumerate(validators)])}
+]'''
+    )
+
 
 def test_make_sure_we_dont_remove_any_command():
     # thanks to: http://stackoverflow.com/a/18161115/597097
@@ -59,13 +149,23 @@ def test_make_sure_we_dont_remove_any_command():
     assert parser.parse_args(["tendermint-version"]).command
 
 
-@patch("planetmint.commands.utils.start")
-def test_main_entrypoint(mock_start):
-    from planetmint.commands.planetmint import main
 
-    main()
 
-    assert mock_start.called
+@pytest.mark.bdb
+def test_election_approve_called_with_bad_key(monkeypatch, caplog, b, bad_validator_path, new_validator, node_key, test_abci_rpc):
+    from argparse import Namespace
+
+    b, election_id = call_election(monkeypatch, b, new_validator, node_key, test_abci_rpc)
+
+    # call run_upsert_validator_approve with args that point to the election, but a bad signing key
+    args = Namespace(action="approve", election_id=election_id, sk=bad_validator_path, config={})
+
+    with caplog.at_level(logging.ERROR):
+        assert not run_election_approve(args, b, test_abci_rpc)
+        assert (
+            caplog.records[0].msg == "The key you provided does not match any of "
+            "the eligible voters in this election."
+        )
 
 
 @patch("planetmint.config_utils.setup_logging")
@@ -444,11 +544,11 @@ def test_election_approve_with_tendermint(b, priv_validator_path, user_sk, valid
 
 
 @pytest.mark.bdb
-def test_election_approve_without_tendermint(caplog, b, priv_validator_path, new_validator, node_key, test_abci_rpc):
+def test_election_approve_without_tendermint(monkeypatch, caplog, b, priv_validator_path, new_validator, node_key, test_abci_rpc):
     from planetmint.commands.planetmint import run_election_approve
     from argparse import Namespace
 
-    b, election_id = call_election(b, new_validator, node_key, test_abci_rpc)
+    b, election_id = call_election(monkeypatch, b, new_validator, node_key, test_abci_rpc)
 
     # call run_election_approve with args that point to the election
     args = Namespace(action="approve", election_id=election_id, sk=priv_validator_path, config={})
@@ -460,11 +560,13 @@ def test_election_approve_without_tendermint(caplog, b, priv_validator_path, new
         assert b.models.get_transaction(approval_id)
 
 
+
+from unittest import mock
 @pytest.mark.bdb
-def test_election_approve_failure(caplog, b, priv_validator_path, new_validator, node_key, test_abci_rpc):
+def test_election_approve_failure(monkeypatch, caplog, b, priv_validator_path, new_validator, node_key, test_abci_rpc):
     from argparse import Namespace
 
-    b, election_id = call_election(b, new_validator, node_key, test_abci_rpc)
+    b, election_id = call_election(monkeypatch, b, new_validator, node_key, test_abci_rpc)
 
     def mock_write(modelist, endpoint, mode_commit, transaction, mode):
         b.models.store_bulk_transactions([transaction])
@@ -480,91 +582,6 @@ def test_election_approve_failure(caplog, b, priv_validator_path, new_validator,
         assert caplog.records[0].msg == "Failed to commit vote"
 
 
-@pytest.mark.bdb
-def test_election_approve_called_with_bad_key(caplog, b, bad_validator_path, new_validator, node_key, test_abci_rpc):
-    from argparse import Namespace
-
-    b, election_id = call_election(b, new_validator, node_key, test_abci_rpc)
-
-    # call run_upsert_validator_approve with args that point to the election, but a bad signing key
-    args = Namespace(action="approve", election_id=election_id, sk=bad_validator_path, config={})
-
-    with caplog.at_level(logging.ERROR):
-        assert not run_election_approve(args, b, test_abci_rpc)
-        assert (
-            caplog.records[0].msg == "The key you provided does not match any of "
-            "the eligible voters in this election."
-        )
-
-
-@pytest.mark.bdb
-def test_chain_migration_election_show_shows_inconclusive(b):
-    validators = generate_validators([1] * 4)
-    b.models.store_validator_set(1, [v["storage"] for v in validators])
-
-    public_key = validators[0]["public_key"]
-    private_key = validators[0]["private_key"]
-    voter_keys = [v["private_key"] for v in validators]
-
-    election, votes = generate_election(b, ChainMigrationElection, public_key, private_key, [{"data": {}}], voter_keys)
-
-    assert not run_election_show(Namespace(election_id=election.id), b)
-
-    b.process_block(1, [election])
-    b.models.store_bulk_transactions([election])
-
-    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
-
-    b.models.store_block(Block(height=1, transactions=[], app_hash="")._asdict())
-    b.models.store_validator_set(2, [v["storage"] for v in validators])
-
-    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
-
-    b.models.store_block(Block(height=2, transactions=[], app_hash="")._asdict())
-    # TODO insert yet another block here when upgrading to Tendermint 0.22.4.
-
-    assert run_election_show(Namespace(election_id=election.id), b) == "status=inconclusive"
-
-
-@pytest.mark.bdb
-def test_chain_migration_election_show_shows_concluded(b):
-    validators = generate_validators([1] * 4)
-    b.models.store_validator_set(1, [v["storage"] for v in validators])
-
-    public_key = validators[0]["public_key"]
-    private_key = validators[0]["private_key"]
-    voter_keys = [v["private_key"] for v in validators]
-
-    election, votes = generate_election(b, ChainMigrationElection, public_key, private_key, [{"data": {}}], voter_keys)
-
-    assert not run_election_show(Namespace(election_id=election.id), b)
-
-    b.models.store_bulk_transactions([election])
-    b.process_block(1, [election])
-
-    assert run_election_show(Namespace(election_id=election.id), b) == "status=ongoing"
-
-    b.models.store_abci_chain(1, "chain-X")
-    b.models.store_block(Block(height=1, transactions=[v.id for v in votes], app_hash="last_app_hash")._asdict())
-    b.process_block(2, votes)
-
-    assert (
-        run_election_show(Namespace(election_id=election.id), b)
-        == f'''status=concluded
-chain_id=chain-X-migrated-at-height-1
-app_hash=last_app_hash
-validators=[{''.join([f"""
-    {{
-        "pub_key": {{
-            "type": "tendermint/PubKeyEd25519",
-            "value": "{v['public_key']}"
-        }},
-        "power": {v['storage']['voting_power']}
-    }}{',' if i + 1 != len(validators) else ''}""" for i, v in enumerate(validators)])}
-]'''
-    )
-
-
 def test_bigchain_tendermint_version(capsys):
     from planetmint.commands.planetmint import run_tendermint_version
 
@@ -578,32 +595,29 @@ def test_bigchain_tendermint_version(capsys):
     assert sorted(output_config["tendermint"]) == sorted(__tm_supported_versions__)
 
 
-def mock_get_validators(height):
-    return [
-        {
-            "public_key": {"value": "zL/DasvKulXZzhSNFwx4cLRXKkSM9GPK7Y0nZ4FEylM=", "type": "ed25519-base64"},
-            "voting_power": 10,
-        }
-    ]
 
+def call_election(monkeypatch, b, new_validator, node_key, abci_rpc):
 
-def call_election(b, new_validator, node_key, abci_rpc):
-    def mock_write(modelist, endpoint, mode_commit, transaction, mode):
+    def mock_write(self, modelist, endpoint, mode_commit, transaction, mode):
         b.models.store_bulk_transactions([transaction])
         return (202, "")
+    with monkeypatch.context() as m:
+        m.setattr("planetmint.model.dataaccessor.DataAccessor.get_validators", mock_get_validators)
+        m.setattr("planetmint.abci.rpc.ABCI_RPC.write_transaction", mock_write)
+        
+        # patch the validator set. We now have one validator with power 10
+        #b.models.get_validators = mock_get_validators
+        #abci_rpc.write_transaction = mock_write
 
-    # patch the validator set. We now have one validator with power 10
-    b.models.get_validators = mock_get_validators
-    abci_rpc.write_transaction = mock_write
+        # our voters is a list of length 1, populated from our mocked validator
+        voters = b.get_recipients_list()
+        # and our voter is the public key from the voter list
+        voter = node_key.public_key
+        valid_election = ValidatorElection.generate([voter], voters, new_validator, None).sign([node_key.private_key])
 
-    # our voters is a list of length 1, populated from our mocked validator
-    voters = b.get_recipients_list()
-    # and our voter is the public key from the voter list
-    voter = node_key.public_key
-    valid_election = ValidatorElection.generate([voter], voters, new_validator, None).sign([node_key.private_key])
-
-    # patch in an election with a vote issued to the user
-    election_id = valid_election.id
-    b.models.store_bulk_transactions([valid_election])
-
-    return b, election_id
+        # patch in an election with a vote issued to the user
+        election_id = valid_election.id
+        b.models.store_bulk_transactions([valid_election])
+        
+        m.undo()
+        return b, election_id
diff --git a/tests/conftest.py b/tests/conftest.py
index 9f99c3e..15dc422 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -27,7 +27,10 @@ from transactions.common import crypto
 from transactions.common.transaction_mode_types import BROADCAST_TX_COMMIT
 from planetmint.abci.utils import key_from_base64
 from planetmint.backend import schema, query
-from transactions.common.crypto import key_pair_from_ed25519_key, public_key_from_ed25519_key
+from transactions.common.crypto import (
+    key_pair_from_ed25519_key,
+    public_key_from_ed25519_key,
+)
 from planetmint.abci.block import Block
 from planetmint.abci.rpc import MODE_LIST
 from tests.utils import gen_vote
@@ -107,7 +110,10 @@ def _configure_planetmint(request):
     # backend = request.config.getoption('--database-backend')
     backend = "tarantool_db"
 
-    config = {"database": Config().get_db_map(backend), "tendermint": Config()._private_real_config["tendermint"]}
+    config = {
+        "database": Config().get_db_map(backend),
+        "tendermint": Config()._private_real_config["tendermint"],
+    }
     config["database"]["name"] = test_db_name
     config = config_utils.env_config(config)
     config_utils.set_config(config)
@@ -133,6 +139,28 @@ def _setup_database(_configure_planetmint):  # TODO Here is located setup databa
     print("Finished deleting `{}`".format(dbname))
 
 
+@pytest.fixture
+def da_reset(_setup_database):
+    from transactions.common.memoize import to_dict, from_dict
+    from transactions.common.transaction import Transaction
+    from .utils import flush_db
+    from planetmint.model.dataaccessor import DataAccessor
+    da = DataAccessor()
+    del da 
+    da = DataAccessor()
+    da.close_connection()
+    da.connect()
+    
+    yield
+    dbname = Config().get()["database"]["name"]
+    flush_db(da.connection, dbname)
+   
+
+    to_dict.cache_clear()
+    from_dict.cache_clear()
+    Transaction._input_valid.cache_clear()
+
+
 @pytest.fixture
 def _bdb(_setup_database):
     from transactions.common.memoize import to_dict, from_dict
@@ -140,6 +168,7 @@ def _bdb(_setup_database):
     from .utils import flush_db
     from planetmint.config import Config
 
+
     conn = Connection()
     conn.close()
     conn.connect()
@@ -273,11 +302,14 @@ def test_abci_rpc():
 def b():
     from planetmint.application import Validator
 
+    old_validator_instance = Validator()
+    del old_validator_instance.models
+    del old_validator_instance
     validator = Validator()
     validator.models.connection.close()
     validator.models.connection.connect()
     return validator
-
+    
 
 @pytest.fixture
 def eventqueue_fixture():
@@ -296,7 +328,12 @@ def mock_get_validators(network_validators):
     def validator_set(height):
         validators = []
         for public_key, power in network_validators.items():
-            validators.append({"public_key": {"type": "ed25519-base64", "value": public_key}, "voting_power": power})
+            validators.append(
+                {
+                    "public_key": {"type": "ed25519-base64", "value": public_key},
+                    "voting_power": power,
+                }
+            )
         return validators
 
     return validator_set
@@ -319,7 +356,10 @@ def signed_create_tx(alice, create_tx):
 @pytest.fixture
 def posted_create_tx(b, signed_create_tx, test_abci_rpc):
     res = test_abci_rpc.post_transaction(
-        MODE_LIST, test_abci_rpc.tendermint_rpc_endpoint, signed_create_tx, BROADCAST_TX_COMMIT
+        MODE_LIST,
+        test_abci_rpc.tendermint_rpc_endpoint,
+        signed_create_tx,
+        BROADCAST_TX_COMMIT,
     )
     assert res.status_code == 200
     return signed_create_tx
@@ -339,7 +379,9 @@ def double_spend_tx(signed_create_tx, carol_pubkey, user_sk):
     from transactions.types.assets.transfer import Transfer
 
     inputs = signed_create_tx.to_inputs()
-    tx = Transfer.generate(inputs, [([carol_pubkey], 1)], asset_ids=[signed_create_tx.id])
+    tx = Transfer.generate(
+        inputs, [([carol_pubkey], 1)], asset_ids=[signed_create_tx.id]
+    )
     return tx.sign([user_sk])
 
 
@@ -356,7 +398,9 @@ def inputs(user_pk, b, alice):
     for height in range(1, 4):
         transactions = [
             Create.generate(
-                [alice.public_key], [([user_pk], 1)], metadata=multihash(marshal({"data": f"{random.random()}"}))
+                [alice.public_key],
+                [([user_pk], 1)],
+                metadata=multihash(marshal({"data": f"{random.random()}"})),
             ).sign([alice.private_key])
             for _ in range(10)
         ]
@@ -428,7 +472,13 @@ def _abci_http(request):
 
 
 @pytest.fixture
-def abci_http(_setup_database, _configure_planetmint, abci_server, tendermint_host, tendermint_port):
+def abci_http(
+    _setup_database,
+    _configure_planetmint,
+    abci_server,
+    tendermint_host,
+    tendermint_port,
+):
     import requests
     import time
 
@@ -553,144 +603,15 @@ def utxoset(dummy_unspent_outputs, utxo_collection):
 
     num_rows_before_operation = utxo_collection.select().rowcount
     for utxo in dummy_unspent_outputs:
-        res = utxo_collection.insert((uuid4().hex, utxo["transaction_id"], utxo["output_index"], utxo))
+        res = utxo_collection.insert(
+            (uuid4().hex, utxo["transaction_id"], utxo["output_index"], utxo)
+        )
         assert res
     num_rows_after_operation = utxo_collection.select().rowcount
     assert num_rows_after_operation == num_rows_before_operation + 3
     return dummy_unspent_outputs, utxo_collection
 
 
-@pytest.fixture
-def network_validators(node_keys):
-    validator_pub_power = {}
-    voting_power = [8, 10, 7, 9]
-    for pub, priv in node_keys.items():
-        validator_pub_power[pub] = voting_power.pop()
-
-    return validator_pub_power
-
-
-@pytest.fixture
-def network_validators58(network_validators):
-    network_validators_base58 = {}
-    for p, v in network_validators.items():
-        p = public_key_from_ed25519_key(key_from_base64(p))
-        network_validators_base58[p] = v
-
-    return network_validators_base58
-
-
-@pytest.fixture
-def node_key(node_keys):
-    (pub, priv) = list(node_keys.items())[0]
-    return key_pair_from_ed25519_key(key_from_base64(priv))
-
-
-@pytest.fixture
-def ed25519_node_keys(node_keys):
-    (pub, priv) = list(node_keys.items())[0]
-    node_keys_dict = {}
-    for pub, priv in node_keys.items():
-        key = key_pair_from_ed25519_key(key_from_base64(priv))
-        node_keys_dict[key.public_key] = key
-
-    return node_keys_dict
-
-
-@pytest.fixture
-def node_keys():
-    return {
-        "zL/DasvKulXZzhSNFwx4cLRXKkSM9GPK7Y0nZ4FEylM=": "cM5oW4J0zmUSZ/+QRoRlincvgCwR0pEjFoY//ZnnjD3Mv8Nqy8q6VdnOFI0XDHhwtFcqRIz0Y8rtjSdngUTKUw==",
-        "GIijU7GBcVyiVUcB0GwWZbxCxdk2xV6pxdvL24s/AqM=": "mdz7IjP6mGXs6+ebgGJkn7kTXByUeeGhV+9aVthLuEAYiKNTsYFxXKJVRwHQbBZlvELF2TbFXqnF28vbiz8Cow==",
-        "JbfwrLvCVIwOPm8tj8936ki7IYbmGHjPiKb6nAZegRA=": "83VINXdj2ynOHuhvSZz5tGuOE5oYzIi0mEximkX1KYMlt/Csu8JUjA4+by2Pz3fqSLshhuYYeM+IpvqcBl6BEA==",
-        "PecJ58SaNRsWJZodDmqjpCWqG6btdwXFHLyE40RYlYM=": "uz8bYgoL4rHErWT1gjjrnA+W7bgD/uDQWSRKDmC8otc95wnnxJo1GxYlmh0OaqOkJaobpu13BcUcvITjRFiVgw==",
-    }
-
-
-@pytest.fixture
-def priv_validator_path(node_keys):
-    (public_key, private_key) = list(node_keys.items())[0]
-    priv_validator = {
-        "address": "84F787D95E196DC5DE5F972666CFECCA36801426",
-        "pub_key": {"type": "AC26791624DE60", "value": public_key},
-        "last_height": 0,
-        "last_round": 0,
-        "last_step": 0,
-        "priv_key": {"type": "954568A3288910", "value": private_key},
-    }
-    fd, path = tempfile.mkstemp()
-    socket = os.fdopen(fd, "w")
-    json.dump(priv_validator, socket)
-    socket.close()
-    return path
-
-
-@pytest.fixture
-def bad_validator_path(node_keys):
-    (public_key, private_key) = list(node_keys.items())[1]
-    priv_validator = {
-        "address": "84F787D95E196DC5DE5F972666CFECCA36801426",
-        "pub_key": {"type": "AC26791624DE60", "value": public_key},
-        "last_height": 0,
-        "last_round": 0,
-        "last_step": 0,
-        "priv_key": {"type": "954568A3288910", "value": private_key},
-    }
-    fd, path = tempfile.mkstemp()
-    socket = os.fdopen(fd, "w")
-    json.dump(priv_validator, socket)
-    socket.close()
-    return path
-
-
-@pytest.fixture
-def validators(b, node_keys):
-    from planetmint.backend import query
-    import time
-
-    def timestamp():  # we need this to force unique election_ids for setup and teardown of fixtures
-        return str(time.time())
-
-    height = get_block_height(b)
-
-    original_validators = b.models.get_validators()
-
-    (public_key, private_key) = list(node_keys.items())[0]
-
-    validator_set = [
-        {
-            "address": "F5426F0980E36E03044F74DD414248D29ABCBDB2",
-            "public_key": {"value": public_key, "type": "ed25519-base64"},
-            "voting_power": 10,
-        }
-    ]
-
-    validator_update = {"validators": validator_set, "height": height + 1, "election_id": f"setup_at_{timestamp()}"}
-
-    query.store_validator_set(b.models.connection, validator_update)
-
-    yield
-
-    height = get_block_height(b)
-
-    validator_update = {
-        "validators": original_validators,
-        "height": height,
-        "election_id": f"teardown_at_{timestamp()}",
-    }
-
-    query.store_validator_set(b.models.connection, validator_update)
-
-
-def get_block_height(b):
-    if b.models.get_latest_block():
-        height = b.models.get_latest_block()["height"]
-    else:
-        height = 0
-
-    return height
-
-
 @pytest.fixture
 def new_validator():
     public_key = "1718D2DBFF00158A0852A17A01C78F4DCF3BA8E4FB7B8586807FAC182A535034"
@@ -698,20 +619,30 @@ def new_validator():
     node_id = "fake_node_id"
 
     return [
-        {"data": {"public_key": {"value": public_key, "type": "ed25519-base16"}, "power": power, "node_id": node_id}}
+        {
+            "data": {
+                "public_key": {"value": public_key, "type": "ed25519-base16"},
+                "power": power,
+                "node_id": node_id,
+            }
+        }
     ]
 
 
 @pytest.fixture
 def valid_upsert_validator_election(b_mock, node_key, new_validator):
     voters = b_mock.get_recipients_list()
-    return ValidatorElection.generate([node_key.public_key], voters, new_validator, None).sign([node_key.private_key])
+    return ValidatorElection.generate(
+        [node_key.public_key], voters, new_validator, None
+    ).sign([node_key.private_key])
 
 
 @pytest.fixture
 def valid_upsert_validator_election_2(b_mock, node_key, new_validator):
     voters = b_mock.get_recipients_list()
-    return ValidatorElection.generate([node_key.public_key], voters, new_validator, None).sign([node_key.private_key])
+    return ValidatorElection.generate(
+        [node_key.public_key], voters, new_validator, None
+    ).sign([node_key.private_key])
 
 
 @pytest.fixture
@@ -720,20 +651,28 @@ def ongoing_validator_election(b, valid_upsert_validator_election, ed25519_node_
     genesis_validators = {"validators": validators, "height": 0}
     query.store_validator_set(b.models.connection, genesis_validators)
     b.models.store_bulk_transactions([valid_upsert_validator_election])
-    query.store_election(b.models.connection, valid_upsert_validator_election.id, 1, is_concluded=False)
-    block_1 = Block(app_hash="hash_1", height=1, transactions=[valid_upsert_validator_election.id])
+    query.store_election(
+        b.models.connection, valid_upsert_validator_election.id, 1, is_concluded=False
+    )
+    block_1 = Block(
+        app_hash="hash_1", height=1, transactions=[valid_upsert_validator_election.id]
+    )
     b.models.store_block(block_1._asdict())
     return valid_upsert_validator_election
 
 
 @pytest.fixture
-def ongoing_validator_election_2(b, valid_upsert_validator_election_2, ed25519_node_keys):
+def ongoing_validator_election_2(
+    b, valid_upsert_validator_election_2, ed25519_node_keys
+):
     validators = b.models.get_validators(height=1)
     genesis_validators = {"validators": validators, "height": 0, "election_id": None}
     query.store_validator_set(b.models.connection, genesis_validators)
 
     b.models.store_bulk_transactions([valid_upsert_validator_election_2])
-    block_1 = Block(app_hash="hash_2", height=1, transactions=[valid_upsert_validator_election_2.id])
+    block_1 = Block(
+        app_hash="hash_2", height=1, transactions=[valid_upsert_validator_election_2.id]
+    )
     b.models.store_block(block_1._asdict())
     return valid_upsert_validator_election_2
 
@@ -861,7 +800,9 @@ def signed_2_0_transfer_tx():
         ],
         "operation": "TRANSFER",
         "metadata": "QmTjWHzypFxE8uuXJXMJQJxgAEKjoWmQimGiutmPyJ6CAB",
-        "asset": {"id": "334014a29d99a488789c711b7dc5fceb534d1a9290b14d0270dbe6b60e2f036e"},
+        "asset": {
+            "id": "334014a29d99a488789c711b7dc5fceb534d1a9290b14d0270dbe6b60e2f036e"
+        },
         "version": "2.0",
         "id": "e577641b0e2eb619e282f802516ce043e9d4af51dd4b6c959e18246e85cae2a6",
     }
diff --git a/tests/elections/test_election.py b/tests/elections/test_election.py
index 032ed28..87a59c5 100644
--- a/tests/elections/test_election.py
+++ b/tests/elections/test_election.py
@@ -5,10 +5,13 @@ from planetmint.abci.block import Block
 from transactions.types.elections.election import Election
 from transactions.types.elections.chain_migration_election import ChainMigrationElection
 from transactions.types.elections.validator_election import ValidatorElection
-
+from planetmint.model.dataaccessor import DataAccessor
 
 @pytest.mark.bdb
 def test_process_block_concludes_all_elections(b):
+    del b.models
+    b.models = DataAccessor()
+    b.models.connect()
     validators = generate_validators([1] * 4)
     b.models.store_validator_set(1, [v["storage"] for v in validators])
 
diff --git a/tests/web/test_blocks.py b/tests/web/test_blocks.py
index e35e150..e475fe8 100644
--- a/tests/web/test_blocks.py
+++ b/tests/web/test_blocks.py
@@ -7,6 +7,15 @@ import pytest
 
 BLOCKS_ENDPOINT = "/api/v1/blocks/"
 
+@pytest.mark.bdb
+@pytest.mark.usefixtures("inputs")
+def test_get_latest_block(client):
+    res = client.get(BLOCKS_ENDPOINT + "latest")
+    assert res.status_code == 200
+    assert len(res.json["transaction_ids"]) == 10
+    assert res.json["app_hash"] == "hash3"
+    assert res.json["height"] == 3
+
 
 @pytest.mark.bdb
 @pytest.mark.usefixtures("inputs")
@@ -55,14 +64,6 @@ def test_get_blocks_by_txid_endpoint_returns_400_bad_query_params(client):
     assert res.json == {"message": "Unknown arguments: status"}
 
 
-@pytest.mark.bdb
-@pytest.mark.usefixtures("inputs")
-def test_get_latest_block(client):
-    res = client.get(BLOCKS_ENDPOINT + "latest")
-    assert res.status_code == 200
-    assert len(res.json["transaction_ids"]) == 10
-    assert res.json["app_hash"] == "hash3"
-    assert res.json["height"] == 3
 
 
 @pytest.mark.bdb