fixture to start mappers explicitly, use in repo and uow tests

Author: hjwp

tests/conftest.py

@@ -24,11 +24,16 @@ def in_memory_sqlite_db():
 
 @pytest.fixture
 def sqlite_session_factory(in_memory_sqlite_db):
-    start_mappers()
     yield sessionmaker(bind=in_memory_sqlite_db)
+
+@pytest.fixture
+def mappers():
+    start_mappers()
+    yield
     clear_mappers()
 
 
+
 @retry(stop=stop_after_delay(10))
 def wait_for_postgres_to_come_up(engine):
     return engine.connect()
@@ -54,9 +59,7 @@ def postgres_db():
 
 @pytest.fixture
 def postgres_session_factory(postgres_db):
-    start_mappers()
     yield sessionmaker(bind=postgres_db)
-    clear_mappers()
 
 @pytest.fixture
 def postgres_session(postgres_session_factory):

tests/integration/test_repository.py

@@ -1,6 +1,10 @@
+import pytest
 from allocation.adapters import repository
 from allocation.domain import model
 
+pytestmark = pytest.mark.usefixtures('mappers')
+
+
 def test_get_by_batchref(sqlite_session_factory):
     session = sqlite_session_factory()
     repo = repository.SqlAlchemyRepository(session)

tests/integration/test_uow.py

@@ -3,11 +3,14 @@
 import time
 import traceback
 from typing import List
+from unittest.mock import Mock
 import pytest
 from allocation.domain import model
 from allocation.service_layer import unit_of_work
 from ..random_refs import random_sku, random_batchref, random_orderid
 
+pytestmark = pytest.mark.usefixtures('mappers')
+
 
 def insert_batch(session, ref, sku, qty, eta, product_version=1):
     session.execute(