add some tests for db.find_ratings

tests/conftest.py

@@ -0,0 +1,30 @@
+import asyncio
+
+import pytest
+from unwind import db
+
+
+@pytest.fixture(scope="session")
+def event_loop():
+    loop = asyncio.new_event_loop()
+    yield loop
+    loop.run_until_complete(loop.shutdown_asyncgens())
+    loop.run_until_complete(loop.shutdown_default_executor())
+    loop.close()
+
+
+@pytest.fixture(scope="session")
+async def shared_conn():
+    c = db.shared_connection()
+    await c.connect()
+
+    await db.apply_db_patches(c)
+    yield c
+
+    await c.disconnect()
+
+
+@pytest.fixture
+async def conn(shared_conn):
+    async with shared_conn.transaction(force_rollback=True):
+        yield shared_conn