Stabilize staff concurrency and premium emoji; enable verified Drone deployment

tests/conftest.py

@@ -0,0 +1,27 @@
+"""All tests use disposable databases and a synthetic Telegram token."""
+import os
+import tempfile
+from pathlib import Path
+
+import pytest_asyncio
+
+_temporary = tempfile.TemporaryDirectory(prefix="lottery-tests-")
+os.environ["DATABASE_URL"] = os.getenv("TEST_DATABASE_URL") or (
+    "sqlite+aiosqlite:///" + (Path(_temporary.name) / "test.db").as_posix()
+)
+os.environ["BOT_TOKEN"] = "123456:TEST_TOKEN_FOR_ISOLATED_TESTS"
+os.environ["ADMIN_IDS"] = "900001"
+os.environ["CASHIER_IDS"] = "900002"
+os.environ["REDIS_URL"] = ""
+
+from src.core.database import Base, engine, async_session_maker
+from src.core import models
+
+
+@pytest_asyncio.fixture(autouse=True)
+async def database():
+    async with engine.begin() as connection:
+        await connection.run_sync(Base.metadata.drop_all)
+        await connection.run_sync(Base.metadata.create_all)
+    yield async_session_maker
+    await engine.dispose()