Start Core Hub FastAPI replacement foundation

tests/conftest.py

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+import pytest
+from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
+
+import core_hub.models  # noqa: F401
+from core_hub.app import create_app
+from core_hub.db import Base
+
+
+@pytest.fixture
+def app():
+    return create_app()
+
+
+@pytest.fixture
+async def sqlite_engine() -> AsyncEngine:
+    engine = create_async_engine("sqlite+aiosqlite:///:memory:")
+    async with engine.begin() as connection:
+        await connection.run_sync(Base.metadata.create_all)
+    try:
+        yield engine
+    finally:
+        await engine.dispose()