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backend/tests/conftest.py

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+"""Shared pytest fixtures."""
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.db import Base
+
+
+@pytest.fixture
+def db():
+    engine = create_engine("sqlite:///:memory:")
+    Base.metadata.create_all(bind=engine)
+    Session = sessionmaker(bind=engine)
+    session = Session()
+    try:
+        yield session
+    finally:
+        session.close()