Initial commit: habit tracker PWA with Google OAuth, push notifications

FastAPI + SQLAlchemy/Alembic + MariaDB backend with Jinja2/htmx/Alpine
server-rendered frontend. Multi-user via Google OAuth, daily habit
tracking, monthly/weekly history views, Web Push reminders via
APScheduler, and PWA support (manifest, service worker, offline caching).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,79 @@
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine, event
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.database import Base, get_db
+from app.main import app
+from app.models.user import User
+from app.security import create_session_token
+from app.config import settings
+
+
+@pytest.fixture()
+def engine():
+    eng = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+
+    @event.listens_for(eng, "connect")
+    def _enable_fk(dbapi_connection, _):
+        cursor = dbapi_connection.cursor()
+        cursor.execute("PRAGMA foreign_keys=ON")
+        cursor.close()
+
+    Base.metadata.create_all(eng)
+    yield eng
+    Base.metadata.drop_all(eng)
+    eng.dispose()
+
+
+@pytest.fixture()
+def db_session(engine):
+    session_factory = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+    session = session_factory()
+    try:
+        yield session
+    finally:
+        session.close()
+
+
+@pytest.fixture()
+def client(db_session):
+    def _override_get_db():
+        yield db_session
+
+    app.dependency_overrides[get_db] = _override_get_db
+    # TestClient를 컨텍스트 매니저(`with`)로 쓰지 않으므로 lifespan(스케줄러 기동)이 실행되지 않는다 —
+    # 테스트가 실제 운영 MariaDB에 붙는 APScheduler 백그라운드 잡을 우연히 건드리지 않게 하기 위함.
+    test_client = TestClient(app)
+    yield test_client
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture()
+def test_user(db_session):
+    user = User(google_sub="test-sub-1", email="tester@example.com", name="테스터")
+    db_session.add(user)
+    db_session.commit()
+    db_session.refresh(user)
+    return user
+
+
+@pytest.fixture()
+def other_user(db_session):
+    user = User(google_sub="test-sub-2", email="other@example.com", name="다른유저")
+    db_session.add(user)
+    db_session.commit()
+    db_session.refresh(user)
+    return user
+
+
+@pytest.fixture()
+def auth_client(client, test_user):
+    token = create_session_token(test_user.id)
+    client.cookies.set(settings.session_cookie_name, token)
+    return client