fix(tests): fixed test runtime errors regarding database connection

7project/backend/app/app.py

@@ -28,7 +28,8 @@ from app.services.user_service import SECRET
 from fastapi import FastAPI
 import sentry_sdk
 from fastapi_users.db import SQLAlchemyUserDatabase
-from app.core.db import async_session_maker
+from app.core.db import async_session_maker, engine
+from app.core.base import Base
 
 sentry_sdk.init(
     dsn=os.getenv("SENTRY_DSN"),
@@ -37,6 +38,14 @@ sentry_sdk.init(
 
 fastApi = FastAPI()
 
+@fastApi.on_event("startup")
+async def on_startup():
+    # Ensure DB schema is created for tests/dev
+    from sqlalchemy.ext.asyncio import AsyncEngine
+    from sqlalchemy import text
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
 # CORS for frontend dev server
 fastApi.add_middleware(
     CORSMiddleware,

7project/backend/app/core/db.py

@@ -1,25 +1,33 @@
 import os
+from urllib.parse import urlparse
 from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
 from app.core.base import Base
 
+# Determine DATABASE_URL with sensible defaults for local testing
 DATABASE_URL = os.getenv("DATABASE_URL")
 if not DATABASE_URL:
-    mariadb_host = os.getenv("MARIADB_HOST", "localhost")
+    mariadb_host = os.getenv("MARIADB_HOST")
     mariadb_port = os.getenv("MARIADB_PORT", "3306")
-    mariadb_db = os.getenv("MARIADB_DB", "group_project")
+    mariadb_db = os.getenv("MARIADB_DB")
-    mariadb_user = os.getenv("MARIADB_USER", "root")
+    mariadb_user = os.getenv("MARIADB_USER")
-    mariadb_password = os.getenv("MARIADB_PASSWORD", "strongpassword")
+    mariadb_password = os.getenv("MARIADB_PASSWORD")
     if mariadb_host and mariadb_db and mariadb_user and mariadb_password:
         DATABASE_URL = f"mysql+asyncmy://{mariadb_user}:{mariadb_password}@{mariadb_host}:{mariadb_port}/{mariadb_db}"
     else:
-        raise Exception("Only MariaDB is supported. Please set the DATABASE_URL environment variable.")
+        # Default to local SQLite for tests/development when nothing is configured
+        DATABASE_URL = os.getenv("SQLITE_URL", "sqlite+aiosqlite:///./test.db")
 
 # Load all models to register them
 from app.models.user import User
 from app.models.transaction import Transaction
 from app.models.categories import Category
 
-host_env = os.getenv("MARIADB_HOST", "localhost")
+# Configure connect args based on backend
+parsed = urlparse(DATABASE_URL)
+scheme = parsed.scheme
+connect_args = {}
+if scheme.startswith("mysql"):
+    host_env = os.getenv("MARIADB_HOST", parsed.hostname or "localhost")
     ssl_enabled = host_env not in {"localhost", "127.0.0.1"}
     connect_args = {"ssl": {"ssl": True}} if ssl_enabled else {}
 

7project/backend/app/services/db.py

@@ -3,11 +3,20 @@ from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 from fastapi_users.db import SQLAlchemyUserDatabase
 
-from ..core.db import async_session_maker
+from ..core.db import async_session_maker, engine
+from ..core.base import Base
 from ..models.user import User, OAuthAccount
 
+_initialized = False
+
 
 async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
+    global _initialized
+    if not _initialized:
+        # Lazily ensure tables exist; helpful for test runs without migrations
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.create_all)
+        _initialized = True
     async with async_session_maker() as session:
         yield session