Feat(API): PostgreSQL database setup

- Fix enviroment variables
- Fix the ping route for API
- Added database connection for future testing

backend/tests/blueprints/test_control.py

@@ -1,8 +1,7 @@
-from quart import Response
-from backend.run import app
+from quart import Quart
 
 
-async def test_control() -> None:
+async def test_control(app: Quart) -> None:
     test_client = app.test_client()
-    response: Response = await test_client.get("/control/ping")
+    response = await test_client.get("/control/ping/")
     assert (await response.get_json())["ping"] == "pong"

backend/tests/conftest.py

@@ -0,0 +1,20 @@
+from typing import AsyncGenerator
+
+import pytest
+from quart import Quart
+from quart_db import Connection
+
+from backend.run import app, quart_db
+
+
+@pytest.fixture(name="app", scope="function")
+async def _app() -> AsyncGenerator[Quart, None]:
+    async with app.test_app():
+        yield app
+
+
+@pytest.fixture(name="connection", scope="function")
+async def _connection(app: Quart) -> AsyncGenerator[Connection, None]:
+    async with quart_db.connection() as connection:
+        async with connection.transaction():
+            yield connection