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backend/tests/conftest.py

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+import os
+import tempfile
+from collections.abc import Generator
+from pathlib import Path
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.config import Settings
+
+TEST_ADMIN_TOKEN = "test-secret-token"
+
+
+@pytest.fixture
+def tmp_data_dir() -> Generator[Path, None, None]:
+    with tempfile.TemporaryDirectory() as tmpdir:
+        data_dir = Path(tmpdir)
+        (data_dir / "assets").mkdir()
+        yield data_dir
+
+
+@pytest.fixture
+def _env_settings(tmp_data_dir: Path) -> Generator[None, None, None]:
+    original_env = os.environ.copy()
+    os.environ["HANDIN_ADMIN_TOKEN"] = TEST_ADMIN_TOKEN
+    os.environ["HANDIN_DATA_DIR"] = str(tmp_data_dir)
+
+    from app.config import get_settings
+
+    get_settings.cache_clear()
+    yield
+    os.environ.clear()
+    os.environ.update(original_env)
+    get_settings.cache_clear()
+
+
+@pytest.fixture
+def settings(_env_settings: None) -> Settings:
+    from app.config import get_settings
+
+    s = get_settings()
+    assert isinstance(s, Settings)
+    return s
+
+
+@pytest.fixture
+def db(tmp_data_dir: Path) -> Path:
+    """Return path to an initialized SQLite database in the temp dir."""
+    from app.database import init_db
+
+    db_path = tmp_data_dir / "handin.db"
+    init_db(db_path)
+    return db_path
+
+
+@pytest.fixture
+def client(_env_settings: None) -> TestClient:
+    from app.main import app
+
+    return TestClient(app)