implement basic testing fixtures and linting

backend/src/tests/test_main.py

@@ -0,0 +1,34 @@
+from fastapi.testclient import TestClient
+import pytest
+from ..main import app
+
+@pytest.fixture()
+def client():
+    return TestClient(app)
+
+
+def test_new_trip_invalid_prefs(client):
+    response = client.post(
+        "/trip/new",
+        json={
+            "preferences": {},
+            "start": [48.8566, 2.3522]
+            }
+        )
+    assert response.status_code == 422
+
+
+def test_new_trip_single_prefs(client):
+    response = client.post(
+        "/trip/new",
+        json={
+            "preferences": {"sightseeing": {"type": "sightseeing", "score": 1}, "nature": {"type": "nature", "score": 1}, "shopping": {"type": "shopping", "score": 1}, "max_time_minute": 360, "detour_tolerance_minute": 0},
+            "start": [48.8566, 2.3522]
+            }
+        )
+    assert response.status_code == 200
+
+
+def test_new_trip_matches_prefs(client):
+    # todo
+    pass