diff --git a/backend/src/tests/test_main.py b/backend/src/tests/test_main.py
index b389376..f4600e5 100644
--- a/backend/src/tests/test_main.py
+++ b/backend/src/tests/test_main.py
@@ -1,10 +1,69 @@
 from fastapi.testclient import TestClient
-import pytest, requests
+from typing import List
+import pytest
 from ..main import app
 from ..structs.landmark import Landmark
 
 
-def landmarks_to_osmid(landmarks: list) -> list :
+@pytest.fixture()
+def client():
+    return TestClient(app)
+
+
+# Base test for checking if the API returns correct error code when no preferences are specified.
+def test_new_trip_invalid_prefs(client):
+    response = client.post(
+        "/trip/new",
+        json={
+            "preferences": {},
+            "start": [48.8566, 2.3522]
+            }
+        )
+    assert response.status_code == 422
+
+    
+# Test no. 1
+def test_turckheim(client):
+    duration_minutes = 15
+    response = client.post(
+        "/trip/new",
+        json={
+            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5}, "nature": {"type": "nature", "score": 5}, "shopping": {"type": "shopping", "score": 5}, "max_time_minute": duration_minutes, "detour_tolerance_minute": 0},
+            "start": [48.084588, 7.280405]
+            }
+        )
+    result = response.json()
+    landmarks = load_trip_landmarks(client, result['first_landmark_uuid'])
+
+    # checks :
+    assert response.status_code == 200  # check for successful planning
+    assert isinstance(landmarks, list)  # check that the return type is a list
+    assert duration_minutes*0.8 < int(result['total_time']) < duration_minutes*1.2
+    assert len(landmarks) > 2           # check that there is something to visit
+
+
+# Test no. 2
+def test_bellecour(client) :
+    duration_minutes = 35
+    response = client.post(
+        "/trip/new",
+        json={
+            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5}, "nature": {"type": "nature", "score": 5}, "shopping": {"type": "shopping", "score": 5}, "max_time_minute": duration_minutes, "detour_tolerance_minute": 0},
+            "start": [45.7576485, 4.8330241]
+            }
+        )
+    result = response.json()
+    landmarks = load_trip_landmarks(client, result['first_landmark_uuid'])
+    osm_ids = landmarks_to_osmid(landmarks)
+
+    # checks :
+    assert response.status_code == 200  # check for successful planning
+    assert duration_minutes*0.8 < int(result['total_time']) < duration_minutes*1.2
+    assert 136200148 in osm_ids         # check for Cathédrale St. Jean in trip
+
+
+
+def landmarks_to_osmid(landmarks: List[Landmark]) -> list :
     """
     Convert the list of landmarks into a list containing their osm ids for quick landmark checking.
     
@@ -64,56 +123,6 @@ def load_trip_landmarks(client, first_uuid):
     return landmarks
 
 
-@pytest.fixture()
-def client():
-    return TestClient(app)
-
-
-# Base test for checking if the API returns correct error code when no preferences are specified.
-def test_new_trip_invalid_prefs(client):
-    response = client.post(
-        "/trip/new",
-        json={
-            "preferences": {},
-            "start": [48.8566, 2.3522]
-            }
-        )
-    assert response.status_code == 422
-
-    
-# Test no. 1
-def test_turckheim(client):
-    response = client.post(
-        "/trip/new",
-        json={
-            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5}, "nature": {"type": "nature", "score": 5}, "shopping": {"type": "shopping", "score": 5}, "max_time_minute": 15, "detour_tolerance_minute": 0},
-            "start": [48.084588, 7.280405]
-            }
-        )
-    result = response.json()
-    landmarks = load_trip_landmarks(client, result['first_landmark_uuid'])
-
-    # checks :
-    assert response.status_code == 200  # check for successful planning
-    assert isinstance(landmarks, list)  # check that the return type is a list
-    assert len(landmarks) > 2           # check that there is something to visit
-
-def test_bellecour(client) :
-    response = client.post(
-        "/trip/new",
-        json={
-            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5}, "nature": {"type": "nature", "score": 5}, "shopping": {"type": "shopping", "score": 5}, "max_time_minute": 35, "detour_tolerance_minute": 0},
-            "start": [45.7576485, 4.8330241]
-            }
-        )
-    result = response.json()
-    landmarks = load_trip_landmarks(client, result['first_landmark_uuid'])
-    osm_ids = landmarks_to_osmid(landmarks)
-
-    # checks :
-    assert response.status_code == 200  # check for successful planning
-    assert 136200148 in osm_ids         # check for Cathédrale St. Jean in trip
-
 
 
 # def test_new_trip_single_prefs(client):