diff --git a/server.py b/server.py
index 4084baeac..f41ce1ae9 100644
--- a/server.py
+++ b/server.py
@@ -48,6 +48,7 @@ def purchasePlaces():
     placesRequired = int(request.form['places'])
     competition['numberOfPlaces'] = int(competition['numberOfPlaces'])-placesRequired
     flash('Great-booking complete!')
+    club["points"] = int(club["points"]) - placesRequired
     return render_template('welcome.html', club=club, competitions=competitions)
 
 
diff --git a/test/tests_unitaires/test_server.py b/test/tests_unitaires/test_server.py
new file mode 100644
index 000000000..d8025fef0
--- /dev/null
+++ b/test/tests_unitaires/test_server.py
@@ -0,0 +1,29 @@
+import pytest
+from server import app
+
+@pytest.fixture
+def client():
+    app.config['TESTING'] = True
+    with app.test_client() as client:
+        yield client
+
+def test_competition_places_are_decreased(client, monkeypatch):
+    # Club avec assez de points
+    test_club = {"name": "Test Club", "email": "test@club.com", "points": "20"}
+    # Compétition avec 10 places
+    test_competition = {"name": "Test Competition", "numberOfPlaces": "10", "date": "2025-12-12 10:00:00"}
+
+    # Patch les données directement dans server.py
+    monkeypatch.setattr("server.clubs", [test_club])
+    monkeypatch.setattr("server.competitions", [test_competition])
+
+    # POST de réservation de 3 places
+    response = client.post("/purchasePlaces", data={
+        "competition": "Test Competition",
+        "club": "Test Club",
+        "places": "3"
+    }, follow_redirects=True)
+
+    #  Vérifie que la compétition a bien été mise à jour
+    assert test_competition["numberOfPlaces"] == 7  # 10 - 3
+