diff --git a/app/but/bulletin_but_pdf.py b/app/but/bulletin_but_pdf.py
index 0d5b6b2df7..ce215c14fb 100644
--- a/app/but/bulletin_but_pdf.py
+++ b/app/but/bulletin_but_pdf.py
@@ -212,6 +212,34 @@ class BulletinGeneratorStandardBUT(BulletinGeneratorStandard):
         else:
             self.ue_std_rows(rows, ue, title_bg)
 
+    @staticmethod
+    def affichage_bonus_malus(ue: dict) -> list:
+        fields_bmr = []
+        # lecture des bonus sport culture et malus (ou bonus autre) (0 si valeur non numérique)
+        try:
+            bonus_sc = float(ue.get("bonus", 0.0)) or 0
+        except ValueError:
+            bonus_sc = 0
+        try:
+            malus = float(ue.get("malus", 0.0)) or 0
+        except ValueError:
+            malus = 0
+        # Calcul de l affichage
+        if malus < 0:
+            if bonus_sc > 0:
+                fields_bmr.append(f"Bonus sport/culture: {bonus_sc}")
+                fields_bmr.append(f"Bonus autres: {-malus}")
+            else:
+                fields_bmr.append(f"Bonus: {-malus}")
+        elif malus > 0:
+            if bonus_sc > 0:
+                fields_bmr.append(f"Bonus: {bonus_sc}")
+            fields_bmr.append(f"Malus: {malus}")
+        else:
+            if bonus_sc > 0:
+                fields_bmr.append(f"Bonus: {bonus_sc}")
+        return fields_bmr
+
     def ue_std_rows(self, rows: list, ue: dict, title_bg: tuple):
         "Lignes décrivant une UE standard dans la table de synthèse"
         # 2eme ligne titre UE (bonus/malus/ects)
@@ -220,20 +248,7 @@ class BulletinGeneratorStandardBUT(BulletinGeneratorStandard):
         else:
             ects_txt = ""
         # case Bonus/Malus/Rang "bmr"
-        fields_bmr = []
-        try:
-            value = float(ue.get("bonus", 0.0))
-            if value != 0:
-                fields_bmr.append(f"Bonus: {ue['bonus']}")
-        except ValueError:
-            pass
-        try:
-            value = float(ue.get("malus", 0.0))
-            if value != 0:
-                fields_bmr.append(f"Malus: {ue['malus']}")
-        except ValueError:
-            pass
-
+        fields_bmr = BulletinGeneratorStandardBUT.affichage_bonus_malus(ue)
         moy_ue = ue.get("moyenne", "-")
         if isinstance(moy_ue, dict):  # UE non capitalisées
             if self.preferences["bul_show_ue_rangs"]:
diff --git a/tests/unit/test_bulletin_bonus.py b/tests/unit/test_bulletin_bonus.py
new file mode 100644
index 0000000000..21587f754f
--- /dev/null
+++ b/tests/unit/test_bulletin_bonus.py
@@ -0,0 +1,82 @@
+"""Tests unitaires : bulletins de notes
+
+Utiliser comme: 
+    pytest tests/unit/test_bulletin_bonus.py
+
+"""
+from app.but.bulletin_but_pdf import BulletinGeneratorStandardBUT
+
+
+def test_nobonus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({}) == []
+
+
+def test_bonus_sport_nul():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({"bonus": 0}) == []
+
+
+def test_malus_nul():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({"malus": 0}) == []
+
+
+def test_bonus_et_malus_nuls():
+    assert (
+        BulletinGeneratorStandardBUT.affichage_bonus_malus({"bonus": 0, "malus": 0})
+        == []
+    )
+
+
+def test_vrai_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({"malus": 0.1}) == [
+        "Malus: 0.1"
+    ]
+
+
+def test_bonus_sport_et_vrai_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus(
+        {"malus": 0.12, "bonus": 0.23}
+    ) == [
+        "Bonus: 0.23",
+        "Malus: 0.12",
+    ]
+
+
+def test_bonus_sport_seul():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({"bonus": 0.5}) == [
+        "Bonus: 0.5"
+    ]
+
+
+def test_bonus_sport_nul_et_vrai_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus(
+        {"bonus": 0, "malus": 0.5}
+    ) == ["Malus: 0.5"]
+
+
+def test_bonus_sport_et_malus_nul():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus(
+        {"bonus": 0.5, "malus": 0}
+    ) == [
+        "Bonus: 0.5",
+    ]
+
+
+def test_faux_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus({"malus": -0.6}) == [
+        "Bonus: 0.6"
+    ]
+
+
+def test_sport_nul_faux_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus(
+        {"bonus": 0, "malus": -0.6}
+    ) == ["Bonus: 0.6"]
+
+
+def test_bonus_sport_et_faux_malus():
+    assert BulletinGeneratorStandardBUT.affichage_bonus_malus(
+        {"bonus": 0.3, "malus": -0.6}
+    ) == [
+        "Bonus sport/culture: 0.3",
+        "Bonus autres: 0.6",
+    ]