diff --git a/app/scodoc/sco_formsemestre.py b/app/scodoc/sco_formsemestre.py
index fc49f4330..38b0e9cb9 100644
--- a/app/scodoc/sco_formsemestre.py
+++ b/app/scodoc/sco_formsemestre.py
@@ -493,7 +493,7 @@ def sem_in_semestre_scolaire(
         jour_pivot_periode,
         mois_pivot_periode,
     )
-    if periode == 0 or None:
+    if periode is None or periode == 0:
         return sem_annee == year
     else:
         return sem_annee == year and sem_periode == periode
diff --git a/tests/unit/test_periode.py b/tests/unit/test_periode.py
index 91c60c916..fbc90d3c3 100644
--- a/tests/unit/test_periode.py
+++ b/tests/unit/test_periode.py
@@ -7,7 +7,7 @@ Utiliser comme:
 """
 import datetime
 
-from app.scodoc.sco_formsemestre import get_periode
+from app.scodoc.sco_formsemestre import get_periode, sem_in_semestre_scolaire
 
 """ Calcule la session associée à un formsemestre sous la forme (année, période)
 année: première année de l'année scolaire
@@ -32,30 +32,86 @@ Début FormSemestre    pivot_année   pivot_periode     Résultat
 """
 
 
-def test_general():
-    # A with default
+def test_default():
+    # with default
     assert (2021, 2) == get_periode(datetime.datetime(2022, 1, 1))
-    # A
     assert (2021, 2) == get_periode(datetime.datetime(2022, 1, 1), 1, 8, 1, 12)
-    # automne nord
+
+
+def test_automne_nord():
     assert (2022, 1) == get_periode(datetime.datetime(2022, 9, 1))
-    # noel nord
+
+
+def test_noel_nord():
     assert (2022, 2) == get_periode(datetime.datetime(2022, 12, 15))
-    # été nord
+
+
+def test_étét_nord():
     assert (2021, 2) == get_periode(datetime.datetime(2022, 7, 30))
-    # printemps sud
+
+
+def test_printemps_sud():
     assert (2022, 1) == get_periode(datetime.datetime(2022, 1, 1), 1, 1, 1, 8)
-    # automne sud
+
+
+def test_automne_sud():
     assert (2022, 2) == get_periode(datetime.datetime(2022, 8, 2), 1, 1, 1, 8)
-    # noel sud
+
+
+def test_noel_sud():
     assert (2022, 2) == get_periode(datetime.datetime(2022, 12, 30), 1, 1, 1, 8)
-    # été sud
+
+
+def test_été_sud():
     assert (2022, 1) == get_periode(datetime.datetime(2022, 7, 30), 1, 1, 1, 8)
-    # nouvel an sud
+
+
+def test_nouvel_an_sud():
     assert (2021, 2) == get_periode(datetime.datetime(2022, 1, 1), 3, 1, 1, 8)
-    # nouvel an pp < pa
+
+
+def test_nouvel_an_special_pp_before_pa():
     assert (2023, 1) == get_periode(datetime.datetime(2024, 1, 10), 1, 8, 1, 2)
-    # été pivot pp<pa
+
+
+def test_nouvel_été_pp_before_pa():
     assert (2023, 2) == get_periode(datetime.datetime(2024, 6, 1), 1, 8, 1, 2)
-    # automne pp<pa
+
+
+def test_automne_special_pp_before_pa():
     assert (2024, 1) == get_periode(datetime.datetime(2024, 9, 20), 1, 8, 1, 2)
+
+
+sem_automne = {"date_debut_iso": "2022-09-24"}
+sem_nouvel_an = {"date_debut_iso": "2023-01-01"}
+sem_printemps = {"date_debut_iso": "2023-03-14"}
+sem_été = {"date_debut_iso": "2023-07-11"}
+sem_next_year = {"date_debut_iso": "2023-08-16"}
+sem_prev_year = {"date_debut_iso": "2022-07-31"}
+
+
+def test_sem_in_periode1_default():
+    assert True == sem_in_semestre_scolaire(sem_automne, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_nouvel_an, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_printemps, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_été, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_next_year, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_prev_year, 2022, 1)
+
+
+def test_sem_in_periode2_default():
+    assert False == sem_in_semestre_scolaire(sem_automne, 2022, 2)
+    assert True == sem_in_semestre_scolaire(sem_nouvel_an, 2022, 2)
+    assert True == sem_in_semestre_scolaire(sem_printemps, 2022, 2)
+    assert True == sem_in_semestre_scolaire(sem_été, 2022, 2)
+    assert False == sem_in_semestre_scolaire(sem_next_year, 2022, 1)
+    assert False == sem_in_semestre_scolaire(sem_prev_year, 2022, 1)
+
+
+def test_sem_in_annee_default():
+    assert True == sem_in_semestre_scolaire(sem_automne, 2022, 0)
+    assert True == sem_in_semestre_scolaire(sem_nouvel_an, 2022)
+    assert True == sem_in_semestre_scolaire(sem_printemps, 2022, 0)
+    assert True == sem_in_semestre_scolaire(sem_été, 2022, 0)
+    assert False == sem_in_semestre_scolaire(sem_next_year, 2022)
+    assert False == sem_in_semestre_scolaire(sem_prev_year, 2022, 0)