diff --git a/stages/test_files/CLOEE2_Export_FE_2018.xlsx b/stages/test_files/CLOEE2_Export_FE_2018.xlsx
index 3de7548..c3cdb38 100644
Binary files a/stages/test_files/CLOEE2_Export_FE_2018.xlsx and b/stages/test_files/CLOEE2_Export_FE_2018.xlsx differ
diff --git a/stages/tests.py b/stages/tests.py
index ef342da..bfd0371 100644
--- a/stages/tests.py
+++ b/stages/tests.py
@@ -441,40 +441,44 @@ class ImportTests(TestCase):
         """
         Import of the main students file.
         """
+        lev1 = Level.objects.create(name='1')
+        lev2 = Level.objects.create(name='2')
+        assc = Section.objects.create(name='ASSC')
+        k1 = Klass.objects.create(name='1ASSCFEa', section=assc, level=lev1)
+        # An existing student, klass should be changed.
+        Student.objects.create(ext_id=11111, first_name="Séraphin", last_name="Lampion", klass=k1)
+
         path = os.path.join(os.path.dirname(__file__), 'test_files', 'CLOEE2_Export_FE_2018.xlsx')
         self.client.login(username='me', password='mepassword')
         with open(path, 'rb') as fh:
             response = self.client.post(reverse('import-students'), {'upload': fh}, follow=True)
         msg = "\n".join(str(m) for m in response.context['messages'])
-        self.assertIn("La classe '1ASSCFEa' n'existe pas encore", msg)
+        self.assertIn("La classe '2ASSCFEa' n'existe pas encore", msg)
 
-        lev1 = Level.objects.create(name='1')
-        lev2 = Level.objects.create(name='2')
-        Klass.objects.create(
-            name='1ASSCFEa',
-            section=Section.objects.create(name='ASSC'),
-            level=lev1,
-        )
+        Klass.objects.create(name='2ASSCFEa', section=assc, level=lev2)
         Klass.objects.create(
             name='2EDEpe',
             section=Section.objects.create(name='EDE'),
             level=lev2,
         )
         Klass.objects.create(
-            name='1EDS18-20',
+            name='2EDS18-20',
             section=Section.objects.create(name='EDS'),
-            level=lev1,
+            level=lev2,
         )
         with open(path, 'rb') as fh:
             response = self.client.post(reverse('import-students'), {'upload': fh}, follow=True)
         msg = "\n".join(str(m) for m in response.context['messages'])
-        self.assertIn("Objets créés : 3", msg)
+        self.assertIn("Objets créés : 2", msg)
+        self.assertIn("Objets modifiés : 1", msg)
 
-        student = Student.objects.get(ext_id=22222)
-        self.assertEqual(student.corporation.name, 'Accueil Haut les mains')
-        self.assertFalse(student.dispense_eps)
+        student1 = Student.objects.get(ext_id=11111)
+        self.assertEqual(student1.klass.name, '2ASSCFEa')
+        student2 = Student.objects.get(ext_id=22222)
+        self.assertEqual(student2.corporation.name, 'Accueil Haut les mains')
+        self.assertFalse(student2.dispense_eps)
         # Instructor not set through this import
-        self.assertIsNone(student.instructor)
+        self.assertIsNone(student2.instructor)
 
     def test_import_hp(self):
         teacher = Teacher.objects.create(