test: auth_fc updates the user email with FC info (#45199)

tests/auth_fc/test_auth_fc.py

@@ -574,3 +574,43 @@ def test_same_email_different_sub(app, franceconnect):
     # email collision, sub is different, no new user created
     assert User.objects.count() == 1
     assert 'another email address' in resp
+
+
+def test_update_fc_email(settings, app, franceconnect):
+    settings.A2_EMAIL_IS_UNIQUE = True
+    user = User(email='john.doe@example.com', first_name='John', last_name='Doe')
+    user.save()
+    models.FcAccount.objects.create(user=user, sub='1234')
+
+    # user1 FC email has changed
+    assert franceconnect.sub == '1234'
+    assert franceconnect.user_info['given_name'] == 'Ÿuñe'
+    franceconnect.user_info['email'] = 'jhonny@example.com'
+
+    # connection using FC sub 1234 will update user1 email
+    franceconnect.login_with_fc_fixed_params(app)
+    assert User.objects.get(pk=user.pk).email == 'jhonny@example.com'
+    assert User.objects.get(pk=user.pk).first_name == 'Ÿuñe'
+    assert app.session['_auth_user_id'] == str(user.pk)
+
+
+def test_update_fc_redondant_email(settings, app, franceconnect):
+    settings.A2_EMAIL_IS_UNIQUE = True
+    user1 = User(email='john.doe@example.com', first_name='John', last_name='Doe')
+    user1.save()
+    models.FcAccount.objects.create(user=user1, sub='1234')
+    user2 = User(email='joe@example.com', first_name='Joe', last_name='Dalton')
+    user2.save()
+    models.FcAccount.objects.create(user=user2, sub='4567')
+
+    # user1 FC email has changed and provide user2 email
+    assert franceconnect.sub == '1234'
+    assert franceconnect.user_info['given_name'] == 'Ÿuñe'
+    franceconnect.user_info['email'] = 'joe@example.com'
+
+    # connection using FC sub 1234 will introduce a redondant mail
+    franceconnect.login_with_fc_fixed_params(app)
+    assert User.objects.get(pk=user1.pk).email == 'joe@example.com'
+    assert User.objects.get(pk=user1.pk).first_name == 'Ÿuñe'
+    assert User.objects.get(pk=user2.pk).email == 'joe@example.com'
+    assert app.session['_auth_user_id'] == str(user1.pk)