Fix kfet tests

- and add test for `kfet_config.subvention_cof`

kfet/tests/test_config.py

@@ -22,13 +22,20 @@ class ConfigTest(TestCase):
     def test_get(self):
         self.assertTrue(hasattr(kfet_config, 'subvention_cof'))
 
+    def test_subvention_cof(self):
+        reduction_cof = Decimal('20')
+        subvention_cof = Decimal('25')
+        kfet_config.set(reduction_cof=reduction_cof)
+
+        self.assertEqual(kfet_config.subvention_cof, subvention_cof)
+
     def test_set_decimal(self):
         """Test field of decimal type."""
-        subvention_cof = Decimal('10')
+        reduction_cof = Decimal('10')
         # IUT
-        kfet_config.set(subvention_cof=subvention_cof)
+        kfet_config.set(reduction_cof=reduction_cof)
         # check
-        self.assertEqual(kfet_config.subvention_cof, subvention_cof)
+        self.assertEqual(kfet_config.reduction_cof, reduction_cof)
 
     def test_set_modelinstance(self):
         """Test field of model instance type."""

kfet/tests/test_statistic.py

@@ -5,7 +5,7 @@ from unittest.mock import patch
 from django.test import TestCase, Client
 from django.contrib.auth.models import User, Permission
 
-from .models import Account, Article, ArticleCategory
+from kfet.models import Account, Article, ArticleCategory
 
 
 class TestStats(TestCase):