#31 API Deductions Tests

* adds tests for deduction API

intervention/tests/test_workflow.py

@@ -360,19 +360,21 @@ class InterventionWorkflowTestCase(BaseWorkflowTestCase):
             self.eco_account.recorded = rec_action
         self.eco_account.share_with_list([self.superuser])
         self.eco_account.save()
+        num_all_deducs = EcoAccountDeduction.objects.count()
 
         # Run the request
         self.client_user.post(new_url, post_data)
 
         # Expect the deduction to be created, since all constraints are fulfilled
         self.assertEqual(1, self.eco_account.deductions.count())
-        self.assertEqual(1, EcoAccountDeduction.objects.count())
+        self.assertEqual(num_all_deducs + 1, EcoAccountDeduction.objects.count())
 
         # Make sure the deduction contains the expected data
-        deduction = EcoAccountDeduction.objects.first()
+        deduction = EcoAccountDeduction.objects.get(
+            account=self.eco_account,
+            intervention=self.intervention
+        )
         self.assertEqual(deduction.surface, test_surface)
-        self.assertEqual(deduction.intervention, self.intervention)
-        self.assertEqual(deduction.account, self.eco_account)
 
         # Return deduction for further usage in tests
         return deduction