Unit test intervention forms

* adds unit test for new/edit intervention forms
* improves code base for generating new identifiers

compensation/models/compensation.py

@@ -10,6 +10,7 @@ import shutil
 from django.contrib import messages
 
 from codelist.models import KonovaCode
+from compensation.settings import COMPENSATION_IDENTIFIER_TEMPLATE, COMPENSATION_IDENTIFIER_LENGTH
 from user.models import User, Team
 from django.db import models, transaction
 from django.db.models import QuerySet, Sum
@@ -296,6 +297,9 @@ class Compensation(AbstractCompensation, CEFMixin, CoherenceMixin, PikMixin):
 
     objects = CompensationManager()
 
+    identifier_length = COMPENSATION_IDENTIFIER_LENGTH
+    identifier_template = COMPENSATION_IDENTIFIER_TEMPLATE
+
     def __str__(self):
         return "{}".format(self.identifier)