#19 Tests

* adds tests for compensations (WIP)
* refactors some dummy data generating into base test class
* fixes bugs detected by testing
* adds important requirements.txt change for itsdangerous package (<1.0.0 for compatibility to django-simple-sso)

compensation/models.py

@@ -229,6 +229,19 @@ class Compensation(AbstractCompensation):
             self.identifier = self.generate_new_identifier()
         super().save(*args, **kwargs)
 
+    def is_shared_with(self, user: User):
+        """ Access check
+
+        Checks whether a given user has access to this object
+
+        Args:
+            user ():
+
+        Returns:
+
+        """
+        return self.intervention.users.filter(id=user.id)
+
     def get_LANIS_link(self) -> str:
         """ Generates a link for LANIS depending on the geometry