define constants for membership types

shared/selene/data/account/__init__.py

@@ -9,5 +9,9 @@ from .entity.membership import Membership
 from .entity.skill import AccountSkill
 from .repository.account import AccountRepository
 from .repository.agreement import AgreementRepository
-from .repository.membership import MembershipRepository
+from .repository.membership import (
+    MembershipRepository,
+    MONTHLY_MEMBERSHIP,
+    YEARLY_MEMBERSHIP
+)
 from .repository.skill import AccountSkillRepository

shared/selene/data/account/repository/membership.py

@@ -2,6 +2,9 @@ from selene.data.account import AccountMembership
 from ..entity.membership import Membership
 from ...repository_base import RepositoryBase
 
+MONTHLY_MEMBERSHIP = 'Monthly Membership'
+YEARLY_MEMBERSHIP = 'Yearly Membership'
+
 
 class MembershipRepository(RepositoryBase):
     def __init__(self, db):

shared/selene/testing/membership.py

@@ -1,15 +1,20 @@
 from decimal import Decimal
 
-from selene.data.account import Membership, MembershipRepository
+from selene.data.account import (
+    Membership,
+    MembershipRepository,
+    MONTHLY_MEMBERSHIP,
+    YEARLY_MEMBERSHIP
+)
 
 monthly_membership = dict(
-    type='Monthly Supporter',
+    type=MONTHLY_MEMBERSHIP,
     rate=Decimal('1.99'),
     rate_period='monthly'
 )
 
 yearly_membership = dict(
-    type='Yearly Supporter',
+    type=YEARLY_MEMBERSHIP,
     rate=Decimal('19.99'),
     rate_period='yearly'
 )