specify unit for invitation expiration

atst/domain/invitations.py

@@ -17,7 +17,8 @@ class InvitationExpired(Exception):
 
 
 class Invitations(object):
-    EXPIRATION_LIMIT = 360
+    # number of minutes a given invitation is considered valid
+    EXPIRATION_LIMIT_MINUTES = 360
 
     @classmethod
     def _get(cls, invite_id):
@@ -58,6 +59,6 @@ class Invitations(object):
     def is_expired(cls, invite):
         time_created = invite.time_created
         expiration = datetime.datetime.now(time_created.tzinfo) - datetime.timedelta(
-            minutes=Invitations.EXPIRATION_LIMIT
+            minutes=Invitations.EXPIRATION_LIMIT_MINUTES
         )
         return invite.time_created < expiration

tests/domain/test_invitations.py

@@ -27,7 +27,7 @@ def test_accept_invitation():
 def test_accept_expired_invitation():
     workspace = WorkspaceFactory.create()
     user = UserFactory.create()
-    increment = Invitations.EXPIRATION_LIMIT + 1
+    increment = Invitations.EXPIRATION_LIMIT_MINUTES + 1
     created_at = datetime.datetime.now() - datetime.timedelta(minutes=increment)
     invite = InvitationFactory.create(
         workspace_id=workspace.id, user_id=user.id, time_created=created_at, valid=True