changes to increase test branch coverage

atst/models/permission_set.py

@@ -1,6 +1,5 @@
 from sqlalchemy import String, Column
 from sqlalchemy.dialects.postgresql import ARRAY
-from sqlalchemy.orm.attributes import flag_modified
 
 from atst.models import Base, types, mixins
 
@@ -14,18 +13,6 @@ class PermissionSet(Base, mixins.TimestampsMixin):
     description = Column(String, nullable=False)
     permissions = Column(ARRAY(String), index=True, server_default="{}", nullable=False)
 
-    def add_permission(self, permission):
-        perms_set = set(self.permissions)
-        perms_set.add(permission)
-        self.permissions = list(perms_set)
-        flag_modified(self, "permissions")
-
-    def remove_permission(self, permission):
-        perms_set = set(self.permissions)
-        perms_set.discard(permission)
-        self.permissions = list(perms_set)
-        flag_modified(self, "permissions")
-
     def __repr__(self):
         return "<PermissionSet(name='{}', description='{}', permissions='{}', id='{}')>".format(
             self.name, self.description, self.permissions, self.id