Adds spec to assert no relationship is duplicated
Adds spec to assert no relationship is duplicated

mediasuitenz/ember-sync,kurko/ember-sync,kurko/ember-sync,kurko/ember-sync,mediasuitenz/ember-sync,greyhwndz/ember-sync,mediasuitenz/ember-sync,greyhwndz/ember-sync,greyhwndz/ember-sync