message: Fix id check in `tests/subscription`
diff: @@ -35,7 +35,7 @@ fn is_subscription_expandable() {
  Err(err) => panic!("{}", err),
  Ok(ok) => ok,
  };
  - assert_eq!(subscription.id, "ch_123");
  + assert_eq!(subscription.id, "sub_123");
  assert!(subscription.customer.is_object());
  });
  }
  