public function get_cart_item_errors() {
    $errors     = [];
    $cart_items = $this->get_cart_items();

    $too_many_in_cart_exceptions     = [];
    $not_purchasable_exceptions      = [];
    $partial_out_of_stock_exceptions = [];
    $out_of_stock_exceptions         = [];

    foreach ( $cart_items as $cart_item_key => $cart_item ) {
      try {
        $this->validate_cart_item( $cart_item );
      } catch ( RouteException $error ) {
        $errors[] = new WP_Error( $error->getErrorCode(), $error->getMessage() );
      } catch ( TooManyInCartException $error ) {
        $too_many_in_cart_exceptions[] = $error;
      } catch ( NotPurchasableException $error ) {
        $not_purchasable_exceptions[] = $error;
      } catch ( PartialOutOfStockException $error ) {
        $partial_out_of_stock_exceptions[] = $error;
      } catch ( OutOfStockException $error ) {
        $out_of_stock_exceptions[] = $error;
      }
    }

    if ( count( $errors ) > 0 ) {
      return $errors;
    }

    return $this->stock_exceptions_to_wp_errors( $too_many_in_cart_exceptions, $not_purchasable_exceptions, $partial_out_of_stock_exceptions, $out_of_stock_exceptions );
  }