From ae0a976785e45e53fe6a29f08e03fc0fb4331a57 Mon Sep 17 00:00:00 2001
From: Patrick <privat@skyraptor.eu>
Date: Sat, 29 Aug 2020 15:47:33 +0200
Subject: [PATCH] Prevent negative subtotal

Manual merge of https://github.com/iainheng/LaravelShoppingcart/commit/33fc42dae115089221f01c2a6a27506b14f763c4
---
 src/CartItem.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/CartItem.php b/src/CartItem.php
index 0bf3a8d..675371b 100644
--- a/src/CartItem.php
+++ b/src/CartItem.php
@@ -412,7 +412,7 @@ class CartItem implements Arrayable, Jsonable
                 case 'priceTotal':
                     return round($this->priceNet * $this->qty, $decimals);
                 case 'subtotal':
-                    return round($this->priceTotal - $this->discountTotal, $decimals);
+                    return max(round($this->priceTotal - $this->discountTotal, $decimals), 0);
                 case 'priceTarget':
                     return round(($this->priceTotal - $this->discountTotal) / $this->qty, $decimals);
                 case 'taxTotal':
@@ -435,7 +435,7 @@ class CartItem implements Arrayable, Jsonable
                 case 'priceTotal':
                     return round($this->price * $this->qty, $decimals);
                 case 'subtotal':
-                    return round($this->priceTotal - $this->discountTotal, $decimals);
+                    return max(round($this->priceTotal - $this->discountTotal, $decimals), 0);
                 case 'priceTarget':
                     return round(($this->priceTotal - $this->discountTotal) / $this->qty, $decimals);
                 case 'taxTotal':