diff --git a/tests/CartItemTest.php b/tests/CartItemTest.php
index 7c24ea9..4261f10 100644
--- a/tests/CartItemTest.php
+++ b/tests/CartItemTest.php
@@ -38,9 +38,9 @@ class CartItemTest extends TestCase
                 'size'  => 'XL',
                 'color' => 'red',
             ],
-            'tax'      => 0,
-            'subtotal' => 20.00,
-            'discount' => 0.0,
+            'tax'      => '0.00',
+            'subtotal' => '20.00',
+            'discount' => '0.00',
             'weight'   => 550,
         ], $cartItem->toArray());
     }
@@ -52,7 +52,7 @@ class CartItemTest extends TestCase
 
         $this->assertJson($cartItem->toJson());
 
-        $json = '{"rowId":"07d5da5550494c62daf9993cf954303f","id":1,"name":"Some item","qty":2,"price":10.00,"weight":550,"options":{"size":"XL","color":"red"},"discount":0,"tax":0,"subtotal":20}';
+        $json = '{"rowId":"07d5da5550494c62daf9993cf954303f","id":1,"name":"Some item","qty":2,"price":10.00,"weight":550,"options":{"size":"XL","color":"red"},"discount":"0.00","tax":"10.00","subtotal":"20.00"}';
 
         $this->assertEquals($json, $cartItem->toJson());
     }