diff --git a/database/migrations/0000_00_00_000000_create_shoppingcart_table.php b/database/migrations/2018_12_23_120000_create_shoppingcart_table.php
similarity index 100%
rename from database/migrations/0000_00_00_000000_create_shoppingcart_table.php
rename to database/migrations/2018_12_23_120000_create_shoppingcart_table.php
diff --git a/src/Cart.php b/src/Cart.php
index c3ee405..8df2a57 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -459,8 +459,10 @@ class Cart
     public function setGlobalTax($taxRate)
     {
         $this->taxRate = $taxRate;
-        if ($this->content && $this->content->count()) {
-            $this->content->each(function ($item, $key) {
+        
+        $content = $this->getContent();
+        if ($content && $content->count()) {
+            $content->each(function ($item, $key) {
                 $item->setTaxRate($this->taxRate);
             });
         }
@@ -495,8 +497,10 @@ class Cart
     public function setGlobalDiscount($discount)
     {
         $this->discount = $discount;
-        if ($this->content && $this->content->count()) {
-            $this->content->each(function ($item, $key) {
+
+        $content = $this->getContent();
+        if ($content && $content->count()) {
+            $content->each(function ($item, $key) {
                 $item->setDiscountRate($this->discount);
             });
         }
diff --git a/src/ShoppingcartServiceProvider.php b/src/ShoppingcartServiceProvider.php
index 979f579..691df87 100644
--- a/src/ShoppingcartServiceProvider.php
+++ b/src/ShoppingcartServiceProvider.php
@@ -29,13 +29,8 @@ class ShoppingcartServiceProvider extends ServiceProvider
             }
         });
 
-        if ( ! class_exists('CreateShoppingcartTable')) {
-            // Publish the migration
-            $timestamp = date('Y_m_d_His', time());
-
-            $this->publishes([
-                __DIR__.'/../database/migrations/0000_00_00_000000_create_shoppingcart_table.php' => database_path('migrations/'.$timestamp.'_create_shoppingcart_table.php'),
-            ], 'migrations');
-        }
+        $this->publishes([
+            realpath(__DIR__.'/../database/migrations') => $this->app->databasePath().'/migrations'
+        ]);
     }
 }
diff --git a/tests/CartTest.php b/tests/CartTest.php
index 6fa4d36..213ab84 100644
--- a/tests/CartTest.php
+++ b/tests/CartTest.php
@@ -920,6 +920,47 @@ class CartTest extends TestCase
         event(new Logout(\Auth::guard('web'), $user));
     }
 
+    /** @test */
+    public function can_change_tax_globally()
+    {
+        $cart = $this->getCart();
+
+        $cart->add( new BuyableProduct(1, 'Item', 10.00), 2);
+
+        $cart->setGlobalTax(0);
+
+        $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
+
+        $this->assertEquals('20.00', $cartItem->total(2));
+    }
+
+    /** @test */
+    public function can_change_discount_globally()
+    {
+        $cart = $this->getCart();
+
+        $cart->add( new BuyableProduct(1, 'Item', 10.00), 2);
+
+        $cart->setGlobalTax(0);
+        $cart->setGlobalDiscount(50);
+
+        $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
+
+        $this->assertEquals('10.00', $cartItem->total(2));
+    }
+
+    /** @test */
+    public function cart_hast_no_rounding_errors()
+    {
+        $cart = $this->getCart();
+
+        $cart->add( new BuyableProduct(1, 'Item', 10.004), 2);
+
+        $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
+
+        $this->assertEquals('24.21', $cartItem->total(2));
+    }
+
     /**
      * Get an instance of the cart.
      *