diff --git a/tests/CartTest.php b/tests/CartTest.php
index 4aad168..2e75695 100644
--- a/tests/CartTest.php
+++ b/tests/CartTest.php
@@ -70,16 +70,6 @@ class CartTest extends TestCase
         });
     }
 
-    /** @test */
-    public function i_am_not_insane()
-    {
-        $cart = $this->getCart();
-
-        $price = new Money(1000, new Currency('USD'));
-
-        $this->assertEquals(new Money(210, new Currency('USD')), $price->multiply(0.21));
-    }
-
     /** @test */
     public function it_has_a_default_instance()
     {
@@ -538,10 +528,7 @@ class CartTest extends TestCase
         
         $this->assertEquals(new Money(1000, $cartItem->price->getCurrency()), $cartItem->price());
         $this->assertEquals(new Money(1000, $cartItem->price->getCurrency()), $cartItem->subtotal());
-        $this->assertEquals(0.21, config('cart.tax'));
-        $this->assertEquals(0.21, $cartItem->taxRate);
-        $this->assertEquals(new Money(210, $cartItem->price->getCurrency()), $cartItem->subtotal()->multiply($cartItem->taxRate), config('cart.rounding', Money::ROUND_UP), 'Could not calculate tax manually');
-        $this->assertEquals(new Money(210, $cartItem->price->getCurrency()), $cartItem->tax(), 'Could not calculate tax on CartItem');
+        $this->assertEquals(new Money(210, $cartItem->price->getCurrency()), $cartItem->tax());
         $this->assertEquals(new Money(1210, $cartItem->price->getCurrency()), $cartItem->total());
 
         $content = $cart->content();