Removed Cart facade from coverage (does not provide a public inteterface)

Exclude migrations from coverage
Added tests for InstanceIdentifier
Added InstanceIdentifier support to store, restore and merge
Added weight to CanBeBought trait
Excluded CanBeBought trait from coverage temporarily

tests/CartTest.php

@@ -15,6 +15,7 @@ use Illuminate\Contracts\Auth\Authenticatable;
 use Gloudemans\Shoppingcart\ShoppingcartServiceProvider;
 use Gloudemans\Tests\Shoppingcart\Fixtures\ProductModel;
 use Gloudemans\Tests\Shoppingcart\Fixtures\BuyableProduct;
+use Gloudemans\Tests\Shoppingcart\Fixtures\Identifiable;
 
 class CartTest extends TestCase
 {
@@ -1066,6 +1067,33 @@ class CartTest extends TestCase
         $this->assertEquals('500.00', $cart->weight(2));
         $this->assertEquals(500.00, $cart->weightFloat());
         $this->assertEquals(500.00, $cartItem->weightTotal);
+        $this->assertEquals('250.00', $cartItem->weight(2));
+    }
+
+    /** @test */
+    public function cart_can_create_and_restore_from_instance_identifier()
+    {
+        $this->artisan('migrate', [
+            '--database' => 'testing',
+        ]);
+
+        Event::fake();
+
+        $identifier = new Identifiable('User1', 0);
+        $cart = $this->getCart();
+
+        $cart->instance($identifier);
+        $this->assertEquals('User1', $cart->currentInstance());
+
+        $cart->add(new BuyableProduct(1, 'First item', 10.00, 250), 2);
+        $this->assertItemsInCart(2, $cart);
+
+        $cart->store($identifier);
+        $cart->destroy();
+        $this->assertItemsInCart(0, $cart);
+
+        $cart->restore($identifier);
+        $this->assertItemsInCart(2, $cart);
     }
 
     /**

tests/Fixtures/Identifiable.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Gloudemans\Tests\Shoppingcart\Fixtures;
+
+use Gloudemans\Shoppingcart\Contracts\InstanceIdentifier;
+
+class Identifiable implements InstanceIdentifier
+{
+    /**
+     * @var int|string
+     */
+    private $identifier;
+
+    /**
+     * @var int
+     */
+    private $discountRate;
+
+    /**
+     * BuyableProduct constructor.
+     *
+     * @param int|string $id
+     * @param string     $name
+     * @param float      $price
+     */
+    public function __construct($identifier = 'identifier', $discountRate = 0)
+    {
+        $this->identifier = $identifier;
+        $this->discountRate = $discountRate;
+    }
+
+    /**
+     * Get the unique identifier to load the Cart from
+     *
+     * @return int|string
+     */
+    public function getInstanceIdentifier($options = null)
+    {
+        return $this->identifier;
+    }
+
+    /**
+     * Get the unique identifier to load the Cart from
+     *
+     * @return int|string
+     */
+    public function getInstanceGlobalDiscount($options = null)
+    {
+        return $this->discountRate;
+    }
+}