Add order and order request classes

References #3

tests/Glassboxx/ValueObject/OrderTest.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Opdavies\Glassboxx\Tests\Glassboxx\ValueObject;
+
+use Opdavies\Glassboxx\Tests\Glassboxx\TestCase;
+use Opdavies\Glassboxx\ValueObject\Customer;
+use Opdavies\Glassboxx\ValueObject\CustomerInterface;
+use Opdavies\Glassboxx\ValueObject\Order;
+
+class OrderTest extends TestCase
+{
+    public function testCreatingAnOrder(): void
+    {
+        $customer = $this->getMockBuilder(CustomerInterface::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $order = new Order(
+            $customer,
+            'this-is-the-sku',
+            '123',
+            'GBP',
+            10.00
+        );
+
+        $this->assertSame('GBP', $order->getCurrencyCode());
+        $this->assertSame($customer, $order->getCustomer());
+        $this->assertSame('123', $order->getOrderNumber());
+        $this->assertSame(10.0, $order->getPrice());
+        $this->assertSame('this-is-the-sku', $order->getSku());
+    }
+}