Re-organise the src and tests directories

tests/ValueObject/CustomerTest.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Opdavies\Glassboxx\Tests\ValueObject;
+
+use Opdavies\Glassboxx\Tests\TestCase;
+use Opdavies\Glassboxx\ValueObject\Customer;
+
+final class CustomerTest extends TestCase
+{
+    public function testCreatingACustomer(): void
+    {
+        $customer = new Customer(
+            'Oliver',
+            'Davies',
+            'oliver@oliverdavies.uk'
+        );
+
+        $this->assertSame('Oliver', $customer->getFirstName());
+        $this->assertSame('Davies', $customer->getLastName());
+        $this->assertSame('oliver@oliverdavies.uk', $customer->getEmailAddress());
+    }
+}

tests/ValueObject/OrderTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Opdavies\Glassboxx\Tests\ValueObject;
+
+use Opdavies\Glassboxx\Tests\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,
+            '123',
+            'GBP'
+        );
+
+        $this->assertSame('GBP', $order->getCurrencyCode());
+        $this->assertSame($customer, $order->getCustomer());
+        $this->assertSame('123', $order->getOrderNumber());
+    }
+}