Rename e2e to integration

tests/integration/PHPUnit/TestCase.php

@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Tests\Integration;
+
+use WooCommerce\PayPalCommerce\PPCP;
+use WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface;
+use WC_Cart;
+use WC_Customer;
+use WC_Session;
+
+class TestCase extends \PHPUnit\Framework\TestCase
+{
+	protected $container;
+
+	protected function getContainer(): ContainerInterface {
+		return PPCP::container();
+	}
+
+	protected function cart(): WC_Cart {
+		return WC()->cart;
+	}
+
+	protected function customer(): WC_Customer {
+		return WC()->customer;
+	}
+
+	protected function session(): WC_Session {
+		return WC()->session;
+	}
+}