--- /dev/null
+<?php
+
+namespace Drupal\TestSite;
+
+/**
+ * Setup file used by TestSiteApplicationTest.
+ *
+ * @see \Drupal\Tests\Scripts\TestSiteApplicationTest
+ */
+class TestSiteInstallTestScript implements TestSetupInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setup() {
+ \Drupal::service('module_installer')->install(['test_page_test']);
+ }
+
+}