--- /dev/null
+<?php
+
+namespace Drupal\system\Tests\Installer;
+
+use Drupal\Core\DrupalKernel;
+use Drupal\simpletest\InstallerTestBase;
+use Drupal\Core\Database\Database;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Tests the installer with an existing settings file but no install profile.
+ *
+ * @group Installer
+ */
+class InstallerExistingSettingsNoProfileTest extends InstallerTestBase {
+
+ /**
+ * {@inheritdoc}
+ *
+ * Configures a preexisting settings.php file without an install_profile
+ * setting before invoking the interactive installer.
+ */
+ protected function setUp() {
+ // Pre-configure hash salt.
+ // Any string is valid, so simply use the class name of this test.
+ $this->settings['settings']['hash_salt'] = (object) [
+ 'value' => __CLASS__,
+ 'required' => TRUE,
+ ];
+
+ // Pre-configure database credentials.
+ $connection_info = Database::getConnectionInfo();
+ unset($connection_info['default']['pdo']);
+ unset($connection_info['default']['init_commands']);
+
+ $this->settings['databases']['default'] = (object) [
+ 'value' => $connection_info,
+ 'required' => TRUE,
+ ];
+
+ // Pre-configure config directories.
+ $this->settings['config_directories'] = [
+ CONFIG_SYNC_DIRECTORY => (object) [
+ 'value' => DrupalKernel::findSitePath(Request::createFromGlobals()) . '/files/config_sync',
+ 'required' => TRUE,
+ ],
+ ];
+ mkdir($this->settings['config_directories'][CONFIG_SYNC_DIRECTORY]->value, 0777, TRUE);
+
+ parent::setUp();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUpSettings() {
+ // This step should not appear, since settings.php is fully configured
+ // already.
+ }
+
+ /**
+ * Verifies that installation succeeded.
+ */
+ public function testInstaller() {
+ $this->assertUrl('user/1');
+ $this->assertResponse(200);
+ $this->assertEqual('testing', \Drupal::installProfile());
+ }
+
+}