diff --git a/core/tests/Drupal/FunctionalTests/Installer/InstallerExistingSettingsTest.php b/core/tests/Drupal/FunctionalTests/Installer/InstallerExistingSettingsTest.php
index f5fb5dc225..141f047a3c 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/InstallerExistingSettingsTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/InstallerExistingSettingsTest.php
@@ -54,6 +54,17 @@ protected function prepareEnvironment() {
     mkdir($this->settings['settings']['config_sync_directory']->value, 0777, TRUE);
   }
 
+  /**
+   * Visits the interactive installer.
+   */
+  protected function visitInstaller() {
+    // Should redirect to the installer.
+    $this->drupalGet($GLOBALS['base_url']);
+    // Ensure no database tables have been created yet.
+    $this->assertSame([], Database::getConnection()->schema()->findTables('%'));
+    $this->assertSession()->addressEquals($GLOBALS['base_url'] . '/core/install.php');
+  }
+
   /**
    * {@inheritdoc}
    */