Issue #3115903 by alexpott, Berdir: Remove test cruft from TestSiteInstallCommand

core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php

@@ -200,9 +200,6 @@ protected function installDrupal() {
     $this->initSettings();
     $container = $this->initKernel(\Drupal::request());
     $this->initConfig($container);
-    $this->installDefaultThemeFromClassProperty($container);
-    $this->installModulesFromClassProperty($container);
-    $this->rebuildAll();
   }
 
   /**