--- /dev/null
+<?php
+
+namespace Unish;
+
+use Webmozart\PathUtil\Path;
+
+/**
+ * Tests the Drush override of DrupalKernel.
+ *
+ * @group base
+ *
+ * @see https://github.com/drush-ops/drush/issues/3123
+ */
+class ContainerTest extends CommandUnishTestCase
+{
+ use TestModuleHelperTrait;
+
+ /**
+ * Tests that the existing container is available while Drush rebuilds it.
+ */
+ public function testContainer()
+ {
+ $this->setUpDrupal(1, true);
+
+ // Copy the 'woot' module over to the Drupal site we just set up.
+ $this->setupModulesForTests(['woot'], Path::join(__DIR__, 'resources/modules/d8'));
+
+ // Enable our module.
+ $this->drush('pm-enable', ['woot']);
+
+ // Set up for a config import with just one small piece.
+ $this->drush('config-export');
+ $this->drush('config-set', ['system.site', 'name', 'config_test']);
+
+ // Trigger the container rebuild we need.
+ $this->drush('cr');
+
+ // If the event was registered successfully, then upon a config import, we
+ // should get the error message.
+ $this->drush('config-import', [], [], null, null, CommandUnishTestCase::EXIT_ERROR);
+ $this->assertContains("woot config error", $this->getErrorOutput(), 'Event was successfully registered.');
+ }
+}