--- /dev/null
+<?php
+
+namespace Drupal\Tests\devel\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\user\Entity\Role;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests query debug.
+ *
+ * @group devel
+ */
+class DevelQueryDebugTest extends KernelTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['devel', 'system', 'user'];
+
+ /**
+ * The user used in test.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $develUser;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->installSchema('system', 'sequences');
+ $this->installConfig(['system', 'devel']);
+ $this->installEntitySchema('user');
+
+ $devel_role = Role::create([
+ 'id' => 'admin',
+ 'permissions' => ['access devel information'],
+ ]);
+ $devel_role->save();
+
+ $this->develUser = User::create([
+ 'name' => $this->randomMachineName(),
+ 'roles' => [$devel_role->id()],
+ ]);
+ $this->develUser->save();
+ }
+
+ /**
+ * Tests devel_query_debug_alter() for select queries.
+ */
+ public function testSelectQueryDebugTag() {
+ // Clear the messages stack.
+ $this->getDrupalMessages();
+
+ // Ensures that no debug message is shown to user without the adequate
+ // permissions.
+ $query = \Drupal::database()->select('users', 'u');
+ $query->fields('u', ['uid']);
+ $query->addTag('debug');
+ $query->execute();
+
+ $messages = $this->getDrupalMessages();
+ $this->assertEmpty($messages);
+
+ // Ensures that the SQL debug message is shown to user with the adequate
+ // permissions. We expect only one status message containing the SQL for
+ // the debugged query.
+ \Drupal::currentUser()->setAccount($this->develUser);
+ $expected_message = "SELECT u.uid AS uid\nFROM \n{users} u";
+
+ $query = \Drupal::database()->select('users', 'u');
+ $query->fields('u', ['uid']);
+ $query->addTag('debug');
+ $query->execute();
+
+ $messages = $this->getDrupalMessages();
+ $this->assertTrue(!empty($messages['status']));
+ $this->assertCount(1, $messages['status']);
+ $this->assertEquals(strip_tags($messages['status'][0]), $expected_message);
+ }
+
+ /**
+ * Tests devel_query_debug_alter() for entity queries.
+ */
+ public function testEntityQueryDebugTag() {
+ // Clear the messages stack.
+ $this->getDrupalMessages();
+
+ // Ensures that no debug message is shown to user without the adequate
+ // permissions.
+ $query = \Drupal::entityQuery('user');
+ $query->addTag('debug');
+ $query->execute();
+
+ $messages = $this->getDrupalMessages();
+ $this->assertEmpty($messages);
+
+ // Ensures that the SQL debug message is shown to user with the adequate
+ // permissions. We expect only one status message containing the SQL for
+ // the debugged entity query.
+ \Drupal::currentUser()->setAccount($this->develUser);
+ $expected_message = "SELECT base_table.uid AS uid, base_table.uid AS base_table_uid\nFROM \n{users} base_table";
+
+ $query = \Drupal::entityQuery('user');
+ $query->addTag('debug');
+ $query->execute();
+
+ $messages = $this->getDrupalMessages();
+ $this->assertTrue(!empty($messages['status']));
+ $this->assertCount(1, $messages['status']);
+ $this->assertEquals(strip_tags($messages['status'][0]), $expected_message);
+ }
+
+ /**
+ * Retrieves the drupal messages.
+ *
+ * @return array
+ * The messages
+ */
+ protected function getDrupalMessages() {
+ return drupal_get_messages();
+ }
+
+}