Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/comment/src/Tests/CommentUninstallTest.php

@@ -0,0 +1,88 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\comment\Tests\CommentUninstallTest.
+ */
+
+namespace Drupal\comment\Tests;
+
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\Core\Extension\ModuleUninstallValidatorException;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests comment module uninstallation.
+ *
+ * @group comment
+ */
+class CommentUninstallTest extends WebTestBase {
+
+  use CommentTestTrait;
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = array('comment', 'node');
+
+  protected function setUp() {
+    parent::setup();
+
+    // Create an article content type.
+    $this->drupalCreateContentType(array('type' => 'article', 'name' => t('Article')));
+    // Create comment field on article so that adds 'comment_body' field.
+    $this->addDefaultCommentField('node', 'article');
+  }
+
+  /**
+   * Tests if comment module uninstallation fails if the field exists.
+   *
+   * @throws \Drupal\Core\Extension\ModuleUninstallValidatorException
+   */
+  function testCommentUninstallWithField() {
+    // Ensure that the field exists before uninstallation.
+    $field_storage = FieldStorageConfig::loadByName('comment', 'comment_body');
+    $this->assertNotNull($field_storage, 'The comment_body field exists.');
+
+    // Uninstall the comment module which should trigger an exception.
+    try {
+      $this->container->get('module_installer')->uninstall(array('comment'));
+      $this->fail("Expected an exception when uninstall was attempted.");
+    }
+    catch (ModuleUninstallValidatorException $e) {
+      $this->pass("Caught an exception when uninstall was attempted.");
+    }
+  }
+
+
+  /**
+   * Tests if uninstallation succeeds if the field has been deleted beforehand.
+   */
+  function testCommentUninstallWithoutField() {
+    // Manually delete the comment_body field before module uninstallation.
+    $field_storage = FieldStorageConfig::loadByName('comment', 'comment_body');
+    $this->assertNotNull($field_storage, 'The comment_body field exists.');
+    $field_storage->delete();
+
+    // Check that the field is now deleted.
+    $field_storage = FieldStorageConfig::loadByName('comment', 'comment_body');
+    $this->assertNull($field_storage, 'The comment_body field has been deleted.');
+
+    // Manually delete the comment field on the node before module uninstallation.
+    $field_storage = FieldStorageConfig::loadByName('node', 'comment');
+    $this->assertNotNull($field_storage, 'The comment field exists.');
+    $field_storage->delete();
+
+    // Check that the field is now deleted.
+    $field_storage = FieldStorageConfig::loadByName('node', 'comment');
+    $this->assertNull($field_storage, 'The comment field has been deleted.');
+
+    field_purge_batch(10);
+    // Ensure that uninstallation succeeds even if the field has already been
+    // deleted manually beforehand.
+    $this->container->get('module_installer')->uninstall(array('comment'));
+  }
+
+}