--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Module;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\Tests\taxonomy\Functional\TaxonomyTestTrait;
+
+/**
+ * Tests that modules which provide entity types can be uninstalled.
+ *
+ * @group Module
+ */
+class PrepareUninstallTest extends BrowserTestBase {
+
+ use TaxonomyTestTrait;
+
+ /**
+ * An array of node objects.
+ *
+ * @var \Drupal\node\NodeInterface[]
+ */
+ protected $nodes;
+
+ /**
+ * An array of taxonomy term objects.
+ *
+ * @var \Drupal\taxonomy\TermInterface[]
+ */
+ protected $terms;
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['node', 'taxonomy', 'entity_test'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setUp() {
+ parent::setUp();
+
+ $admin_user = $this->drupalCreateUser(['administer modules']);
+ $this->drupalLogin($admin_user);
+
+ // Create 10 nodes.
+ for ($i = 1; $i <= 5; $i++) {
+ $this->nodes[] = $this->drupalCreateNode(['type' => 'page']);
+ $this->nodes[] = $this->drupalCreateNode(['type' => 'article']);
+ }
+
+ // Create 3 top-level taxonomy terms, each with 11 children.
+ $vocabulary = $this->createVocabulary();
+ for ($i = 1; $i <= 3; $i++) {
+ $term = $this->createTerm($vocabulary);
+ $this->terms[] = $term;
+ for ($j = 1; $j <= 11; $j++) {
+ $this->terms[] = $this->createTerm($vocabulary, ['parent' => ['target_id' => $term->id()]]);
+ }
+ }
+ }
+
+ /**
+ * Tests that Node and Taxonomy can be uninstalled.
+ */
+ public function testUninstall() {
+ // Check that Taxonomy cannot be uninstalled yet.
+ $this->drupalGet('admin/modules/uninstall');
+ $this->assertText('Remove content items');
+ $this->assertLinkByHref('admin/modules/uninstall/entity/taxonomy_term');
+
+ // Delete Taxonomy term data.
+ $this->drupalGet('admin/modules/uninstall/entity/taxonomy_term');
+ $term_count = count($this->terms);
+ for ($i = 1; $i < 11; $i++) {
+ $this->assertText($this->terms[$term_count - $i]->label());
+ }
+ $term_count = $term_count - 10;
+ $this->assertText("And $term_count more taxonomy term entities.");
+ $this->assertText('This action cannot be undone.');
+ $this->assertText('Make a backup of your database if you want to be able to restore these items.');
+ $this->drupalPostForm(NULL, [], t('Delete all taxonomy term entities'));
+
+ // Check that we are redirected to the uninstall page and data has been
+ // removed.
+ $this->assertUrl('admin/modules/uninstall', []);
+ $this->assertText('All taxonomy term entities have been deleted.');
+
+ // Check that there is no more data to be deleted, Taxonomy is ready to be
+ // uninstalled.
+ $this->assertText('Enables the categorization of content.');
+ $this->assertNoLinkByHref('admin/modules/uninstall/entity/taxonomy_term');
+
+ // Uninstall the Taxonomy module.
+ $this->drupalPostForm('admin/modules/uninstall', ['uninstall[taxonomy]' => TRUE], t('Uninstall'));
+ $this->drupalPostForm(NULL, [], t('Uninstall'));
+ $this->assertText('The selected modules have been uninstalled.');
+ $this->assertNoText('Enables the categorization of content.');
+
+ // Check Node cannot be uninstalled yet, there is content to be removed.
+ $this->drupalGet('admin/modules/uninstall');
+ $this->assertText('Remove content items');
+ $this->assertLinkByHref('admin/modules/uninstall/entity/node');
+
+ // Delete Node data.
+ $this->drupalGet('admin/modules/uninstall/entity/node');
+ // All 10 nodes should be listed.
+ foreach ($this->nodes as $node) {
+ $this->assertText($node->label());
+ }
+
+ // Ensures there is no more count when not necessary.
+ $this->assertNoText('And 0 more content');
+ $this->assertText('This action cannot be undone.');
+ $this->assertText('Make a backup of your database if you want to be able to restore these items.');
+
+ // Create another node so we have 11.
+ $this->nodes[] = $this->drupalCreateNode(['type' => 'page']);
+ $this->drupalGet('admin/modules/uninstall/entity/node');
+ // Ensures singular case is used when a single entity is left after listing
+ // the first 10's labels.
+ $this->assertText('And 1 more content item.');
+
+ // Create another node so we have 12.
+ $this->nodes[] = $this->drupalCreateNode(['type' => 'article']);
+ $this->drupalGet('admin/modules/uninstall/entity/node');
+ // Ensures singular case is used when a single entity is left after listing
+ // the first 10's labels.
+ $this->assertText('And 2 more content items.');
+
+ $this->drupalPostForm(NULL, [], t('Delete all content items'));
+
+ // Check we are redirected to the uninstall page and data has been removed.
+ $this->assertUrl('admin/modules/uninstall', []);
+ $this->assertText('All content items have been deleted.');
+
+ // Check there is no more data to be deleted, Node is ready to be
+ // uninstalled.
+ $this->assertText('Allows content to be submitted to the site and displayed on pages.');
+ $this->assertNoLinkByHref('admin/modules/uninstall/entity/node');
+
+ // Uninstall Node module.
+ $this->drupalPostForm('admin/modules/uninstall', ['uninstall[node]' => TRUE], t('Uninstall'));
+ $this->drupalPostForm(NULL, [], t('Uninstall'));
+ $this->assertText('The selected modules have been uninstalled.');
+ $this->assertNoText('Allows content to be submitted to the site and displayed on pages.');
+
+ // Ensure the proper response when accessing a non-existent entity type.
+ $this->drupalGet('admin/modules/uninstall/entity/node');
+ $this->assertResponse(404, 'Entity types that do not exist result in a 404.');
+
+ // Test an entity type which does not have any existing entities.
+ $this->drupalGet('admin/modules/uninstall/entity/entity_test_no_label');
+ $this->assertText('There are 0 entity test without label entities to delete.');
+ $button_xpath = '//input[@type="submit"][@value="Delete all entity test without label entities"]';
+ $this->assertNoFieldByXPath($button_xpath, NULL, 'Button with value "Delete all entity test without label entities" not found');
+
+ // Test an entity type without a label.
+ /** @var \Drupal\Core\Entity\EntityStorageInterface $storage */
+ $storage = $this->container->get('entity.manager')
+ ->getStorage('entity_test_no_label');
+ $storage->create([
+ 'id' => Unicode::strtolower($this->randomMachineName()),
+ 'name' => $this->randomMachineName(),
+ ])->save();
+ $this->drupalGet('admin/modules/uninstall/entity/entity_test_no_label');
+ $this->assertText('This will delete 1 entity test without label.');
+ $this->assertFieldByXPath($button_xpath, NULL, 'Button with value "Delete all entity test without label entities" found');
+ $storage->create([
+ 'id' => Unicode::strtolower($this->randomMachineName()),
+ 'name' => $this->randomMachineName(),
+ ])->save();
+ $this->drupalGet('admin/modules/uninstall/entity/entity_test_no_label');
+ $this->assertText('This will delete 2 entity test without label entities.');
+ }
+
+}