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diff --git a/web/core/modules/system/tests/src/Functional/Module/PrepareUninstallTest.php b/web/core/modules/system/tests/src/Functional/Module/PrepareUninstallTest.php
new file mode 100644
index 000000000..86d06e35e
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Module/PrepareUninstallTest.php
@@ -0,0 +1,179 @@
+<?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.');
+  }
+
+}