--- /dev/null
+<?php
+
+namespace Drupal\taxonomy\Tests;
+
+/**
+ * Ensure that the term indentation works properly.
+ *
+ * @group taxonomy
+ */
+class TaxonomyTermIndentationTest extends TaxonomyTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['taxonomy'];
+
+ /**
+ * Vocabulary for testing.
+ *
+ * @var \Drupal\taxonomy\VocabularyInterface
+ */
+ protected $vocabulary;
+
+ protected function setUp() {
+ parent::setUp();
+ $this->drupalLogin($this->drupalCreateUser(['administer taxonomy', 'bypass node access']));
+ $this->vocabulary = $this->createVocabulary();
+ }
+
+ /**
+ * Tests term indentation.
+ */
+ public function testTermIndentation() {
+ // Create three taxonomy terms.
+ $term1 = $this->createTerm($this->vocabulary);
+ $term2 = $this->createTerm($this->vocabulary);
+ $term3 = $this->createTerm($this->vocabulary);
+
+ // Get the taxonomy storage.
+ $taxonomy_storage = $this->container->get('entity.manager')->getStorage('taxonomy_term');
+
+ // Indent the second term under the first one.
+ $edit = [
+ 'terms[tid:' . $term2->id() . ':0][term][tid]' => 2,
+ 'terms[tid:' . $term2->id() . ':0][term][parent]' => 1,
+ 'terms[tid:' . $term2->id() . ':0][term][depth]' => 1,
+ 'terms[tid:' . $term2->id() . ':0][weight]' => 1,
+ ];
+
+ // Submit the edited form and check for HTML indentation element presence.
+ $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary->get('vid') . '/overview', $edit, t('Save'));
+ $this->assertPattern('|<div class="js-indentation indentation"> </div>|');
+
+ // Check explicitly that term 2's parent is term 1.
+ $parents = $taxonomy_storage->loadParents($term2->id());
+ $this->assertEqual(key($parents), 1, 'Term 1 is the term 2\'s parent');
+
+ // Move the second term back out to the root level.
+ $edit = [
+ 'terms[tid:' . $term2->id() . ':0][term][tid]' => 2,
+ 'terms[tid:' . $term2->id() . ':0][term][parent]' => 0,
+ 'terms[tid:' . $term2->id() . ':0][term][depth]' => 0,
+ 'terms[tid:' . $term2->id() . ':0][weight]' => 1,
+ ];
+
+ $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary->get('vid' ) . '/overview', $edit, t('Save'));
+ // All terms back at the root level, no indentation should be present.
+ $this->assertNoPattern('|<div class="js-indentation indentation"> </div>|');
+
+ // Check explicitly that term 2 has no parents.
+ \Drupal::entityManager()->getStorage('taxonomy_term')->resetCache();
+ $parents = $taxonomy_storage->loadParents($term2->id());
+ $this->assertTrue(empty($parents), 'Term 2 has no parents now');
+ }
+
+}