class TaxonomyTermIndentationTest

class TaxonomyTermIndentationTest extends TaxonomyTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'taxonomy',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Vocabulary for testing.
   *
   * @var \Drupal\taxonomy\VocabularyInterface
   */
  protected $vocabulary;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalLogin($this->drupalCreateUser([
      'administer taxonomy',
      'bypass node access',
    ]));
    $this->vocabulary = $this->createVocabulary();
  }
  
  /**
   * Tests term indentation.
   */
  public function testTermIndentation() {
    $assert = $this->assertSession();
    // 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_type.manager')
      ->getStorage('taxonomy_term');
    // Indent the second term under the first one.
    $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
      ->get('vid') . '/overview');
    $hidden_edit = [
      'terms[tid:' . $term2->id() . ':0][term][tid]' => 2,
      'terms[tid:' . $term2->id() . ':0][term][parent]' => 1,
      'terms[tid:' . $term2->id() . ':0][term][depth]' => 1,
    ];
    // Because we can't post hidden form elements, we have to change them in
    // code here, and then submit.
    foreach ($hidden_edit as $field => $value) {
      $node = $assert->hiddenFieldExists($field);
      $node->setValue($value);
    }
    $edit = [
      'terms[tid:' . $term2->id() . ':0][weight]' => 1,
    ];
    // Submit the edited form and check for HTML indentation element presence.
    $this->submitForm($edit, 'Save');
    $this->assertSession()
      ->responseMatches('|<div class="js-indentation indentation">&nbsp;</div>|');
    // Check explicitly that term 2's parent is term 1.
    $parents = $taxonomy_storage->loadParents($term2->id());
    $this->assertEquals(1, key($parents), 'Term 1 is the term 2\'s parent');
    // Move the second term back out to the root level.
    $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
      ->get('vid') . '/overview');
    $hidden_edit = [
      'terms[tid:' . $term2->id() . ':0][term][tid]' => 2,
      'terms[tid:' . $term2->id() . ':0][term][parent]' => 0,
      'terms[tid:' . $term2->id() . ':0][term][depth]' => 0,
    ];
    // Because we can't post hidden form elements, we have to change them in
    // code here, and then submit.
    foreach ($hidden_edit as $field => $value) {
      $node = $assert->hiddenFieldExists($field);
      $node->setValue($value);
    }
    $edit = [
      'terms[tid:' . $term2->id() . ':0][weight]' => 1,
    ];
    $this->submitForm($edit, 'Save');
    // All terms back at the root level, no indentation should be present.
    $this->assertSession()
      ->responseNotMatches('|<div class="js-indentation indentation">&nbsp;</div>|');
    // Check explicitly that term 2 has no parents.
    \Drupal::entityTypeManager()->getStorage('taxonomy_term')
      ->resetCache();
    $parents = $taxonomy_storage->loadParents($term2->id());
    $this->assertEmpty($parents, 'Term 2 has no parents now');
  }

}