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');
    }

}