TermTest.php

<?php

namespace Drupal\Tests\taxonomy\Functional;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Component\Utility\Tags;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\field\Entity\FieldConfig;
use Drupal\taxonomy\Entity\Term;

/**
 * Tests load, save and delete for taxonomy terms.
 *
 * @group taxonomy
 */
class TermTest extends TaxonomyTestBase {
    
    /**
     * Vocabulary for testing.
     *
     * @var \Drupal\taxonomy\VocabularyInterface
     */
    protected $vocabulary;
    
    /**
     * Taxonomy term reference field for testing.
     *
     * @var \Drupal\field\FieldConfigInterface
     */
    protected $field;
    
    /**
     * Modules to enable.
     *
     * @var string[]
     */
    public static $modules = [
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'classy';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->drupalPlaceBlock('local_actions_block');
        $this->drupalPlaceBlock('local_tasks_block');
        $this->drupalPlaceBlock('page_title_block');
        $this->drupalLogin($this->drupalCreateUser([
            'administer taxonomy',
            'bypass node access',
        ]));
        $this->vocabulary = $this->createVocabulary();
        $field_name = 'taxonomy_' . $this->vocabulary
            ->id();
        $handler_settings = [
            'target_bundles' => [
                $this->vocabulary
                    ->id() => $this->vocabulary
                    ->id(),
            ],
            'auto_create' => TRUE,
        ];
        $this->createEntityReferenceField('node', 'article', $field_name, NULL, 'taxonomy_term', 'default', $handler_settings, FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        $this->field = FieldConfig::loadByName('node', 'article', $field_name);
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $display_repository->getFormDisplay('node', 'article')
            ->setComponent($field_name, [
            'type' => 'options_select',
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'article')
            ->setComponent($field_name, [
            'type' => 'entity_reference_label',
        ])
            ->save();
    }
    
    /**
     * The "parent" field must restrict references to the same vocabulary.
     */
    public function testParentHandlerSettings() {
        $vocabulary_fields = \Drupal::service('entity_field.manager')->getFieldDefinitions('taxonomy_term', $this->vocabulary
            ->id());
        $parent_target_bundles = $vocabulary_fields['parent']->getSetting('handler_settings')['target_bundles'];
        $this->assertIdentical([
            $this->vocabulary
                ->id() => $this->vocabulary
                ->id(),
        ], $parent_target_bundles);
    }
    
    /**
     * Test terms in a single and multiple hierarchy.
     */
    public function testTaxonomyTermHierarchy() {
        // Create two taxonomy terms.
        $term1 = $this->createTerm($this->vocabulary);
        $term2 = $this->createTerm($this->vocabulary);
        // Get the taxonomy storage.
        
        /** @var \Drupal\taxonomy\TermStorageInterface $taxonomy_storage */
        $taxonomy_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('taxonomy_term');
        // Check that hierarchy is flat.
        $this->assertEquals(0, $taxonomy_storage->getVocabularyHierarchyType($this->vocabulary
            ->id()), 'Vocabulary is flat.');
        // Edit $term2, setting $term1 as parent.
        $edit = [];
        $edit['parent[]'] = [
            $term1->id(),
        ];
        $this->drupalPostForm('taxonomy/term/' . $term2->id() . '/edit', $edit, t('Save'));
        // Check the hierarchy.
        $children = $taxonomy_storage->loadChildren($term1->id());
        $parents = $taxonomy_storage->loadParents($term2->id());
        $this->assertTrue(isset($children[$term2->id()]), 'Child found correctly.');
        $this->assertTrue(isset($parents[$term1->id()]), 'Parent found correctly.');
        // Load and save a term, confirming that parents are still set.
        $term = Term::load($term2->id());
        $term->save();
        $parents = $taxonomy_storage->loadParents($term2->id());
        $this->assertTrue(isset($parents[$term1->id()]), 'Parent found correctly.');
        // Create a third term and save this as a parent of term2.
        $term3 = $this->createTerm($this->vocabulary);
        $term2->parent = [
            $term1->id(),
            $term3->id(),
        ];
        $term2->save();
        $parents = $taxonomy_storage->loadParents($term2->id());
        $this->assertTrue(isset($parents[$term1->id()]) && isset($parents[$term3->id()]), 'Both parents found successfully.');
    }
    
    /**
     * Tests that many terms with parents show on each page
     */
    public function testTaxonomyTermChildTerms() {
        // Set limit to 10 terms per page. Set variable to 9 so 10 terms appear.
        $this->config('taxonomy.settings')
            ->set('terms_per_page_admin', '9')
            ->save();
        $term1 = $this->createTerm($this->vocabulary);
        $terms_array = [];
        $taxonomy_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('taxonomy_term');
        // Create 40 terms. Terms 1-12 get parent of $term1. All others are
        // individual terms.
        for ($x = 1; $x <= 40; $x++) {
            $edit = [];
            // Set terms in order so we know which terms will be on which pages.
            $edit['weight'] = $x;
            // Set terms 1-20 to be children of first term created.
            if ($x <= 12) {
                $edit['parent'] = $term1->id();
            }
            $term = $this->createTerm($this->vocabulary, $edit);
            $children = $taxonomy_storage->loadChildren($term1->id());
            $parents = $taxonomy_storage->loadParents($term->id());
            $terms_array[$x] = Term::load($term->id());
        }
        // Get Page 1.
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview');
        $this->assertText($term1->getName(), 'Parent Term is displayed on Page 1');
        for ($x = 1; $x <= 13; $x++) {
            $this->assertText($terms_array[$x]->getName(), $terms_array[$x]->getName() . ' found on Page 1');
        }
        // Get Page 2.
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview', [
            'query' => [
                'page' => 1,
            ],
        ]);
        $this->assertText($term1->getName(), 'Parent Term is displayed on Page 2');
        for ($x = 1; $x <= 18; $x++) {
            $this->assertText($terms_array[$x]->getName(), $terms_array[$x]->getName() . ' found on Page 2');
        }
        // Get Page 3.
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview', [
            'query' => [
                'page' => 2,
            ],
        ]);
        $this->assertNoText($term1->getName(), 'Parent Term is not displayed on Page 3');
        for ($x = 1; $x <= 17; $x++) {
            $this->assertNoText($terms_array[$x]->getName(), $terms_array[$x]->getName() . ' not found on Page 3');
        }
        for ($x = 18; $x <= 25; $x++) {
            $this->assertText($terms_array[$x]->getName(), $terms_array[$x]->getName() . ' found on Page 3');
        }
    }
    
    /**
     * Test that hook_node_$op implementations work correctly.
     *
     * Save & edit a node and assert that taxonomy terms are saved/loaded properly.
     */
    public function testTaxonomyNode() {
        // Create two taxonomy terms.
        $term1 = $this->createTerm($this->vocabulary);
        $term2 = $this->createTerm($this->vocabulary);
        // Post an article.
        $edit = [];
        $edit['title[0][value]'] = $this->randomMachineName();
        $edit['body[0][value]'] = $this->randomMachineName();
        $edit[$this->field
            ->getName() . '[]'] = $term1->id();
        $this->drupalPostForm('node/add/article', $edit, t('Save'));
        // Check that the term is displayed when the node is viewed.
        $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
        $this->drupalGet('node/' . $node->id());
        $this->assertText($term1->getName(), 'Term is displayed when viewing the node.');
        $this->clickLink(t('Edit'));
        $this->assertText($term1->getName(), 'Term is displayed when editing the node.');
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertText($term1->getName(), 'Term is displayed after saving the node with no changes.');
        // Edit the node with a different term.
        $edit[$this->field
            ->getName() . '[]'] = $term2->id();
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
        $this->drupalGet('node/' . $node->id());
        $this->assertText($term2->getName(), 'Term is displayed when viewing the node.');
        // Preview the node.
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
        $this->assertUniqueText($term2->getName(), 'Term is displayed when previewing the node.');
        $this->drupalPostForm('node/' . $node->id() . '/edit', NULL, t('Preview'));
        $this->assertUniqueText($term2->getName(), 'Term is displayed when previewing the node again.');
    }
    
    /**
     * Test term creation with a free-tagging vocabulary from the node form.
     */
    public function testNodeTermCreationAndDeletion() {
        // Enable tags in the vocabulary.
        $field = $this->field;
        \Drupal::service('entity_display.repository')->getFormDisplay($field->getTargetEntityTypeId(), $field->getTargetBundle())
            ->setComponent($field->getName(), [
            'type' => 'entity_reference_autocomplete_tags',
            'settings' => [
                'placeholder' => 'Start typing here.',
            ],
        ])
            ->save();
        // Prefix the terms with a letter to ensure there is no clash in the first
        // three letters.
        // @see https://www.drupal.org/node/2397691
        $terms = [
            'term1' => 'a' . $this->randomMachineName(),
            'term2' => 'b' . $this->randomMachineName(),
            'term3' => 'c' . $this->randomMachineName() . ', ' . $this->randomMachineName(),
            'term4' => 'd' . $this->randomMachineName(),
        ];
        $edit = [];
        $edit['title[0][value]'] = $this->randomMachineName();
        $edit['body[0][value]'] = $this->randomMachineName();
        // Insert the terms in a comma separated list. Vocabulary 1 is a
        // free-tagging field created by the default profile.
        $edit[$field->getName() . '[target_id]'] = Tags::implode($terms);
        // Verify the placeholder is there.
        $this->drupalGet('node/add/article');
        $this->assertRaw('placeholder="Start typing here."', 'Placeholder is present.');
        // Preview and verify the terms appear but are not created.
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        foreach ($terms as $term) {
            $this->assertText($term, 'The term appears on the node preview.');
        }
        $tree = $this->container
            ->get('entity_type.manager')
            ->getStorage('taxonomy_term')
            ->loadTree($this->vocabulary
            ->id());
        $this->assertTrue(empty($tree), 'The terms are not created on preview.');
        // taxonomy.module does not maintain its static caches.
        taxonomy_terms_static_reset();
        // Save, creating the terms.
        $this->drupalPostForm('node/add/article', $edit, t('Save'));
        $this->assertText(t('@type @title has been created.', [
            '@type' => t('Article'),
            '@title' => $edit['title[0][value]'],
        ]), 'The node was created successfully.');
        // Verify that the creation message contains a link to a node.
        $view_link = $this->xpath('//div[@class="messages"]//a[contains(@href, :href)]', [
            ':href' => 'node/',
        ]);
        $this->assert(isset($view_link), 'The message area contains a link to a node');
        foreach ($terms as $term) {
            $this->assertText($term, 'The term was saved and appears on the node page.');
        }
        // Get the created terms.
        $term_objects = [];
        foreach ($terms as $key => $term) {
            $term_objects[$key] = taxonomy_term_load_multiple_by_name($term);
            $term_objects[$key] = reset($term_objects[$key]);
        }
        // Get the node.
        $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
        // Test editing the node.
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
        foreach ($terms as $term) {
            $this->assertText($term, 'The term was retained after edit and still appears on the node page.');
        }
        // Delete term 1 from the term edit page.
        $this->drupalGet('taxonomy/term/' . $term_objects['term1']->id() . '/edit');
        $this->clickLink(t('Delete'));
        $this->drupalPostForm(NULL, NULL, t('Delete'));
        // Delete term 2 from the term delete page.
        $this->drupalGet('taxonomy/term/' . $term_objects['term2']->id() . '/delete');
        $this->drupalPostForm(NULL, [], t('Delete'));
        $term_names = [
            $term_objects['term3']->getName(),
            $term_objects['term4']->getName(),
        ];
        $this->drupalGet('node/' . $node->id());
        foreach ($term_names as $term_name) {
            $this->assertText($term_name, new FormattableMarkup('The term %name appears on the node page after two terms, %deleted1 and %deleted2, were deleted.', [
                '%name' => $term_name,
                '%deleted1' => $term_objects['term1']->getName(),
                '%deleted2' => $term_objects['term2']->getName(),
            ]));
        }
        $this->assertNoText($term_objects['term1']->getName(), new FormattableMarkup('The deleted term %name does not appear on the node page.', [
            '%name' => $term_objects['term1']->getName(),
        ]));
        $this->assertNoText($term_objects['term2']->getName(), new FormattableMarkup('The deleted term %name does not appear on the node page.', [
            '%name' => $term_objects['term2']->getName(),
        ]));
    }
    
    /**
     * Save, edit and delete a term using the user interface.
     */
    public function testTermInterface() {
        \Drupal::service('module_installer')->install([
            'views',
        ]);
        $edit = [
            'name[0][value]' => $this->randomMachineName(12),
            'description[0][value]' => $this->randomMachineName(100),
        ];
        // Explicitly set the parents field to 'root', to ensure that
        // TermForm::save() handles the invalid term ID correctly.
        $edit['parent[]'] = [
            0,
        ];
        // Create the term to edit.
        $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/add', $edit, t('Save'));
        $terms = taxonomy_term_load_multiple_by_name($edit['name[0][value]']);
        $term = reset($terms);
        $this->assertNotNull($term, 'Term found in database.');
        // Submitting a term takes us to the add page; we need the List page.
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview');
        $this->clickLink(t('Edit'));
        $this->assertRaw($edit['name[0][value]'], 'The randomly generated term name is present.');
        $this->assertText($edit['description[0][value]'], 'The randomly generated term description is present.');
        $edit = [
            'name[0][value]' => $this->randomMachineName(14),
            'description[0][value]' => $this->randomMachineName(102),
        ];
        // Edit the term.
        $this->drupalPostForm('taxonomy/term/' . $term->id() . '/edit', $edit, t('Save'));
        // Check that the term is still present at admin UI after edit.
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview');
        $this->assertText($edit['name[0][value]'], 'The randomly generated term name is present.');
        $this->assertSession()
            ->linkExists(t('Edit'));
        // Check the term link can be clicked through to the term page.
        $this->clickLink($edit['name[0][value]']);
        $this->assertSession()
            ->statusCodeEquals(200);
        // View the term and check that it is correct.
        $this->drupalGet('taxonomy/term/' . $term->id());
        $this->assertText($edit['name[0][value]'], 'The randomly generated term name is present.');
        $this->assertText($edit['description[0][value]'], 'The randomly generated term description is present.');
        // Did this page request display a 'term-listing-heading'?
        $this->assertSession()
            ->elementExists('xpath', '//div[contains(@class, "field--name-description")]');
        // Check that it does NOT show a description when description is blank.
        $term->setDescription(NULL);
        $term->save();
        $this->drupalGet('taxonomy/term/' . $term->id());
        $this->assertSession()
            ->elementNotExists('xpath', '//div[contains(@class, "field--entity-taxonomy-term--description")]');
        // Check that the description value is processed.
        $value = $this->randomMachineName();
        $term->setDescription($value);
        $term->save();
        $this->assertEqual($term->description->processed, "<p>{$value}</p>\n");
        // Check that the term feed page is working.
        $this->drupalGet('taxonomy/term/' . $term->id() . '/feed');
        // Delete the term.
        $this->drupalGet('taxonomy/term/' . $term->id() . '/edit');
        $this->clickLink(t('Delete'));
        $this->drupalPostForm(NULL, NULL, t('Delete'));
        // Assert that the term no longer exists.
        $this->drupalGet('taxonomy/term/' . $term->id());
        $this->assertSession()
            ->statusCodeEquals(404);
    }
    
    /**
     * Save, edit and delete a term using the user interface.
     */
    public function testTermReorder() {
        $assert = $this->assertSession();
        $this->createTerm($this->vocabulary);
        $this->createTerm($this->vocabulary);
        $this->createTerm($this->vocabulary);
        $taxonomy_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('taxonomy_term');
        // Fetch the created terms in the default alphabetical order, i.e. term1
        // precedes term2 alphabetically, and term2 precedes term3.
        $taxonomy_storage->resetCache();
        list($term1, $term2, $term3) = $taxonomy_storage->loadTree($this->vocabulary
            ->id(), 0, NULL, TRUE);
        $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview');
        // Each term has four hidden fields, "tid:1:0[tid]", "tid:1:0[parent]",
        // "tid:1:0[depth]", and "tid:1:0[weight]". Change the order to term2,
        // term3, term1 by setting weight property, make term3 a child of term2 by
        // setting the parent and depth properties, and update all hidden fields.
        $hidden_edit = [
            'terms[tid:' . $term2->id() . ':0][term][tid]' => $term2->id(),
            'terms[tid:' . $term2->id() . ':0][term][parent]' => 0,
            'terms[tid:' . $term2->id() . ':0][term][depth]' => 0,
            'terms[tid:' . $term3->id() . ':0][term][tid]' => $term3->id(),
            'terms[tid:' . $term3->id() . ':0][term][parent]' => $term2->id(),
            'terms[tid:' . $term3->id() . ':0][term][depth]' => 1,
            'terms[tid:' . $term1->id() . ':0][term][tid]' => $term1->id(),
            'terms[tid:' . $term1->id() . ':0][term][parent]' => 0,
            'terms[tid:' . $term1->id() . ':0][term][depth]' => 0,
        ];
        // Because we can't post hidden form elements, we have to change them in
        // code here, and then submit.
        foreach ($hidden_edit as $field => $value) {
            $node = $assert->hiddenFieldExists($field);
            $node->setValue($value);
        }
        // Edit non-hidden elements within drupalPostForm().
        $edit = [
            'terms[tid:' . $term2->id() . ':0][weight]' => 0,
            'terms[tid:' . $term3->id() . ':0][weight]' => 1,
            'terms[tid:' . $term1->id() . ':0][weight]' => 2,
        ];
        $this->drupalPostForm(NULL, $edit, 'Save');
        $taxonomy_storage->resetCache();
        $terms = $taxonomy_storage->loadTree($this->vocabulary
            ->id());
        $this->assertEqual($terms[0]->tid, $term2->id(), 'Term 2 was moved above term 1.');
        $this->assertEqual($terms[1]->parents, [
            $term2->id(),
        ], 'Term 3 was made a child of term 2.');
        $this->assertEqual($terms[2]->tid, $term1->id(), 'Term 1 was moved below term 2.');
        $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview', [], t('Reset to alphabetical'));
        // Submit confirmation form.
        $this->drupalPostForm(NULL, [], t('Reset to alphabetical'));
        // Ensure form redirected back to overview.
        $this->assertUrl('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/overview');
        $taxonomy_storage->resetCache();
        $terms = $taxonomy_storage->loadTree($this->vocabulary
            ->id(), 0, NULL, TRUE);
        $this->assertEqual($terms[0]->id(), $term1->id(), 'Term 1 was moved to back above term 2.');
        $this->assertEqual($terms[1]->id(), $term2->id(), 'Term 2 was moved to back below term 1.');
        $this->assertEqual($terms[2]->id(), $term3->id(), 'Term 3 is still below term 2.');
        $this->assertEqual($terms[2]->parents, [
            $term2->id(),
        ], 'Term 3 is still a child of term 2.');
    }
    
    /**
     * Test saving a term with multiple parents through the UI.
     */
    public function testTermMultipleParentsInterface() {
        // Add a new term to the vocabulary so that we can have multiple parents.
        $parent = $this->createTerm($this->vocabulary);
        // Add a new term with multiple parents.
        $edit = [
            'name[0][value]' => $this->randomMachineName(12),
            'description[0][value]' => $this->randomMachineName(100),
            'parent[]' => [
                0,
                $parent->id(),
            ],
        ];
        // Save the new term.
        $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/add', $edit, t('Save'));
        // Check that the term was successfully created.
        $terms = taxonomy_term_load_multiple_by_name($edit['name[0][value]']);
        $term = reset($terms);
        $this->assertNotNull($term, 'Term found in database.');
        $this->assertEqual($edit['name[0][value]'], $term->getName(), 'Term name was successfully saved.');
        $this->assertEqual($edit['description[0][value]'], $term->getDescription(), 'Term description was successfully saved.');
        // Check that the parent tid is still there. The other parent (<root>) is
        // not added by \Drupal\taxonomy\TermStorageInterface::loadParents().
        $parents = $this->container
            ->get('entity_type.manager')
            ->getStorage('taxonomy_term')
            ->loadParents($term->id());
        $parent = reset($parents);
        $this->assertEqual($edit['parent[]'][1], $parent->id(), 'Term parents were successfully saved.');
    }
    
    /**
     * Test taxonomy_term_load_multiple_by_name().
     */
    public function testTaxonomyGetTermByName() {
        $term = $this->createTerm($this->vocabulary);
        // Load the term with the exact name.
        $terms = taxonomy_term_load_multiple_by_name($term->getName());
        $this->assertTrue(isset($terms[$term->id()]), 'Term loaded using exact name.');
        // Load the term with space concatenated.
        $terms = taxonomy_term_load_multiple_by_name('  ' . $term->getName() . '   ');
        $this->assertTrue(isset($terms[$term->id()]), 'Term loaded with extra whitespace.');
        // Load the term with name uppercased.
        $terms = taxonomy_term_load_multiple_by_name(strtoupper($term->getName()));
        $this->assertTrue(isset($terms[$term->id()]), 'Term loaded with uppercased name.');
        // Load the term with name lowercased.
        $terms = taxonomy_term_load_multiple_by_name(strtolower($term->getName()));
        $this->assertTrue(isset($terms[$term->id()]), 'Term loaded with lowercased name.');
        // Try to load an invalid term name.
        $terms = taxonomy_term_load_multiple_by_name('Banana');
        $this->assertEmpty($terms, 'No term loaded with an invalid name.');
        // Try to load the term using a substring of the name.
        $terms = taxonomy_term_load_multiple_by_name(mb_substr($term->getName(), 2), 'No term loaded with a substring of the name.');
        $this->assertEmpty($terms);
        // Create a new term in a different vocabulary with the same name.
        $new_vocabulary = $this->createVocabulary();
        $new_term = Term::create([
            'name' => $term->getName(),
            'vid' => $new_vocabulary->id(),
        ]);
        $new_term->save();
        // Load multiple terms with the same name.
        $terms = taxonomy_term_load_multiple_by_name($term->getName());
        $this->assertCount(2, $terms, 'Two terms loaded with the same name.');
        // Load single term when restricted to one vocabulary.
        $terms = taxonomy_term_load_multiple_by_name($term->getName(), $this->vocabulary
            ->id());
        $this->assertCount(1, $terms, 'One term loaded when restricted by vocabulary.');
        $this->assertTrue(isset($terms[$term->id()]), 'Term loaded using exact name and vocabulary machine name.');
        // Create a new term with another name.
        $term2 = $this->createTerm($this->vocabulary);
        // Try to load a term by name that doesn't exist in this vocabulary but
        // exists in another vocabulary.
        $terms = taxonomy_term_load_multiple_by_name($term2->getName(), $new_vocabulary->id());
        $this->assertEmpty($terms, 'Invalid term name restricted by vocabulary machine name not loaded.');
        // Try to load terms filtering by a non-existing vocabulary.
        $terms = taxonomy_term_load_multiple_by_name($term2->getName(), 'non_existing_vocabulary');
        $this->assertCount(0, $terms, 'No terms loaded when restricted by a non-existing vocabulary.');
    }
    
    /**
     * Tests that editing and saving a node with no changes works correctly.
     */
    public function testReSavingTags() {
        // Enable tags in the vocabulary.
        $field = $this->field;
        \Drupal::service('entity_display.repository')->getFormDisplay($field->getTargetEntityTypeId(), $field->getTargetBundle())
            ->setComponent($field->getName(), [
            'type' => 'entity_reference_autocomplete_tags',
        ])
            ->save();
        // Create a term and a node using it.
        $term = $this->createTerm($this->vocabulary);
        $edit = [];
        $edit['title[0][value]'] = $this->randomMachineName(8);
        $edit['body[0][value]'] = $this->randomMachineName(16);
        $edit[$this->field
            ->getName() . '[target_id]'] = $term->getName();
        $this->drupalPostForm('node/add/article', $edit, t('Save'));
        // Check that the term is displayed when editing and saving the node with no
        // changes.
        $this->clickLink(t('Edit'));
        $this->assertRaw($term->getName(), 'Term is displayed when editing the node.');
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertRaw($term->getName(), 'Term is displayed after saving the node with no changes.');
    }
    
    /**
     * Check the breadcrumb on edit and delete a term page.
     */
    public function testTermBreadcrumbs() {
        $edit = [
            'name[0][value]' => $this->randomMachineName(14),
            'description[0][value]' => $this->randomMachineName(100),
            'parent[]' => [
                0,
            ],
        ];
        // Create the term.
        $this->drupalPostForm('admin/structure/taxonomy/manage/' . $this->vocabulary
            ->id() . '/add', $edit, 'Save');
        $terms = taxonomy_term_load_multiple_by_name($edit['name[0][value]']);
        $term = reset($terms);
        $this->assertNotNull($term, 'Term found in database.');
        // Check the breadcrumb on the term edit page.
        $this->drupalGet('taxonomy/term/' . $term->id() . '/edit');
        $breadcrumbs = $this->getSession()
            ->getPage()
            ->findAll('css', 'nav.breadcrumb ol li a');
        $this->assertCount(2, $breadcrumbs, 'The breadcrumbs are present on the page.');
        $this->assertIdentical($breadcrumbs[0]->getText(), 'Home', 'First breadcrumb text is Home');
        $this->assertIdentical($breadcrumbs[1]->getText(), $term->label(), 'Second breadcrumb text is term name on term edit page.');
        $this->assertEscaped($breadcrumbs[1]->getText());
        // Check the breadcrumb on the term delete page.
        $this->drupalGet('taxonomy/term/' . $term->id() . '/delete');
        $breadcrumbs = $this->getSession()
            ->getPage()
            ->findAll('css', 'nav.breadcrumb ol li a');
        $this->assertCount(2, $breadcrumbs, 'The breadcrumbs are present on the page.');
        $this->assertIdentical($breadcrumbs[0]->getText(), 'Home', 'First breadcrumb text is Home');
        $this->assertIdentical($breadcrumbs[1]->getText(), $term->label(), 'Second breadcrumb text is term name on term delete page.');
        $this->assertEscaped($breadcrumbs[1]->getText());
    }

}