class TaxonomyGlossaryTest

class TaxonomyGlossaryTest extends ViewTestBase {
    use TaxonomyTestTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'taxonomy',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Views used by this test.
     *
     * @var array
     */
    public static $testViews = [
        'test_taxonomy_glossary',
    ];
    
    /**
     * Taxonomy terms used by this test.
     *
     * @var \Drupal\taxonomy\Entity\Term[]
     */
    protected $taxonomyTerms;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp($import_test_views = TRUE, $modules = [
        'views_test_config',
    ]) : void {
        parent::setUp($import_test_views, $modules);
        $this->enableViewsTestModule();
        
        /** @var \Drupal\taxonomy\Entity\Vocabulary $vocabulary */
        $vocabulary = $this->createVocabulary();
        for ($i = 0; $i < 10; $i++) {
            $this->taxonomyTerms[] = $this->createTerm($vocabulary);
        }
        $this->taxonomyTerms[] = $this->createTerm($vocabulary, [
            'name' => '0' . $this->randomMachineName(),
        ]);
    }
    
    /**
     * Tests a taxonomy glossary view.
     */
    public function testTaxonomyGlossaryView() : void {
        $initials = [];
        foreach ($this->taxonomyTerms as $term) {
            $char = mb_strtolower(substr($term->label(), 0, 1));
            $initials += [
                $char => 0,
            ];
            $initials[$char]++;
        }
        $this->drupalGet('test_taxonomy_glossary');
        $assert_session = $this->assertSession();
        foreach ($initials as $char => $count) {
            $href = Url::fromUserInput('/test_taxonomy_glossary/' . $char)->toString();
            $xpath = $assert_session->buildXPathQuery('//a[@href=:href and normalize-space(text())=:label]', [
                ':href' => $href,
                ':label' => $char,
            ]);
            $link = $assert_session->elementExists('xpath', $xpath);
            // Assert that the expected number of results is indicated in the link.
            preg_match("/{$char} \\(([0-9]+)\\)/", $link->getParent()
                ->getText(), $matches);
            $this->assertEquals($count, $matches[1]);
        }
        // Check that no other glossary links but the expected ones have been
        // rendered.
        $assert_session->elementsCount('xpath', '/ancestor::ul//a', count($initials), $link);
        // Go the taxonomy glossary page for the first term.
        $this->drupalGet('test_taxonomy_glossary/' . substr($this->taxonomyTerms[0]
            ->getName(), 0, 1));
        $assert_session->pageTextContains($this->taxonomyTerms[0]
            ->getName());
    }

}