class EntityAutocompleteTest

class EntityAutocompleteTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    public static $modules = [
        'ajax_example',
    ];
    
    /**
     * Test the behavior of the submit-driven AJAX example.
     *
     * Behaviors to test:
     * - GET the route ajax_example.autocomplete_user.
     * - Examine the DOM to make sure our change hasn't happened yet.
     * - Send an event to the DOM to trigger the autocomplete.
     * - Wait for the autocomplete request to complete.
     * - Examine the DOM to see if our expected change happened.
     * - Submit some names to see if our form processed the user properly.
     */
    public function testSubmitDriven() {
        // Set up some accounts with known names.
        $names = [
            'bb',
            'bc',
        ];
        foreach ($names as $name) {
            $this->createUser([], $name);
        }
        // Get our various Mink elements.
        $assert = $this->assertSession();
        $session = $this->getSession();
        $page = $session->getPage();
        // We'll be using the users field quite a bit, so let's make it a variable.
        $users_field_id = 'edit-users';
        // Get the form.
        $this->drupalGet(Url::fromRoute('ajax_example.autocomplete_user'));
        // Examine the DOM to make sure our change hasn't happened yet.
        $assert->fieldValueEquals($users_field_id, '');
        // Send an event to the DOM. This will start the autocomplete process.
        $autocomplete_field = $page->findById($users_field_id);
        // We can cause the autocomplete to happen by setting the value in the
        // element.
        $autocomplete_field->setValue('b');
        $this->getSession()
            ->getDriver()
            ->keyDown($autocomplete_field->getXpath(), ' ');
        // Wait for the autocomplete request to complete. Our code is much quicker
        // than the request time.
        $assert->waitOnAutocomplete();
        // Examine the DOM to see if our expected change happened.
        $results = $page->findAll('css', '.ui-autocomplete li');
        $this->assertCount(2, $results);
        foreach ($results as $result) {
            $this->assertContains($result->getText(), $names);
        }
        // Submit to see if our form processed the user properly.
        $autocomplete_field->blur();
        $this->submitForm([
            $users_field_id => 'bb, bc',
        ], 'Submit');
        $assert->pageTextContains('These are your users: bb bc');
    }

}