class EntityDisplayTest

class EntityDisplayTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'field_ui',
    'entity_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalLogin($this->drupalCreateUser([
      'administer entity_test display',
    ]));
  }
  
  /**
   * Tests the use of regions for entity view displays.
   */
  public function testEntityView() {
    $this->drupalGet('entity_test/structure/entity_test/display');
    $this->assertSession()
      ->elementExists('css', '.region-content-message.region-empty');
    $this->assertTrue($this->assertSession()
      ->optionExists('fields[field_test_text][region]', 'hidden')
      ->isSelected());
    $this->getSession()
      ->getPage()
      ->selectFieldOption('fields[field_test_text][region]', 'content');
    $this->assertTrue($this->assertSession()
      ->optionExists('fields[field_test_text][region]', 'content')
      ->isSelected());
    $this->submitForm([], 'Save');
    $this->assertSession()
      ->pageTextContains('Your settings have been saved.');
    $this->assertTrue($this->assertSession()
      ->optionExists('fields[field_test_text][region]', 'content')
      ->isSelected());
  }

}