addTestImageStyleMappings example

'id' => 'style_one',
      'label' => 'Style One',
      'breakpoint_group' => 'responsive_image_test_module',
      'fallback_image_style' => 'large',
    ]);
  }

  /** * Tests responsive image formatters on node display for public files. */
  public function testResponsiveImageFieldFormattersPublic() {
    $this->addTestImageStyleMappings();
    $this->doTestResponsiveImageFieldFormatters('public');
  }

  /** * Tests responsive image formatters on node display for private files. */
  public function testResponsiveImageFieldFormattersPrivate() {
    $this->addTestImageStyleMappings();
    // Remove access content permission from anonymous users.     user_role_change_permissions(RoleInterface::ANONYMOUS_ID, ['access content' => FALSE]);
    $this->doTestResponsiveImageFieldFormatters('private');
  }