class ExtensionPathResolverTest

class ExtensionPathResolverTest extends KernelTestBase {
  
  /**
   * @covers ::getPathname
   */
  public function testExtensionPathResolving() : void {
    // Retrieving the location of a module.
    $this->assertSame('core/modules/system/system.info.yml', \Drupal::service('extension.list.module')->getPathname('system'));
    // Retrieving the location of a theme.
    \Drupal::service('theme_installer')->install([
      'stark',
    ]);
    $this->assertSame('core/themes/stark/stark.info.yml', \Drupal::service('extension.list.theme')->getPathname('stark'));
    // Retrieving the location of a theme engine.
    $this->assertSame('core/themes/engines/twig/twig.info.yml', \Drupal::service('extension.list.theme_engine')->getPathname('twig'));
    // Retrieving the location of a profile. Profiles are a special case with
    // a fixed location and naming.
    $this->assertSame('core/profiles/testing/testing.info.yml', \Drupal::service('extension.list.profile')->getPathname('testing'));
  }
  
  /**
   * @covers ::getPath
   */
  public function testExtensionPathResolvingPath() : void {
    $this->assertSame('core/modules/system/tests/modules/driver_test', \Drupal::service('extension.list.module')->getPath('driver_test'));
  }
  
  /**
   * @covers ::getPathname
   */
  public function testExtensionPathResolvingWithNonExistingModule() : void {
    $this->expectException(UnknownExtensionException::class);
    $this->expectExceptionMessage('The module there_is_a_module_for_that does not exist.');
    $this->assertNull(\Drupal::service('extension.list.module')->getPathname('there_is_a_module_for_that'), 'Searching for an item that does not exist returns NULL.');
  }
  
  /**
   * @covers ::getPathname
   */
  public function testExtensionPathResolvingWithNonExistingTheme() : void {
    $this->expectException(UnknownExtensionException::class);
    $this->expectExceptionMessage('The theme there_is_a_theme_for_you does not exist.');
    $this->assertNull(\Drupal::service('extension.list.theme')->getPathname('there_is_a_theme_for_you'), 'Searching for an item that does not exist returns NULL.');
  }
  
  /**
   * @covers ::getPathname
   */
  public function testExtensionPathResolvingWithNonExistingProfile() : void {
    $this->expectException(UnknownExtensionException::class);
    $this->expectExceptionMessage('The profile there_is_an_install_profile_for_you does not exist.');
    $this->assertNull(\Drupal::service('extension.list.profile')->getPathname('there_is_an_install_profile_for_you'), 'Searching for an item that does not exist returns NULL.');
  }
  
  /**
   * @covers ::getPathname
   */
  public function testExtensionPathResolvingWithNonExistingThemeEngine() : void {
    $this->expectException(UnknownExtensionException::class);
    $this->expectExceptionMessage('The theme_engine there_is_an_theme_engine_for_you does not exist');
    $this->assertNull(\Drupal::service('extension.list.theme_engine')->getPathname('there_is_an_theme_engine_for_you'), 'Searching for an item that does not exist returns NULL.');
  }

}