ThemeHandlerLegacyTest.php

<?php

namespace Drupal\KernelTests\Core\Theme;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests deprecated methods of ThemeHandler.
 *
 * @coversDefaultClass \Drupal\Core\Extension\ThemeHandler
 * @group legacy
 */
class ThemeHandlerLegacyTest extends KernelTestBase {
    
    /**
     * The theme handler.
     *
     * @var \Drupal\Core\Extension\ThemeHandlerInterface
     */
    protected $themeHandler;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->themeHandler = \Drupal::service('theme_handler');
    }
    
    /**
     * @covers ::install
     * @covers ::uninstall
     * @expectedDeprecation \Drupal\Core\Extension\ThemeHandlerInterface::install() is deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use \Drupal\Core\Extension\ThemeInstallerInterface::install() instead. See https://www.drupal.org/node/3017233
     * @expectedDeprecation \Drupal\Core\Extension\ThemeHandlerInterface::uninstall() is deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use \Drupal\Core\Extension\ThemeInstallerInterface::uninstall() instead. See https://www.drupal.org/node/3017233
     */
    public function testInstallUninstall() {
        $theme = 'seven';
        $this->assertFalse($this->themeHandler
            ->themeExists($theme));
        $this->assertEquals(TRUE, $this->themeHandler
            ->install([
            $theme,
        ]));
        $this->assertTrue($this->themeHandler
            ->themeExists($theme));
        $this->themeHandler
            ->uninstall([
            $theme,
        ]);
        $this->assertFalse($this->themeHandler
            ->themeExists($theme));
    }

}