NewDefaultThemeBlocksTest.php

<?php

namespace Drupal\Tests\block\Kernel;

use Drupal\KernelTests\KernelTestBase;
use Drupal\Tests\block\Traits\BlockCreationTrait;

/**
 * Tests that the new default theme gets blocks.
 *
 * @group block
 */
class NewDefaultThemeBlocksTest extends KernelTestBase {
    use BlockCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'block',
        'system',
    ];
    
    /**
     * Check the enabled Bartik blocks are correctly copied over.
     */
    public function testNewDefaultThemeBlocks() {
        
        /** @var \Drupal\Core\Extension\ThemeInstallerInterface $theme_installer */
        $theme_installer = $this->container
            ->get('theme_installer');
        $default_theme = $this->config('system.theme')
            ->get('default');
        // Add two instances of the user login block.
        $this->placeBlock('user_login_block', [
            'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
        ]);
        $this->placeBlock('user_login_block', [
            'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
        ]);
        // Add an instance of a different block.
        $this->placeBlock('system_powered_by_block', [
            'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
        ]);
        // Install a different theme.
        $new_theme = 'bartik';
        // The new theme is different from the previous default theme.
        $this->assertNotEquals($new_theme, $default_theme);
        $theme_installer->install([
            $new_theme,
        ]);
        $this->config('system.theme')
            ->set('default', $new_theme)
            ->save();
        $block_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('block');
        // Ensure that the new default theme has the same blocks as the previous
        // default theme.
        $default_block_names = $block_storage->getQuery()
            ->condition('theme', $default_theme)
            ->execute();
        $new_blocks = $block_storage->getQuery()
            ->condition('theme', $new_theme)
            ->execute();
        $this->assertEquals(count($default_block_names), count($new_blocks));
        foreach ($default_block_names as $default_block_name) {
            // Remove the matching block from the list of blocks in the new theme.
            // E.g., if the old theme has block.block.stark_admin,
            // unset block.block.bartik_admin.
            unset($new_blocks[str_replace($default_theme . '_', $new_theme . '_', $default_block_name)]);
        }
        $this->assertEmpty($new_blocks);
        // Install a hidden base theme and ensure blocks are not copied.
        $base_theme = 'test_basetheme';
        $theme_installer->install([
            $base_theme,
        ]);
        $new_blocks = $block_storage->getQuery()
            ->condition('theme', $base_theme)
            ->execute();
        // Installing a hidden base theme does not copy the blocks from the default
        // theme.
        $this->assertEmpty($new_blocks);
    }

}