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<?php

namespace Drupal\KernelTests\Core\Config;

use Drupal\Core\Config\StorageComparer;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests config snapshot creation and updating.
 *
 * @group config
 */
class ConfigSnapshotTest extends KernelTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = ['config_test', 'system'];

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->installConfig(['system']);
    // Update the config snapshot. This allows the parent::setUp() to write
    // configuration files.
    \Drupal::service('config.manager')->createSnapshot(\Drupal::service('config.storage'), \Drupal::service('config.storage.snapshot'));
    $this->copyConfig($this->container->get('config.storage'), $this->container->get('config.storage.sync'));
  }

  /**
   * Tests config snapshot creation and updating.
   */
  public function testSnapshot() {
    $active = $this->container->get('config.storage');
    $sync = $this->container->get('config.storage.sync');
    $snapshot = $this->container->get('config.storage.snapshot');
    $config_manager = $this->container->get('config.manager');
    $config_name = 'config_test.system';
    $config_key = 'foo';
    $new_data = 'foobar';

    $active_snapshot_comparer = new StorageComparer($active, $snapshot, $config_manager);
    $sync_snapshot_comparer = new StorageComparer($sync, $snapshot, $config_manager);

    // Verify that we have an initial snapshot that matches the active
    // configuration. This has to be true as no config should be installed.
    $this->assertFalse($active_snapshot_comparer->createChangelist()->hasChanges());

    // Install the default config.
    $this->installConfig(['config_test']);
    // Although we have imported config this has not affected the snapshot.
    $this->assertTrue($active_snapshot_comparer->reset()->hasChanges());

    // Update the config snapshot.
    \Drupal::service('config.manager')->createSnapshot($active, $snapshot);

    // The snapshot and active config should now contain the same config
    // objects.
    $this->assertFalse($active_snapshot_comparer->reset()->hasChanges());

    // Change a configuration value in sync.
    $sync_data = $this->config($config_name)->get();
    $sync_data[$config_key] = $new_data;
    $sync->write($config_name, $sync_data);

    // Verify that active and snapshot match, and that sync doesn't match
    // active.
    $this->assertFalse($active_snapshot_comparer->reset()->hasChanges());
    $this->assertTrue($sync_snapshot_comparer->createChangelist()->hasChanges());

    // Import changed data from sync to active.
    $this->configImporter()->import();

    // Verify changed config was properly imported.
    \Drupal::configFactory()->reset($config_name);
    $this->assertIdentical($this->config($config_name)->get($config_key), $new_data);

    // Verify that a new snapshot was created which and that it matches
    // the active config.
    $this->assertFalse($active_snapshot_comparer->reset()->hasChanges());
  }

}