class ConfigSnapshotTest

class ConfigSnapshotTest extends DrupalUnitTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'config_test',
    'system',
  );
  public static function getInfo() {
    return array(
      'name' => 'Snapshot functionality',
      'description' => 'Config snapshot creation and updating.',
      'group' => 'Configuration',
    );
  }
  public function setUp() {
    parent::setUp();
    $this
      ->installSchema('system', 'config_snapshot');
  }

  /**
   * Tests config snapshot creation and updating.
   */
  function testSnapshot() {
    $active = $this->container
      ->get('config.storage');
    $staging = $this->container
      ->get('config.storage.staging');
    $snapshot = $this->container
      ->get('config.storage.snapshot');
    $config_name = 'config_test.system';
    $config_key = 'foo';
    $new_data = 'foobar';
    $active_snapshot_comparer = new StorageComparer($active, $snapshot);
    $staging_snapshot_comparer = new StorageComparer($staging, $snapshot);

    // 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.
    config_install_default_config('module', 'config_test');

    // Although we have imported config this has not affected the snapshot.
    $this
      ->assertTrue($active_snapshot_comparer
      ->reset()
      ->hasChanges());

    // Update the config snapshot.
    config_import_create_snapshot($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 staging.
    $staging_data = config($config_name)
      ->get();
    $staging_data[$config_key] = $new_data;
    $staging
      ->write($config_name, $staging_data);

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

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

    // Verify changed config was properly imported.
    $this
      ->assertIdentical(config($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());
  }

}