/**
* Tests config snapshot creation and updating.
*/
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(array('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());
}