class ConfigDiffTest

class ConfigDiffTest extends DrupalUnitTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'config_test',
    'system',
  );
  public static function getInfo() {
    return array(
      'name' => 'Diff functionality',
      'description' => 'Calculating the difference between two sets of configuration.',
      'group' => 'Configuration',
    );
  }

  /**
   * Tests calculating the difference between two sets of configuration.
   */
  function testDiff() {
    $active = $this->container
      ->get('config.storage');
    $staging = $this->container
      ->get('config.storage.staging');
    $config_name = 'config_test.system';
    $change_key = 'foo';
    $remove_key = '404';
    $add_key = 'biff';
    $add_data = 'bangpow';
    $change_data = 'foobar';
    $original_data = array(
      'foo' => 'bar',
      '404' => 'herp',
    );

    // Install the default config.
    config_install_default_config('module', 'config_test');

    // Change a configuration value in staging.
    $staging_data = $original_data;
    $staging_data[$change_key] = $change_data;
    $staging_data[$add_key] = $add_data;
    $staging
      ->write($config_name, $staging_data);

    // Verify that the diff reflects a change.
    $diff = config_diff($active, $staging, $config_name);
    $this
      ->assertEqual($diff->edits[0]->type, 'change', 'The first item in the diff is a change.');
    $this
      ->assertEqual($diff->edits[0]->orig[0], $change_key . ': ' . $original_data[$change_key], format_string("The active value for key '%change_key' is '%original_data'.", array(
      '%change_key' => $change_key,
      '%original_data' => $original_data[$change_key],
    )));
    $this
      ->assertEqual($diff->edits[0]->closing[0], $change_key . ': ' . $change_data, format_string("The staging value for key '%change_key' is '%change_data'.", array(
      '%change_key' => $change_key,
      '%change_data' => $change_data,
    )));

    // Reset data back to original, and remove a key
    $staging_data = $original_data;
    unset($staging_data[$remove_key]);
    $staging
      ->write($config_name, $staging_data);

    // Verify that the diff reflects a removed key.
    $diff = config_diff($active, $staging, $config_name);
    $this
      ->assertEqual($diff->edits[0]->type, 'copy', 'The first item in the diff is a copy.');
    $this
      ->assertEqual($diff->edits[1]->type, 'delete', 'The second item in the diff is a delete.');
    $this
      ->assertEqual($diff->edits[1]->orig[0], $remove_key . ': ' . $original_data[$remove_key], format_string("The active value for key '%remove_key' is '%original_data'.", array(
      '%remove_key' => $remove_key,
      '%original_data' => $original_data[$remove_key],
    )));
    $this
      ->assertFalse($diff->edits[1]->closing, format_string("The key '%remove_key' does not exist in staging.", array(
      '%remove_key' => $remove_key,
    )));

    // Reset data back to original and add a key
    $staging_data = $original_data;
    $staging_data[$add_key] = $add_data;
    $staging
      ->write($config_name, $staging_data);

    // Verify that the diff reflects an added key.
    $diff = config_diff($active, $staging, $config_name);
    $this
      ->assertEqual($diff->edits[0]->type, 'copy', 'The first item in the diff is a copy.');
    $this
      ->assertEqual($diff->edits[1]->type, 'add', 'The second item in the diff is an add.');
    $this
      ->assertFalse($diff->edits[1]->orig, format_string("The key '%add_key' does not exist in active.", array(
      '%add_key' => $add_key,
    )));
    $this
      ->assertEqual($diff->edits[1]->closing[0], $add_key . ': ' . $add_data, format_string("The staging value for key '%add_key' is '%add_data'.", array(
      '%add_key' => $add_key,
      '%add_data' => $add_data,
    )));
  }

}