trait FixGetConfigFactoryStubTrait in Purge 8.3

trait FixGetConfigFactoryStubTrait {

  /**
   * Overrides ::getConfigFactoryStub().
   *
   * @see \Drupal\Tests\UnitTestCase::getConfigFactoryStub
   *
   * @todo
   *   Lines 52-57 have been added in order to make mutable stub calls
   *   work in unit tests, e.g.: ->getEditable()->set()->save().
   *   This hasn't yet been reported to drupal.org, feel free!
   */
  public function getConfigFactoryStub(array $configs = []) {
    $config_get_map = [];
    $config_editable_map = [];

    // Construct the desired configuration object stubs, each with its own
    // desired return map.
    foreach ($configs as $config_name => $config_values) {
      $map = [];
      foreach ($config_values as $key => $value) {
        $map[] = [
          $key,
          $value,
        ];
      }

      // Also allow to pass in no argument.
      $map[] = [
        '',
        $config_values,
      ];
      $immutable_config_object = $this
        ->getMockBuilder('Drupal\\Core\\Config\\ImmutableConfig')
        ->disableOriginalConstructor()
        ->getMock();
      $immutable_config_object
        ->expects($this
        ->any())
        ->method('get')
        ->will($this
        ->returnValueMap($map));
      $config_get_map[] = [
        $config_name,
        $immutable_config_object,
      ];
      $mutable_config_object = $this
        ->getMockBuilder('Drupal\\Core\\Config\\Config')
        ->disableOriginalConstructor()
        ->getMock();
      $mutable_config_object
        ->expects($this
        ->any())
        ->method('get')
        ->will($this
        ->returnValueMap($map));
      $mutable_config_object
        ->expects($this
        ->any())
        ->method('set')
        ->will($this
        ->returnValue($mutable_config_object));
      $mutable_config_object
        ->expects($this
        ->any())
        ->method('save')
        ->will($this
        ->returnValue($mutable_config_object));
      $config_editable_map[] = [
        $config_name,
        $mutable_config_object,
      ];
    }

    // Construct a config factory with the array of configuration object stubs
    // as its return map.
    $config_factory = $this
      ->createMock('Drupal\\Core\\Config\\ConfigFactoryInterface');
    $config_factory
      ->expects($this
      ->any())
      ->method('get')
      ->will($this
      ->returnValueMap($config_get_map));
    $config_factory
      ->expects($this
      ->any())
      ->method('getEditable')
      ->will($this
      ->returnValueMap($config_editable_map));
    return $config_factory;
  }

}