/**
  * Tests whether constructor sets value normalizer callback correctly.
  *
  * @return void
  */
 public function testConstructorSetsValueNormalizerCallback()
 {
     $callback = $this->getToLowerCaseCallback();
     $map = new NormalizingMap(null, $callback);
     $this->assertSame($callback, $map->getValueNormalizerCallback());
 }