public function mappingPersistentEntityAllowsToSetValueToNull()
{
$entityIdentity = $this->createTestEntity();
$source = ['__identity' => $entityIdentity, 'averageNumberOfKids' => ''];
$result = $this->propertyMapper->convert($source, Fixtures\TestEntity::class);
$this->assertSame('Egon Olsen', $result->getName());
$this->assertSame(42, $result->getAge());
$this->assertSame(null, $result->getAverageNumberOfKids());
}