public function mappingPersistentEntityOnlyChangesModifiedProperties()
{
$entityIdentity = $this->createTestEntity();
$source = ['__identity' => $entityIdentity, 'averageNumberOfKids' => '5.5'];
$result = $this->propertyMapper->convert($source, Fixtures\TestEntity::class);
$this->assertSame('Egon Olsen', $result->getName());
$this->assertSame(42, $result->getAge());
$this->assertSame(5.5, $result->getAverageNumberOfKids());
}