public function testGetEmpty()
{
$data = [['key1' => 'value1'], ['key2' => 'value2']];
$fileReader = new DummyFileReader();
$jsonFileReader = new Json($fileReader);
$jsonFileReader->write($data);
$fileManager = new FileManager($jsonFileReader);
$result = $fileManager->get(2);
$this->assertNull($result);
}
