public function testModifyListEmpty()
{
$fileReader = new DummyFileReader();
$jsonFileReader = new Json($fileReader);
$fileManager = new FileManager($jsonFileReader);
$result = $fileManager->modifyList([0 => ['key3' => 'value3']]);
$this->assertSame(0, $result);
$result = $fileManager->getAll();
$this->assertSame([], $result);
}
