public void AesEncryptedSize()
{
var aesKey = _aes.GenerateKey();
var encryptedData = _aes.Encrypt("test data", aesKey);
Assert.AreEqual(44, encryptedData.Length);
Assert.AreEqual("=", encryptedData.Substring(43, 1));
Assert.AreNotEqual("=", encryptedData.Substring(42, 1));
}