public void TextResponseTest()
        {
            // Arrange
            EncryptedText.Text = "ыърчбфэ".ToUpper();
            Key.Text           = "КЛЮЧ";
            DecryptController decryptController = new DecryptController();

            // Act
            var result = decryptController.CreateResponse() as ContentResult;


            // Assert
            Assert.Equal("РОТАЦИЯ", result?.Content);
        }