How to mock up appconfig value?

[Hui Zhao]

Say I have 

public class FundsTransferAuthorization

    {

        public decimal MaxTransferableAmount { get; set; }

        public decimal MinTransferableAmount { get; set; }

        private ChargeAuthorization _chargeAuthorization;

        private readonly IPromptPlayer _promptPlayer;

        public FundsTransferAuthorization(IPromptPlayer promptPlayer)

        {

            _promptPlayer = promptPlayer;

            GetAuthorizationParameters();

        }

        private void GetAuthorizationParameters()

        {

            _maxDigit = _promptPlayer.MaxDigit;

             MaxTransferableAmount = Convert.ToDecimal(GetMaximumTransferableAmount());

            MinTransferableAmount = Convert.ToDecimal(GetMinimumTransferableAmount());

        }

        public virtual string GetMinimumTransferableAmount()

        {

            return ConfigurationManager.AppSettings["minimumTransferableAmount"];

        }

        public virtual string GetMaximumTransferableAmount()

        {

            return ConfigurationManager.AppSettings["maximumTransferableAmount"];

        }

I want to mock  up MaxTransferableAmount  and MinTransferableAmount rather than reading then from app.config, how to do that?

Thanks.

[Emanuele DelBono]

Since ConfigurationManager is static you cannot mock it.

So you have 2 possible solutions:

- Encapsulate ConfigurationManager inside a class that implement an interface

- Explicitly set the value that you need in your test

     ConfigurationManager.AppSettings["minimumTransferableAmount"] = "42"; )

bye

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[Hui Zhao]

I tried the second one but why it is not working.