如何在单元测试中模拟自定义类？

问题描述

我正在使用Xunit.net对应用程序服务进行单元测试。



由于以下声明，我的单元测试用例未得到部分执行：

StringCipher stringCipher = new StringCipher（）;



StringCipher是我编写密码加密和解密逻辑的类。



即使它进入StringCipher类的构造函数，但在构造函数中抛出异常：

I am doing the unit testing of application service using Xunit.net.

My unit test case is not getting partially executed because of following statement:
StringCipher stringCipher = new StringCipher();

StringCipher is class in which I have written the logic for password encryption and decryption.

Even it goes inside the constructor of StringCipher class but throwing exception inside the constructor:

public class StringCipher
{
private readonly byte[] _initVectorBytes = null;
        private const int KeySize = 256;
        public StringCipher()
        {
            _initVectorBytes = Encoding.ASCII.GetBytes(ConfigurationManager.AppSettings["PasswordEncryptionKey"]);
        }
}

请让我知道如何解决这个问题问题？

Please let me know how can I resolve this issue?

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