Hands-On Design Patterns with C# and .NET Core

Helper TestUserInterface

As part of a unit test of one of the InventoryCommand implementations, we do not want to test the referenced dependencies. Fortunately, because the commands adhere to the DIP, we can create a helper class to validate the implementation interactions with the dependencies. One of the dependencies is the IUserInterface, which is passed into the implementation in the constructor. The following is a reminder of the methods of the interface:

public interface IUserInterface : IReadUserInterface, IWriteUserInterface { }public interface IReadUserInterface{    string ReadValue(string message);}public interface IWriteUserInterface{    void WriteMessage(string message);    void WriteWarning(string message);}

By implementing a helper