Any testing suggestions on replace a 3rd-party production?

Question

It's a complex 3rd-party DLL. Phase 1 for My project already finished. I need find a good way to integrate testing with both my DLLs and 3rd-party DLL.

Now I need to replace the 3rd-party DLL with some of my my small DLLs step by step.

All the interface member are same names.

How to disable some of the 3rd-party DLL reference and enable related my small DLL? Thank you.

Answer 1

If you are using an interface and the 3rd party DLL implements that interface, you can define a new class implementing the same interface. In this case, instanciation of the classes will have to be changed. Change the code like IMyInterface InstanceObject = new ExternalClass(); with IMyInterface InstanceObject = new MyClass();

You can use this technique if uou are not using interface also. In this case you shall have to change like ExternalClass InstanceObject = new ExternalClass(); with MyClass InstanceObject = new MyClass();

Answer 2

You can hide the calls to the 3rd party library behind interfaces. You can define your own set of interfaces and use a Inversion of Control framework (or roll your own) that gets an implementation based on the interface and configure the actual implementation in the startup path of your application or in a configuration file (depending on the IoC framework you use).