How to unit test and mock SharePoint service functionality using PnP Framework and Moq?

Question

I'm working on a project where I need to unit test a service that interacts with SharePoint using the PnP Framework. The service calls PnP methods, and I want to mock these methods in my unit tests to avoid actual SharePoint calls.

Here's what I'm trying to achieve:

• Mock the PnP functionality so I can test the business logic without actually calling SharePoint.
• Use Moq or another mocking library (e.g., NSubstitute, FakeItEasy) to mock PnP objects.
• Ensure the unit tests are isolated, so they don't rely on real SharePoint data or API responses.

Questions:

1. How do I correctly mock PnP Framework methods like GetByTitle, GetItemById, and GetAsync using Moq?
2. How can I mock asynchronous methods in PnP when they are chained together like in the example above?
3. Are there any PnP-specific mocking strategies that I should be aware of?
4. Do I need to mock the individual PnP objects, or is there a higher-level approach to mocking the SharePoint service interaction as a whole?

Any guidance or code examples would be greatly appreciated!