How do I mock dependencies in MVVM tests?

How do I mock dependencies in MVVM tests?

To mock dependencies in MVVM tests, you can use a mocking framework like Moq or NSubstitute. These tools allow you to create mock objects that simulate the behavior of real dependencies.

Can you give me an example of using Moq for this?

Sure! Here's a simple example:

var mockService = new Mock<IMyService>();
mockService.Setup(s => s.GetData()).Returns(new List<string> { "data1", "data2" });

var viewModel = new MyViewModel(mockService.Object);

This sets up a mock for IMyService that returns a predefined list when GetData is called.

What about testing commands in the ViewModel?

For testing commands, you can invoke the command directly in your test. Ensure that the command's execution logic is triggered and verify the expected outcomes.

Are there any best practices for mocking in MVVM?

Yes, some best practices include: keep your mocks simple, avoid over-mocking, and ensure your tests are focused on one behavior at a time.