What are some advanced mocking techniques using NSubstitute?

What are some advanced mocking techniques using NSubstitute?

NSubstitute offers several advanced mocking techniques, such as argument constraints, callback setups, and more. Would you like to explore a specific technique?

Can you explain how to use argument constraints?

Sure! Argument constraints allow you to specify conditions for the arguments passed to a method. For example, you can use Arg.Is<T>(x => x > 0) to mock a method that only accepts positive integers.

What about setting up callbacks?

Callbacks in NSubstitute can be set up using the Returns method. You can define a callback that executes when a method is called, allowing you to manipulate the state or return different values based on the input.

Are there any best practices for using NSubstitute?

Yes, some best practices include keeping your tests isolated, using clear and descriptive names for your substitutes, and avoiding over-mocking to maintain test readability.