Using IoC for Unit Testing

Question

How can a IoC Container be used for unit testing? Is it useful to manage mocks in a huge solution (50+ projects) using IoC? Any experiences? Any C# libraries that work well

Answer 1

Using containers with ability to resolve unregistered/uknown services like SimpleInjector, DryIoc (its mine) can return mocks for not yet implemented interfaces.

Which means that you can start development with first simple implementation and its mocked dependencies, and replace them with real thing as you progress.