NSubstitutionen

NSubstitutionen is a unit testing library for the .NET platform that allows developers to create mock objects. Mocks are used to isolate the code being tested from its dependencies, enabling more focused and reliable unit tests. NSubstitutionen simplifies the process of creating and configuring these mock objects.

The core concept in NSubstitutionen is the "substitution," which is an object that replaces a real dependency. Developers can define specific behaviors for these substitutions, such as what a method should return when called or how it should behave when arguments are passed. This is achieved through a fluent API that is designed to be readable and intuitive. For instance, one can easily specify that a particular method on a substituted object should return a specific value when called with certain parameters.

NSubstitutionen supports mocking interfaces and abstract classes, as well as concrete classes. It provides mechanisms for asserting that certain methods were called on the substitutions, with or without specific arguments. This allows developers to verify that their code interacts with its dependencies as expected. The library aims to reduce the boilerplate code often associated with mocking frameworks, making the testing process more efficient. It is a popular choice in the .NET community for its ease of use and expressiveness.