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SAS is an acronym that stands for Scenario/API/Simulator which are 3 main pillars to build readable and maintenable acceptance tests for .Net Core applications. A description of this concept can be found in this article (currently in French; coming soon in English).

This library aims to relieve the developers of the burden of writing boilerplate code to wirte such tests.

• Scenario is the test business context. There isn't much the library can do here as this is completely business-oriented.
• API is basically a way to instanciate the whole API under test in memory. In .Net Core, that means using WebApplicationFactory under the hood.
• A Simulator is a stub that will simulate a specific layer of the code. Since we are talking about acceptance tests here, simulators are usually stubs to infra layers (e.g. database interaction, third-party REST service, etc...).

There are several available packages that target different needs and offer various helpers.

You can find an example code that uses the library here.