I developed and published an open source project for unit/integration testing Sitecore projects. The project is a library that deserializes Rainbow (.yml) files into FakeDb items and templates. The source code is available on Github and the library can be imported into project with nuget.
The purpose of this project is to make it easier to seed data in the Sitecore FakeDb testing framework. Many Sitecore solutions use Unicorn data-syncing which produce Rainbow files. Since these files already have the data used for a solution, my project translates the data for Sitecore FakeDb so it can be used in tests.
Sitecore FakeDb stopped being actively developed around 2019 as newer versions of Sitecore made it easier to test and patterns like Sitecore Helix became popular. The author, Serhii Shushliapin, wrote this post in December 2019 about how to switch from FakeDb to a Mocking framework like AutoFixture: