The Game Test Framework is a powerful tool provided by Mojang that is included with Minecraft in 1.17 and up. It allows you to declare game tests that can be run inside a Minecraft world and provide a success or fail state. Game tests are similar in concept to unit tests, but they allow you to interact with a running instance of Minecraft. This means you can test block interactions, entity interactions, item functionality, etc. Game tests use template structures to define the dimensions of the test and what blocks and entities will start in the test structure. This framework has useful applications for Continuous Integration (CI) and testing during development to ensure features are working as expected.
For a more in-depth explanation about the Game Test Framework itself and how Mojang uses it to test the base game, please see this video with contributions by Dinnerbone. This guide is tailored towards Forge modders by expla