This is the Technology Compatibility Kit (TCK) for Jakarta Batch.
The Jakarta Batch specification describes the job specification language, Java programming model, and runtime environment for Jakarta Batch applications.
This distribution, as a whole, is licensed under the terms of the Eclipse Foundation Technology Compatibility Kit License - v 1.0 (see LICENSE_EFTL.md included within this zip file).
In the doc/ subdirectory the batch-tck-reference-guide-<version>.pdf/html documents describe the components of the TCK in more detail and also more explicitly enumerate the steps required to pass the TCK, claim compatibility, as well as other processes like how to file a challenge against the TCK for a test that you believe to be invalid.