The directory fegen-example-gradle contains an example project that demonstrates how FeGen can be used to generate Typescript and Kotlin code based on a Spring application that simplifies using the REST API provided by Spring.
The sub projects kotlin-api and web-api also contain tests for the code generated by FeGen.
If you checked out the fegen-examples project as part of the fegen repository and want to test the changes you made to FeGen, comment in the following line in settings.gradle:
includeBuild '..'
There is also a maven example in fegen-example-maven demonstrating how to include FeGen in a maven project.
However, if you are interested in examples of the generated code being used, you should refer to the gradle example as it is far more complete.