Hey everyone I am looking for a sample or best practices to

Question

Hey everyone I am looking for a sample or best practices to test an annotation processor with Kotlin I ve something that works quite well for Java and was wondering how I could do the same with Kotlin knowing that I ll probably have to do something kotlin specific in there

tddmonkey · Answer

I ve been looking at that lately Ended up using Avatar where I could but you need Java code for that then backing off to a multi module project and having the tests in the second module depending on kapt being run first

Stéphane Nicoll · Answer

Thanks for the reply Do you have a sample somewhere

Stéphane Nicoll · Answer

It s a general purpose library that supports primarily Java with official support for Kotlin so we re trying to make sure our stuff works in an idiomatic way with Kotlin

Stéphane Nicoll · Answer

I guess I can live with the separate modules for the kotlin specific tests even if that makes debugging quite annoying

tddmonkey · Answer

I don t have a sample as it s not open sourced at the moment

tddmonkey · Answer

The secondary module testing wasn t that much just places where kotlin differs in a way you can t replicate in Java

Stéphane Nicoll · Answer

How does that work practically You re generating kapt in the second module and then compiling the generated java source

Stéphane Nicoll · Answer

I was hoping I could do that from the test actually

tddmonkey · Answer

``` module 1 gt the annotation processor gt Avatar for unit testing Java sources in `src test java` that have the annotation processor applied Avatar lets you inspect the output processing module 2 gt the other tests gt Run `kapt` have tests verify the output of the annotation processor ```

tddmonkey · Answer

Within module 1 it s a standard test cycle Avatar runs from within the test so it s just a case of running the test modifying the code running the test Module 2 requires kapt to run so it s more long winded

Stéphane Nicoll · Answer

I am not using avatar but I am triggering the compiler from a unit test that works quite well for me <https github com spring projects spring boot blob adea7014a9c48845c17de8a23dc32782845058ee spring boot project spring boot tools spring boot configuration processor src test java org springframework boot configurationprocessor AbstractMetadataGenerationTests java L49 L54>

Stéphane Nicoll · Answer

I guess I need a way to generate the Java source code I don t need to trigger the AP really I can do that once the Java source code has been generated

tddmonkey · Answer

Generate the input source code

Stéphane Nicoll · Answer

The javasource code that kapt generates from the kotlin counter part

Stéphane Nicoll · Answer

If I have that I am happy as I can run the compiler the same way I do for the Java stuff

tddmonkey · Answer

Ah I see I know of no better way than actually running kapt then