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kotlinlang

Has anyone tried writing tests for incremental scenarios? I <https://github.com/tschuchortdev/kotlin-compile-testing/issues/206|don’t think it’s currently possible> with `kotlin-compile-testing` (e.g. it <https://github.com/tschuchortdev/kotlin-compile-testing/blob/1a94ee12944d4ca33a937cf0b2332ca64eec4320/ksp/src/main/kotlin/com/tschuchort/compiletesting/Ksp.kt#L144-L187|fully wipes output directories on each KSP run>, and <https://github.com/google/ksp/blob/4eac97bc973eb4c9ed4b0ce25d09f671c161cc7a/gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt|a bunch of the KSP incremental behaviour is implemented by the Gradle plugin rather than the compiler plugin><https://github.com/google/ksp/blob/4eac97bc973eb4c9ed4b0ce25d09f671c161cc7a/gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt))|)>.

Is my best bet more of an integration test, maybe using Gradle TestKit?

we have <https://github.com/google/ksp/blob/main/integration-tests/src/test/kotlin/com/google/devtools/ksp/test/IncrementalIT.kt|some> integration tests for incremental scenario in KSP code, we use gradle runner to simulate incremental scenarios, hope this can help.

Ah yeah that’s helpful, thanks! I need to figure out how to inject my real symbol processor into the test rather than one from a module in the test project, but that seems doable, probably with an <https://docs.gradle.org/current/userguide/composite_builds.html|included build>.