I am able to test dcl plugins using Gradle test kit without any issue. But I need to configure a project with additional data not supported by dcl, so I need to use

org.gradle.kotlin.dsl.dcl=true

but then tests are failing with:

ScriptCompilationException(scriptCompilationErrors=[...])

Is there any workaround?

could you please provide a bit more information on the errors?

I moved my code to the settings script with

gradle.lifecycle.beforeProject

as a workaround. But I think it is the same error you get when you were not adding

org.gradle.kotlin.dsl.dcl=true

outside of Gradle test kit