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is there a way to have functional tests stopping at breakpoints when executing them in debug mode?

TestKit is the way most plugin integration testing is done

This is a discussion about plugin development.  Hence I assume that is what you mean

I'm expanding the template
```val projectDir = File("build/functionalTest")
        projectDir.mkdirs()
        projectDir.resolve("settings.gradle.kts").writeText("..")
        projectDir.resolve("build.gradle.kts").writeText("..")
        // Run the build
        val runner = GradleRunner.create()
        runner.forwardOutput()
        runner.withPluginClasspath()
        runner.withArguments("generateTerraform")
        runner.withProjectDir(projectDir)
        val result = runner.build()```

Dunno, breakpoints always JustWork for me

You must have something like `testImplementation gradleTestKit()`

unless the plugin plugin applies it automatically, but i do not believe so

anyway, sorru i cannot help as breakpoints always just work for me.  though i use Java based testing

unfortunately `testImplementation(gradleTestKit())` didn't work
just to be double sure, you simply execute the test via the Idea gui (column on top left) choosing the debug option and that is?

Yes.  In fact I can even set breakpoints in the build script

Dunno, like I said you use a different approach for testng (Groovy it seems) whereas I use Java.  And I assume you then use Groovy for implementing the plugin (which is not the recommendation as far as I understood).  So that may all factor into it

I'll step away from trying to help as you have a very different set up

See <https://docs.gradle.org/current/userguide/test_kit.html#sub:test-kit-debug>

awesome, `withDebug(true)` works as a charm, thanks!