on { runCompileBuildOperation(any(), any(), any()) } doAnswer { it.getArgument<() -> String>(2)() }

            on {
                cachedDirFor(
                    any(),
                    eq(stage1ProgramId),
                    same(testRuntimeClassPath),
                    same(accessorsClassPath),
                    any()
                )

            programId: ProgramId
        ): CompiledScript?

        fun cache(
            specializedProgram: CompiledScript,
            programId: ProgramId
        )

        fun cachedDirFor(
            scriptHost: KotlinScriptHost<*>,
            programId: ProgramId,
            compilationClassPath: ClassPath,
            accessorsClassPath: ClassPath,
            initializer: (File) -> Unit

        override fun cachedClassFor(programId: ProgramId): CompiledScript? =
            null

        override fun cache(specializedProgram: CompiledScript, programId: ProgramId) = Unit

        override fun cachedDirFor(
            scriptHost: KotlinScriptHost<*>,
            programId: ProgramId,
            compilationClassPath: ClassPath,
            accessorsClassPath: ClassPath,
            initializer: (File) -> Unit

            programId: ProgramId
        ) {
            classloadingCache.put(
                programId,
                specializedProgram
            )
        }

        override fun cachedDirFor(
            scriptHost: KotlinScriptHost<*>,
            programId: ProgramId,
            compilationClassPath: ClassPath,
            accessorsClassPath: ClassPath,
            initializer: (File) -> Unit