}

    public void setCoreConfigToFileTree(Function<FileCollection, FileTree> coreConfigToFileTree) {
        this.coreConfigToFileTree = coreConfigToFileTree;
    }

    public void setXpackConfigToFileTree(Function<FileCollection, FileTree> xpackConfigToFileTree) {
        this.xpackConfigToFileTree = xpackConfigToFileTree;
    }

                        config.getSingleFile().toPath().resolve(RELATIVE_REST_API_RESOURCES).resolve(RELATIVE_TEST_PATH)
                    )
                );
                task.setXpackConfigToFileTree(
                    config -> project.fileTree(
                        config.getSingleFile().toPath().resolve(RELATIVE_REST_XPACK_RESOURCES).resolve(RELATIVE_TEST_PATH)
                    )
                );