if (helper_skip()) {

  context("vdiffr")
  test_that("vdiffr", {
    set.seed(42)
    ctr <- theophylline()
    args <- commandArgs(trailingOnly = TRUE)

    if (length(args) == 0) {
      wd <- getwd()
    } else if (length(args) == 1) {
      # output directory
      wd <- args[1]
    } else {
      stop("More than one argument was supplied! Need only 1 - root output directory", call. = FALSE)
    }

    f1 <- function(x) {
      pmx_plot_abs_iwres_ipred(x)
    }
    f2 <- function(x) {
      pmx_plot_iwres_ipred(x)
    }
    f3 <- function(x) {
      pmx_plot_iwres_time(x)
    }
    f4 <- function(x) {
      pmx_plot_iwres_dens(x)
    }
    f5 <- function(x) {
      pmx_plot_iwres_qq(x)
    }
    f6 <- function(x) {
      pmx_plot_npde_time(x)
    }
    f7 <- function(x) {
      pmx_plot_npde_pred(x)
    }
    f8 <- function(x) {
      pmx_plot_npde_qq(x)
    }
    f9 <- function(x) {
      pmx_plot_dv_pred(x)
    }
    f10 <- function(x) {
      pmx_plot_individual(x)
    }
    f11 <- function(x) {
      pmx_plot_dv_ipred(x)
    }
    f12 <- function(x) {
      pmx_plot_eta_hist(x)
    }
    f13 <- function(x) {
      pmx_plot_eta_box(x)
    }
    f14 <- function(x) {
      pmx_plot_eta_matrix(x)
    }
    f15 <- function(x) {
      pmx_plot_eta_cats(x)
    }
    f16 <- function(x) {
      pmx_plot_eta_conts(x)
    }
    f17 <- function(x) {
      pmx_plot_eta_qq(x)
    }
    f18 <- function(x) {
      pmx_plot_vpc(x)
    }
    fun_list <- list(
      fun_pmx_plot_abs_iwres_ipred = f1,
      fun_pmx_plot_iwres_ipred = f2,
      fun_pmx_plot_iwres_time = f3,
      fun_pmx_plot_iwres_dens = f4,
      fun_pmx_plot_iwres_qq = f5,
      fun_pmx_plot_npde_time = f6,
      fun_pmx_plot_npde_pred = f7,
      fun_pmx_plot_npde_qq = f8,
      fun_pmx_plot_dv_pred = f9,
      fun_pmx_plot_individual = f10,
      fun_pmx_plot_dv_ipred = f11,
      fun_pmx_plot_eta_hist = f12,
      fun_pmx_plot_eta_box = f13,
      fun_pmx_plot_eta_matrix = f14,
      fun_pmx_plot_eta_cats = f15,
      fun_pmx_plot_eta_qq = f17,
      fun_pmx_plot_vpc = f18,
      fun_pmx_plot_eta_conts = f16
    )

    lapply(
      c(names(fun_list)),
      function(n) {
        vdiffr::expect_doppelganger(n, fun_list[[n]](ctr))
      }
    )
  })
}