test_that("mean_stack_thresh works", {
  img <- ijtiff::read_tif(system.file("extdata", "50.tif",
    package = "autothresholdr"
  ), msg = FALSE)
  expect_equal(
    mean_stack_thresh(
      img[, , 1, , drop = FALSE],
      "Tri"
    ),
    mean_stack_thresh(
      img[, , rep(1, 3), , drop = FALSE],
      "t"
    )[, , 1, , drop = FALSE],
    ignore_attr = TRUE
  )
  img_thresh_mask <- mean_stack_thresh(img, "Otsu")
  expect_equal(round(mean(img_thresh_mask, na.rm = TRUE), 2), 24.09)
  img_thresh_mask <- mean_stack_thresh(img, 13.2)
  expect_equal(round(mean(img_thresh_mask, na.rm = TRUE), 2), 24.08)
  img_thresh_mask <- mean_stack_thresh(img + 2^30, "Otsu")
  expect_equal(round(mean(img_thresh_mask, na.rm = TRUE)), 24 + 2^30)
  const_arr <- array(2, dim = rep(2, 3))
  expect_error(mean_stack_thresh(const_arr, "tri"))
  real_arr <- array(seq(2, 3, length.out = 8), dim = rep(2, 3))
  expect_error(mean_stack_thresh(real_arr, "tri"), "integer")
  expect_equal(sum(var_pillars(const_arr)), 0)
  img_thresh_mask <- med_stack_thresh(img, "Triangle")
  expect_equal(round(mean(img_thresh_mask, na.rm = TRUE), 3), 23.583)
  expect_error(
    mean_stack_thresh(img + 2^32, "Triangle"),
    "All elements .* must be in the integer range"
  )
  expect_error(
    med_stack_thresh(img + 2^32, "Triangle"),
    "All elements .* must be in the integer range"
  )
  img_thresh_mask <- mean_stack_thresh(img + 2^30, "Otsu")
  expect_equal(round(mean(img_thresh_mask, na.rm = TRUE)), 24 + 2^30)
  const_arr <- array(2, dim = rep(2, 3))
  expect_error(mean_stack_thresh(const_arr, "tri"))
  expect_error(med_stack_thresh(const_arr, "tri"))
  expect_equal(sum(var_pillars(const_arr)), 0)
  real_arr <- array(seq(2, 3, length.out = 8), dim = rep(2, 3))
  expect_error(med_stack_thresh(real_arr, "tri"), "integer")
  expect_error(
    mean_stack_thresh(img %T>% {
      .[] <- NA
    }, "otsu"),
    paste0(
      "`img` cannot be all `NA`s.+Every element of your `img`\\s?",
      "is `NA`."
    )
  )
  expect_error(
    med_stack_thresh(img %T>% {
      .[] <- NA
    }, "otsu"),
    paste0(
      "`img` cannot be all `NA`s.+Every element of your `img`\\s?",
      "is `NA`."
    )
  )
})