diff --git a/tests/testthat/test-adj_range.R b/tests/testthat/test-adj_range.R
index 6350ea1c..6e09a892 100644
--- a/tests/testthat/test-adj_range.R
+++ b/tests/testthat/test-adj_range.R
@@ -1,3 +1,5 @@
+library(data.table)
+
 test_that("restrict_range() provides correct range", {
   test_noise <- as_OpenSpecy(x = seq(400,4000, by = 10),
                              spectra = data.table(intensity = rnorm(361)))
@@ -41,8 +43,9 @@ test_that("flatten_range() function test", {
   expect_false(all.equal(flat_map$spectra, tiny_map$spectra) |> isTRUE())
   expect_equal(flat_map$spectra[1:20], tiny_map$spectra[1:20])
 
-  expect_equal(flat_map$spectra[40:60, 1:5] |> unique() |> round(4),
-               data.table(-0.8694, -0.7769, -0.5828, -0.292, 0.1916))
+  expect_equal(flat_map$spectra[40:60, 1:5] |> unique() |> round(4)
+               |> as.numeric(),
+               c(-0.8694, -1.246, -0.8304, -1.1909, -0.7857))
 })
 
 test_that("flatten_range() error handling", {
diff --git a/tests/testthat/test-def_features.R b/tests/testthat/test-def_features.R
index 5cf68c05..25fec60c 100644
--- a/tests/testthat/test-def_features.R
+++ b/tests/testthat/test-def_features.R
@@ -1,19 +1,19 @@
 map <- read_extdata("CA_tiny_map.zip") |> read_any()
 
 test_that("features are identified when given logical", {
-  map$metadata$particles <- map$metadata$x == 0
+  map$metadata$particles <- map$metadata$y == 0
   id_map <- def_features(map, map$metadata$particles)
-  expect_true(length(unique(id_map$metadata$feature_id)) == 2)
-  expect_true(max(id_map$metadata$area, na.rm = T) == 13)
-  expect_true(max(id_map$metadata$feret_max, na.rm = T) == 13)
+  expect_length(unique(id_map$metadata$feature_id), 2)
+  expect_equal(max(id_map$metadata$area, na.rm = T), 13)
+  expect_equal(max(id_map$metadata$feret_max, na.rm = T), 13)
 })
 
 test_that("particles are identified when given character", {
-  map$metadata$particles <- ifelse(map$metadata$x == 1, "particle", "not_particle")
+  map$metadata$particles <- ifelse(map$metadata$y == 1, "particle", "not_particle")
   id_map <- def_features(map, map$metadata$particles)
-  expect_true(length(unique(id_map$metadata$feature_id)) == 3)
-  expect_true(max(id_map$metadata$area, na.rm = T) == 182)
-  expect_true(round(max(id_map$metadata$feret_max, na.rm = T)) == 19)
+  expect_length(unique(id_map$metadata$feature_id), 3)
+  expect_equal(max(id_map$metadata$area, na.rm = T), 182)
+  expect_equal(round(max(id_map$metadata$feret_max, na.rm = T)), 19)
 })
 
 test_that("an error is thrown for invalid feature input", {
@@ -46,21 +46,21 @@ test_that("the original spectrum remains unmodified and metadata is amended", {
 })
 
 test_that("collapse particles returns expected values", {
-  particles <- ifelse(map$metadata$x == 1, "particleA", "particleB")
+  particles <- ifelse(map$metadata$y == 1, "particleA", "particleB")
   id_map <- def_features(map, particles)
   test_collapsed <- collapse_spec(id_map)
 
   expect_equal(test_collapsed$metadata |> nrow(), 3)
   expect_equal(test_collapsed$metadata$feret_max |> round(2), c(13, 13, 18.69))
-  expect_equal(test_collapsed$metadata$centroid_y |> unique(), 6)
+  expect_equal(test_collapsed$metadata$centroid_x |> unique(), 6)
 
-  particles <- map$metadata$x == 1
+  particles <- map$metadata$y == 1
   id_map <- def_features(map, particles)
   test_collapsed <- collapse_spec(id_map)
 
   expect_equal(test_collapsed$metadata |> nrow(), 2)
   expect_equal(test_collapsed$metadata$feret_max |> round(2), c(NA, 13))
-  expect_equal(test_collapsed$metadata$centroid_y |> unique(), 6)
+  expect_equal(test_collapsed$metadata$centroid_x |> unique(), 6)
 
   expect_contains(names(test_collapsed$metadata),
                   c("feature_id", "area", "feret_max", "centroid_y",
diff --git a/tests/testthat/test-read_envi.R b/tests/testthat/test-read_envi.R
index df7f2b1d..dc48dad4 100644
--- a/tests/testthat/test-read_envi.R
+++ b/tests/testthat/test-read_envi.R
@@ -1,5 +1,5 @@
 test_that("ENVI files are read", {
-  expect_message(tiny_map <- read_zip(read_extdata("CA_tiny_map.zip")))
+  tiny_map <- read_zip(read_extdata("CA_tiny_map.zip"))
   expect_s3_class(tiny_map, "OpenSpecy")
 
   expect_equal(ncol(tiny_map$spectra), 208)