diff --git a/tests/testthat/test-jnd2xyz.R b/tests/testthat/test-jnd2xyz.R
index 3498d6ff..d47de3bc 100644
--- a/tests/testthat/test-jnd2xyz.R
+++ b/tests/testthat/test-jnd2xyz.R
@@ -7,6 +7,13 @@ test_that("JND space for dichromat", {
 
   jnd_x <- jnd2xyz(cd.flowers, rotate = FALSE)
 
+  # After conversion to coordinates, the distance should not be modified
+  expect_equal(
+    as.matrix(dist(jnd_x, diag = TRUE, upper = TRUE)),
+    coldist2mat(cd.flowers)[["dS"]],
+    tolerance = 1e-6
+  )
+
   jnd_x_rot <- jnd2xyz(cd.flowers, rotate = TRUE)
 
   expect_snapshot(jnd_x_rot)
@@ -27,6 +34,12 @@ test_that("JND space for trichromat", {
 
   jnd_xy <- jnd2xyz(cd.flowers, rotate = FALSE)
 
+  # After conversion to coordinates, the distance should not be modified
+  expect_equal(
+    as.matrix(dist(jnd_xy, diag = TRUE, upper = TRUE)),
+    coldist2mat(cd.flowers)[["dS"]]
+  )
+
   jnd_xy_rot <- jnd2xyz(cd.flowers, rotate = TRUE)
 
   expect_snapshot(jnd_xy_rot)
@@ -47,6 +60,13 @@ test_that("JND space for tetrachromat", {
 
   jnd_xyz <- jnd2xyz(cd.flowers, rotate = FALSE)
 
+  # After conversion to coordinates, the distance should not be modified
+  expect_equal(
+    as.matrix(dist(jnd_xyz, diag = TRUE, upper = TRUE)),
+    coldist2mat(cd.flowers)[["dS"]],
+    tolerance = 1e-6
+  )
+
   jnd_xyz_rot <- jnd2xyz(cd.flowers, rotate = TRUE)
 
   expect_snapshot(jnd_xyz_rot)