Restore old assertion and mark xfail

Author: mfisher87

test/test_editor_loads_native.py

@@ -1,5 +1,6 @@
 import json
 
+import numpy as np
 import pytest
 
 from viscm.gui import Colormap, viscm_editor
@@ -17,6 +18,7 @@ def approxeq(x, y, *, err=0.0001):
         "viscm/examples/sample_diverging_continuous.jscm",
     ],
 )
+@pytest.mark.xfail("Test very old; intent unclear")
 def test_editor_loads_native(colormap_file):
     with open(colormap_file) as f:
         data = json.loads(f.read())
@@ -60,7 +62,11 @@ def test_editor_loads_native(colormap_file):
 
     for i in range(len(colors)):
         for z in range(3):
-            assert approxeq(colors[i][z], editor_colors[i][z], err=0.01)
+            # FIXME: The right-hand side of this comparison will always be 0.
+            # https://github.com/matplotlib/viscm/pull/66#discussion_r1213818015
+            assert colors[i][z] == np.rint(editor_colors[i][z] / 256)
+            # Should the test look more like this?
+            # assert approxeq(colors[i][z], editor_colors[i][z], err=0.005)
 
 
 # import matplotlib as mpl