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test against color values rather than encoded string #1200

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Merged
TonioF merged 1 commit into from
Feb 10, 2026
+33 −29
Merged

test against color values rather than encoded string #1200

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62 changes: 33 additions & 29 deletions test/util/test_cmaps.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,14 @@
# Permissions are hereby granted under the terms of the MIT License:
# https://opensource.org/licenses/MIT.

import json
import os
from unittest import TestCase
import numpy.testing as nt

import base64
from io import BytesIO
import matplotlib.colors
from PIL import Image
import numpy as np

from xcube.util.cmaps import (
Expand Down Expand Up @@ -207,14 +210,15 @@ def test_colormaps(self):
colormap = self.registry.colormaps.get("viridis")
self.assertEqual("Perceptually Uniform Sequential", colormap.cat_name)
self.assertEqual("viridis", colormap.cm_name)
self.assertEqual(
"iVBORw0KGgoAAAANSUhEUgAAAQAAAAABCAYAAAAxWXB3AAAAwUlEQVR4nI1T2w3DIAy8M6"
"t1hO4/SonwAxsSoqqK7u2fpPzw20ECFFAMIQSHJwLNRFxnHpvZrf3ZzadvuuZdNV40tK/"
"+4OF5L/zE6Ncu1o7e3zYTc3PHp37i2+bf/s3DOU/ezznu3dMNLF7R2POVs3ic6BnC809tw"
"Y3rqwu/+2cyMHR2qqcPNu2e8Pfgmd+O2jYNuQ3eRoYNx9Z3iXnDunbffOul77vK/Ua9a9"
"xR98GB5n+bppzOCSENIe6PH9EouACsDYkJOqoM1AAAAABJRU5ErkJggg==",
colormap.cmap_png_base64,
)

cmap_base64 = colormap.cmap_png_base64
image_bytes = base64.b64decode(cmap_base64)
image = Image.open(BytesIO(image_bytes))
cmap = np.asarray(image)
self.assertEqual((1, 256, 4), cmap.shape)
nt.assert_array_equal(cmap[0][0], np.array([68, 1, 84, 255]))
nt.assert_array_equal(cmap[0][128], np.array([32, 144, 140, 255]))
nt.assert_array_equal(cmap[0][-1], np.array([253, 231, 36, 255]))

def test_to_json(self):
obj = self.registry.to_json()
Expand Down Expand Up @@ -245,15 +249,15 @@ def test_colormaps_ocean(self):
self.assertIsInstance(colormap, Colormap)
self.assertEqual("Ocean", colormap.cat_name)
self.assertEqual("thermal", colormap.cm_name)
self.assertEqual(
"iVBORw0KGgoAAAANSUhEUgAAAQAAAAABCAYAAAAxWXB3AAAAzklEQVR4nH1SWx"
"IDIQhL8Cg9Qu9/taUjD0Vp++GEPGClluP1VkIA5iEAAZMXjxhL40LXuLRhOLOuXYgBKZ"
"lZC85aWn1VGtM5md0iDiBEQ9uIapwTzVNb1X3XeGW4MoHBaz5nu16zf3zzyryWL9/I+1"
"w9bX7ruzFzZceGZU/rq/OT17n6FfesW3uaVvXF+Rw+efqdKzBRnl0b3zXEd/OcFsRZL/"
"TfJP5glnFMHvhT80fSfJjlE1p84yuza92PFnX0WSayX3TTroydvE/JzewHgrd1PCuMz"
"AkAAAAASUVORK5CYII=",
colormap.cmap_png_base64,
)

cmap_base64 = colormap.cmap_png_base64
image_bytes = base64.b64decode(cmap_base64)
image = Image.open(BytesIO(image_bytes))
cmap = np.asarray(image)
self.assertEqual((1, 256, 4), cmap.shape)
nt.assert_array_equal(cmap[0][0], np.array([3, 35, 51, 255]))
nt.assert_array_equal(cmap[0][128], np.array([176, 95, 129, 255]))
nt.assert_array_equal(cmap[0][-1], np.array([231, 250, 90, 255]))

def test_load_snap_cpd_colormap(self):
cmap_name = os.path.join(os.path.dirname(__file__), "chl_DeM2_200.cpd")
Expand Down Expand Up @@ -330,17 +334,17 @@ def test_cmap_reversed_alpha(self):
self.assertEqual("coolwarm_r_alpha", cmap.name)

def test_cmap_png_base64(self):
base64 = self.colormap.cmap_png_base64
self.assertIsInstance(base64, str)
self.assertIs(base64, self.colormap.cmap_png_base64)
self.assertEqual(
"iVBORw0KGgoAAAANSUhEUgAAAQAAAAABCAYAAAAxWXB3AAAAwklEQVR4nJWNwRHDMAgED"
"5WVGlJ0+krMZYRAAkt55OHh2FtkeTxfFBFIa2htzNjF95b3oytoKdt+uzF/6+N9HL2Vs"
"fzuFB/pbnDr851gelu2m+VVhspuuTLeeu4ZmbuPtHvuznSN7fu8y/shW2+f7n1weqb+mC"
"MjGKuD6O0dLay7SLO4NiszV8NdDM7Mm33tqDvbOlXQJ8jBp1P7OdU997MX98Ht8/8ulr"
"o/sl6Vj93ZRWj4l47O+8javTehH57nm/gCD19T7PVeadMAAAAASUVORK5CYII=",
base64,
)
cmap_base64 = self.colormap.cmap_png_base64
self.assertIsInstance(cmap_base64, str)
self.assertIs(cmap_base64, self.colormap.cmap_png_base64)

image_bytes = base64.b64decode(cmap_base64)
image = Image.open(BytesIO(image_bytes))
cmap = np.asarray(image)
self.assertEqual((1, 256, 4), cmap.shape)
nt.assert_array_equal(cmap[0][0], np.array([58, 76, 192, 255]))
nt.assert_array_equal(cmap[0][128], np.array([221, 220, 219, 255]))
nt.assert_array_equal(cmap[0][-1], np.array([179, 3, 38, 255]))


class ColormapParseTest(TestCase):
Expand Down