apply gha image tolerance deltas

tests/plotting/test_examples.py

@@ -1,5 +1,6 @@
 """Unit-tests for :mod:`geovista.examples`."""
 import importlib
+import os
 import pkgutil
 
 import pytest
@@ -8,6 +9,9 @@
 import geovista as gv
 import geovista.examples
 
+# determine whether running on GHA runner
+CI: bool = os.environ.get("CI", "false").lower() == "true"
+
 # construct list of example script names
 SCRIPTS = sorted(
     [submodule.name for submodule in pkgutil.iter_modules(gv.examples.__path__)]
@@ -17,11 +21,22 @@
 pv.OFF_SCREEN = True
 gv.GEOVISTA_IMAGE_TESTING = True
 
+# individual test case exceptions to the default image tolerances
+thresholds = {
+    "from_points__orca_cloud": {"warning_value": 202.0},
+    "from_points__orca_cloud_eqc": {"warning_value": 250.0},
+}
+
 
 @pytest.mark.image
 @pytest.mark.parametrize("script", SCRIPTS)
 def test(script, verify_image_cache):
     """Image test the example scripts."""
+    # apply individual test case image tolerance exceptions only when
+    # executing within a remote GHA runner environment
+    if CI and script in thresholds:
+        for attr, value in thresholds[script].items():
+            setattr(verify_image_cache, attr, value)
     verify_image_cache.test_name = f"test_{script}"
     module = importlib.import_module(f"geovista.examples.{script}")
     module.main()