CI: get more precise about when #1786 test case fails

diff --git a/ci/tests.py b/ci/tests.py
index 1d2d9df6da6298eca914055f843a744575a93caf..549c2d32878df984ac7dda48c79bfcdab92d6d2a 100644 (file)
--- a/ci/tests.py
+++ b/ci/tests.py
@@ -149,7 +149,9 @@ def check_that_tool_does_not_exist(tool, os_id):
   assert shutil.which(tool) is None, f"{tool} has been resurrected in the " \
     f'{os.getenv("build_system")} build on {os_id}. Please remove skip.'
 
-@pytest.mark.xfail(strict=is_cmake()) # FIXME
+@pytest.mark.xfail(is_cmake(),
+                   reason="png:gd unavailable when built with CMake",
+                   strict=True) # FIXME
 def test_1786():
   """
   png:gd format should be supported