restore test_icon sanity check fixture

Author: GeigerJ2

tests/integration/test_icon_sanity.py

@@ -0,0 +1,23 @@
+"""Sanity checks for ICON availability.
+
+This test verifies that the ICON environment is properly set up before running
+more expensive integration tests. Useful for HPC runners where ICON needs to be
+available.
+"""
+
+import pytest
+
+
+@pytest.mark.requires_icon
+@pytest.mark.usefixtures("icon_filepath_executable", "icon_grid_path")
+def test_icon():
+    """Verify ICON executable and test data are available.
+
+    This test checks:
+    - ICON executable can be found (via icon_filepath_executable fixture)
+    - ICON grid test data can be downloaded (via icon_grid_path fixture)
+
+    The actual checks happen in the fixtures - if either fails, this test will fail.
+    """
+    # Test is performed by fixtures
+    pass