Update test_io.py

Author: mhallipelto

tests/test_io.py

@@ -136,7 +136,7 @@ def test_reading_empty():
     assert isinstance(holes, Holes)
 
 
-@pytest.mark.skipif(not ping_gtk(), reason="GTK DB not available")
+@pytest.mark.skipif(ping_gtk(), reason="GTK DB not available")
 def test_gtk_wfs():
     bbox = (60.2, 24.8, 60.215, 24.83)
     holes = from_gtk_wfs(bbox, "EPSG:4326", progress_bar=True)