Add a test to prevent accidental removal of placeholders in urls
Add a test to prevent accidental removal of placeholders in urls

tomhughes/leaflet-providers,kyroskoh/leaflet-providers,leaflet-extras/leaflet-providers,kyroskoh/leaflet-providers,ximex/leaflet-providers,leaflet-extras/leaflet-providers,tomhughes/leaflet-providers,ximex/leaflet-providers