Some data for testing:

Data from Netherton Tunnel Branch Canal article:

This section has no coordinates. Attempting to use in GeoGroup's |section= parameter should result in an error

සංස්කරණය

Display the coordinates from a different section than this one (in current article):

Side by side comparison
{{GeoGroup}}{{GeoGroup/sandbox}}
<maplink>: Title "#Examples" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as: KML
<maplink>: Title "#Examples" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

Display the coordinates from a different section than this one (in current article), when that section has no coordinates:
(error expected)

Side by side comparison
{{GeoGroup}}{{GeoGroup/sandbox}}
<maplink>: Title "#No coords" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as: KML
<maplink>: Title "#No coords" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

Display all the coordinates in a different article:

Side by side comparison
{{GeoGroup}}{{GeoGroup/sandbox}}
<maplink>: Title "List of United States cities by population" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as: KML
<maplink>: Title "List of United States cities by population" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

Display just the coordinates in one section of a different article:

Side by side comparison
{{GeoGroup}}{{GeoGroup/sandbox}}
<maplink>: Title "List of United States cities by population#Puerto Rico" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as: KML
<maplink>: Title "List of United States cities by population#Puerto Rico" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

Display all coordinates in a category:
(expect |maplink= to be ignored for categories)

Side by side comparison
{{GeoGroup}}{{GeoGroup/sandbox}}
<maplink>: Title "Category:Rail transport stations in London fare zone 2" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as: KML
<maplink>: Title "Category:Rail transport stations in London fare zone 2" is not a valid map data page
, or show using:
OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)
"https://si.wikipedia.org/w/index.php?title=සැකිල්ල:GeoGroup/testcases3&oldid=543199" වෙතින් සම්ප්‍රවේශනය කෙරිණි