Some data for testing:

Examples සංස්කරණය

Data from Netherton Tunnel Branch Canal article:

No coords සංස්කරණය

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

Various maplink examples සංස්කරණය

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

{{GeoGroup}}

Map all coordinates using: OpenStreetMap 
Download coordinates as: KML

{{GeoGroup/sandbox}}

Map all coordinates 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)

{{GeoGroup}}

Map all coordinates using: OpenStreetMap 
Download coordinates as: KML

{{GeoGroup/sandbox}}

Map all coordinates using: OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

Display all the coordinates in a different article:

{{GeoGroup}}

Map all coordinates using: OpenStreetMap 
Download coordinates as: KML

{{GeoGroup/sandbox}}

Map all coordinates using: OpenStreetMap 
Download coordinates as:
KML
GPX (primary)
GPX (secondary)
GPX (all)

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

{{GeoGroup}}

Map all coordinates using: OpenStreetMap 
Download coordinates as: KML

{{GeoGroup/sandbox}}

Map all coordinates 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)

{{GeoGroup}}

Map all coordinates using: OpenStreetMap 
Download coordinates as: KML

{{GeoGroup/sandbox}}

Map all coordinates 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