Improve partitioner unit tests#254

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mike-hobson wants to merge 4 commits intoMetOffice:mainfrom

mike-hobson:add_uneven_partition_test

Commits on Jan 23, 2026

Add a unit test for partitioning that leads to unevenly sized partitions.
mike-hobson
committed

Commits on Jan 26, 2026

Add further partitioning unit tests.
mike-hobson
committed

Commits on Jan 28, 2026