These are based on actual displays/devices.
A display-size-calculator ( https://www.sven.de/dpi/ ) was used to
calculate the width and height from resolution and diagonal display-size.
Some of these tests check for non-optimal results;
however, their purpose is mostly to make it noticeable
how changes to scaling-behaviour affect various
display-types.
When Squeekboard's scaling-behaviour will be improved, the tests
should be updated with values that fit the displays/devices better.
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/640>
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