Covers all three covering operators with success and error-path tests
using the Prophecy mocking framework. The key assertion verifies that
get_space_polygon_from_context_visible_objects' return value is unpacked
so the polygon (not the tuple of polygon+bounding_elements) reaches
set_covering_representation_from_polygon.
Shapely geometry objects are not JSON-serialisable (Prophecy call
serialisation), so we use the plain integer 42 as a stand-in for the
polygon value.
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CyrilWaechter