Steve Cotton 84b1a778ae Backstab unit tests: check that backstab works in a free-for-all
The units on the outsides of a backstab don't have to be allied
to each other, they just have to be enemies of the victim. That's
hardcoded into the AI via attack.cpp's backstab_check() function,
hence a unit test to check that WEAPON_SPECIAL_BACKSTAB activates
in that situation.

Add a new map with 4 sides all on separate castles. This is a
variation of the generic 2p unit test map, extended in the south
with a horizontal reflection of existing map.

Add a MAP_FILE argument to COMMON_KEEP_A_B_C_D_UNIT_TEST,
because it's the same setup except for the map file.
2024-01-26 14:35:07 +00:00
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