del VBOs with questionable sourcing (#18924)

* del VBOs with questionable sourcing

* .

* unit test the usages

* move

* remove these as well

* remove from lists

* daian....

---------

Co-authored-by: C.L. <killer65311@gmail.com>

code/modules/unit_tests/_unit_tests.dm

@@ -105,6 +105,7 @@
 #include "map_tests.dm"
 #include "mapping.dm"
 #include "material_tests.dm"
+#include "mob_vbo_test.dm"
 // #include "nuke_cinematic.dm" // TODO: This is probably fixed later on
 #include "poster_tests.dm"
 // #include "preferences.dm" // This unit test is missing some other stuff

code/modules/unit_tests/mob_vbo_test.dm

@@ -0,0 +1,18 @@
+/// Tests that all mobs with assigned bellies use valid datums
+/datum/unit_test/mobs_use_valid_belly_overlays
+
+/datum/unit_test/mobs_use_valid_belly_overlays/Run()
+	for(var/mob/living/simple_mob/test_path as anything in typesof(/mob/living/simple_mob))
+		if(!initial(test_path.vore_active))
+			continue
+		var/mob/living/simple_mob/test_mob = new test_path()
+		test_mob.init_vore(TRUE)
+		for(var/obj/belly/mob_belly in test_mob.vore_organs)
+			var/test_fullscreen = mob_belly.belly_fullscreen
+			if(!length(test_fullscreen))
+				continue
+			var/datum/belly_overlays/test_overlay = text2path("/datum/belly_overlays/[lowertext(test_fullscreen)]")
+			if(test_overlay)
+				continue
+			TEST_FAIL("[test_mob] uses a non existing belly_fullscreen [test_fullscreen].")
+		qdel(test_mob)