Merge branch 'master' of https://github.com/Citadel-Station-13/Citadel-Station-13 into Ghommie-cit265

code/modules/unit_tests/_unit_tests.dm

@@ -3,6 +3,7 @@
 
 #ifdef UNIT_TESTS
 #include "anchored_mobs.dm"
+#include "component_tests.dm"
 #include "reagent_id_typos.dm"
 #include "reagent_recipe_collisions.dm"
 #include "spawn_humans.dm"

code/modules/unit_tests/component_tests.dm

@@ -0,0 +1,12 @@
+/datum/unit_test/component_duping/Run()
+	var/list/bad_dms = list()
+	var/list/bad_dts = list()
+	for(var/t in typesof(/datum/component))
+		var/datum/component/comp = t
+		if(!isnum(initial(comp.dupe_mode)))
+			bad_dms += t
+		var/dupe_type = initial(comp.dupe_type)
+		if(dupe_type && !ispath(dupe_type))
+			bad_dts += t
+	if(length(bad_dms) || length(bad_dts))
+		Fail("Components with invalid dupe modes: ([bad_dms.Join(",")]) ||| Components with invalid dupe types: ([bad_dts.Join(",")])")