unit tests (#17749)

code/modules/unit_tests/_unit_tests.dm

@@ -7,6 +7,7 @@
 #include "crafting_lists.dm"
 #include "log_format.dm"
 #include "map_templates.dm"
+#include "purchase_reference_test.dm"
 #include "reagent_id_typos.dm"
 #include "rustg_version.dm"
 #include "spawn_humans.dm"

code/modules/unit_tests/purchase_reference_test.dm

@@ -0,0 +1,28 @@
+// tests if there are duplicate or null refs/lognames for uplink items and spellbook items respectively
+/datum/unit_test/uplink_refs/Run()
+	var/list/uplink_refs = list()
+	for(var/datum/uplink_item/I as anything in subtypesof(/datum/uplink_item))
+		if(isnull(initial(I.item)))
+			continue //don't test them if they don't have an item
+		var/uplink_ref = initial(I.reference)
+		if(isnull(uplink_ref))
+			Fail("uplink item [initial(I.name)] has no reference")
+			continue
+		if(uplink_ref in uplink_refs)
+			Fail("uplink reference [uplink_ref] is used multiple times")
+		uplink_refs += uplink_ref
+
+/datum/unit_test/spellbook_refs/Run()
+	var/list/spell_refs = list()
+	var/list/blacklist = list(/datum/spellbook_entry/summon,
+								/datum/spellbook_entry/item,
+								/datum/spellbook_entry/loadout,)
+	for(var/datum/spellbook_entry/entry as anything in subtypesof(/datum/spellbook_entry) - blacklist)
+		var/spell_ref = initial(entry.log_name)
+		if(isnull(spell_ref))
+			Fail("spellbook entry [initial(entry.name)] has no reference")
+			continue
+		if(spell_ref in spell_refs)
+			Fail("spellbook reference [spell_ref] is used multiple times")
+		spell_refs += spell_ref
+