Adds unit tests for bar sign datums (#68046)

code/modules/unit_tests/_unit_tests.dm

@@ -70,6 +70,7 @@
 #include "anchored_mobs.dm"
 #include "anonymous_themes.dm"
 #include "autowiki.dm"
+#include "barsigns.dm"
 #include "bespoke_id.dm"
 #include "binary_insert.dm"
 #include "bloody_footprints.dm"

code/modules/unit_tests/barsigns.dm

@@ -0,0 +1,37 @@
+/**
+ * Test if icon states for each datum actually exist in the DMI.
+ */
+/datum/unit_test/barsigns_icon
+
+/datum/unit_test/barsigns_icon/Run()
+	var/obj/structure/sign/barsign_type = /obj/structure/sign/barsign
+	var/icon/barsign_icon = initial(barsign_type.icon)
+	var/list/barsign_icon_states = icon_states(barsign_icon)
+
+	// Check every datum real bar sign
+	for(var/sign_type in (subtypesof(/datum/barsign) - /datum/barsign/hiddensigns))
+		var/datum/barsign/sign = new sign_type()
+
+		if(!(sign.icon in barsign_icon_states))
+			TEST_FAIL("Icon state for [sign_type] does not exist in [barsign_icon].")
+
+/**
+ * Check that bar signs have a name and desc, and that the name is unique.
+ */
+/datum/unit_test/barsigns_name
+
+/datum/unit_test/barsigns_name/Run()
+	var/list/existing_names = list()
+
+	for(var/sign_type in subtypesof(/datum/barsign) - /datum/barsign/hiddensigns)
+		var/datum/barsign/sign = new sign_type()
+
+		if(!sign.name)
+			TEST_FAIL("[sign_type] does not have a name.")
+		if(!sign.desc)
+			TEST_FAIL("[sign_type] does not have a desc.")
+
+		if(sign.name in existing_names)
+			TEST_FAIL("[sign_type] does not have a unique name.")
+
+		existing_names += sign.name