Adds unit tests for bar sign datums (#68046)

code/game/objects/structures/barsigns.dm

@@ -22,7 +22,7 @@
 
 	icon_state = sign.icon
 
-	if(sign.name)
+	if(sign.rename_area)
 		name = "[initial(name)] ([sign.name])"
 	else
 		name = "[initial(name)]"
@@ -30,7 +30,7 @@
 	if(sign.desc)
 		desc = sign.desc
 
-	if(sign.rename_area && sign.name)
+	if(sign.rename_area)
 		rename_area(src, sign.name)
 
 	return sign
@@ -138,15 +138,20 @@
 	var/list/names = list()
 	for(var/d in subtypesof(/datum/barsign))
 		var/datum/barsign/D = d
-		if(initial(D.name) && !initial(D.hidden))
+		if(!initial(D.hidden))
 			names += initial(D.name)
 	. = names
 
 /datum/barsign
-	var/name = "Name"
-	var/icon = "Icon"
-	var/desc = "desc"
+	/// User-visible name of the sign.
+	var/name
+	/// Icon state associated with this sign
+	var/icon
+	/// Description shown in the sign's examine text.
+	var/desc
+	/// Hidden from list of selectable options.
 	var/hidden = FALSE
+	/// Rename the area when this sign is selected.
 	var/rename_area = TRUE
 
 /datum/barsign/New()
@@ -304,7 +309,7 @@
 
 
 /datum/barsign/hiddensigns/empbarsign
-	name = null
+	name = "EMP'd"
 	icon = "empbarsign"
 	desc = "Something has gone very wrong."
 	rename_area = FALSE
@@ -315,7 +320,7 @@
 	desc = "Syndicate or die."
 
 /datum/barsign/hiddensigns/signoff
-	name = null
+	name = "Off"
 	icon = "empty"
 	desc = "This sign doesn't seem to be on."
 	rename_area = FALSE