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code/modules/unit_tests/subsystem_init.dm

@@ -0,0 +1,7 @@
+/datum/unit_test/subsystem_init/Run()
+	for(var/i in Master.subsystems)
+		var/datum/controller/subsystem/ss = i
+		if(ss.flags & SS_NO_INIT)
+			continue
+		if(!ss.initialized)
+			Fail("[ss]([ss.type]) is a subsystem meant to initialize but doesn't get set as initialized.")