buffer blocks while no changes underlying, test buffer

src/device/input/input.go

@@ -12,5 +12,9 @@ func New() Input {
 	if p, ok := os.LookupEnv("INPUT_RANDOM_WEIGHT_FILE"); ok {
 		foo = randomCharFromWeightFile(p)
 	}
-	return NewRandom(foo)
+	var result Input = NewRandom(foo)
+	if os.Getenv("INPUT_BUFFERED") == "true" {
+		result = NewBuffered(result)
+	}
+	return result
 }