quality: Add test case for nx_set_packet_in_format message

test/lib/openflow/ofp_set_packet_in_format_test.exs

@@ -0,0 +1,23 @@
+defmodule OfpSetPacketInFormatTest do
+  use ExUnit.Case
+  doctest Openflow
+
+  describe "Openflow.to_binary/1" do
+    test "with Openflow.SetPacket_In_Format.new/1" do
+      packet_in_format =
+        "test/packet_data/nx_set_packet_in_format.raw"
+        |> File.read!()
+        |> Openflow.read()
+        |> Kernel.elem(1)
+
+      packet_in_format
+      |> Openflow.to_binary()
+      |> Openflow.read()
+      |> Kernel.elem(1)
+      |> Map.to_list()
+      |> Openflow.NxSetPacketInFormat.new()
+      |> Kernel.==(packet_in_format)
+      |> assert()
+    end
+  end
+end