quality: Add test cases for desc stats message

test/lib/openflow/ofp_desc_stats_test.exs

@@ -0,0 +1,41 @@
+defmodule OfpDescTest do
+  use ExUnit.Case
+
+  describe "Openflow.Multipart.Desc.Request" do
+    test "with default values" do
+      desc = Openflow.Multipart.Desc.Request.new(0)
+
+      desc
+      |> Openflow.to_binary()
+      |> Openflow.read()
+      |> Kernel.elem(1)
+      |> Kernel.==(desc)
+      |> assert()
+    end
+  end
+
+  describe "Openflow.Multipart.Desc.Reply" do
+    test "with default values" do
+      desc =
+        %Openflow.Multipart.Desc.Reply{
+          dp_desc: "None",
+          hw_desc: "Open vSwitch",
+          mfr_desc: "Nicira, Inc.",
+          serial_num: "None",
+          sw_desc: "2.11.0"
+        }
+        |> Map.to_list()
+        |> Openflow.Multipart.Desc.Reply.new()
+        |> Openflow.to_binary()
+        |> Openflow.read()
+        |> Kernel.elem(1)
+
+      assert desc.xid == 0
+      assert desc.mfr_desc == "Nicira, Inc."
+      assert desc.dp_desc == "None"
+      assert desc.hw_desc == "Open vSwitch"
+      assert desc.sw_desc == "2.11.0"
+      assert desc.serial_num == "None"
+    end
+  end
+end