quality: Add test cases for group_desc and group_features messages

test/lib/openflow/ofp_group_desc_stats_test.exs

@@ -0,0 +1,50 @@
+defmodule OfpGroupDescTest do
+  use ExUnit.Case
+
+  describe "Openflow.Multipart.GroupDesc.Request" do
+    test "with default values" do
+      desc = Openflow.Multipart.GroupDesc.Request.new(0)
+
+      desc
+      |> Openflow.to_binary()
+      |> Openflow.read()
+      |> Kernel.elem(1)
+      |> Kernel.==(desc)
+      |> assert()
+    end
+  end
+
+  describe "Openflow.Multipart.GroupDesc.Reply" do
+    test "with test packet_data" do
+      group_desc_stats =
+        "test/packet_data/4-34-ofp_group_desc_reply.packet"
+        |> File.read!()
+        |> Openflow.read()
+        |> Kernel.elem(1)
+
+      %Openflow.Multipart.GroupDesc.Reply{
+        aux_id: nil,
+        datapath_id: nil,
+        flags: [],
+        groups: [
+          %Openflow.Multipart.GroupDescStats{
+            buckets: [
+              %Openflow.Bucket{
+                actions: [
+                  %Openflow.Action.Output{max_len: :no_buffer, port_number: 2}
+                ],
+                watch_group: 1,
+                watch_port: 1,
+                weight: 1
+              }
+            ],
+            group_id: 1,
+            type: :all
+          }
+        ],
+        version: 4,
+        xid: 0
+      } = group_desc_stats
+    end
+  end
+end