openflow: Fix aggregate request

test/lib/openflow/ofp_hello_test.exs

@@ -0,0 +1,29 @@
+defmodule OfpHelloTest do
+  use ExUnit.Case
+  doctest Openflow
+
+  describe "Openflow.read/1" do
+    test "with OFP_HELLO packet" do
+      {:ok, hello, ""} =
+        "test/packet_data/ofp_hello.raw"
+        |> File.read!()
+        |> Openflow.read()
+
+      assert hello.version == 4
+      assert hello.xid == 0
+      assert hello.elements == [versionbitmap: [30, 10, 9, 3, 2, 1]]
+    end
+  end
+
+  describe "Openflow.to_binary/1" do
+    test "with %Openflow.Hello{}" do
+      hello = Openflow.Hello.new([30, 10, 9, 3, 2, 1])
+
+      expect =
+        "test/packet_data/ofp_hello.raw"
+        |> File.read!()
+
+      assert Openflow.to_binary(hello) == expect
+    end
+  end
+end