Add room and track serilizer tests

spec/serializers/room_serializer_spec.rb

@@ -0,0 +1,17 @@
+require 'spec_helper'
+describe RoomSerializer, type: :serializer do
+  let(:room) { create(:room) }
+  let(:serializer) { RoomSerializer.new(room) }
+
+  it 'set guid, name and description' do
+    expected_json = {
+      room: {
+        guid: room.guid,
+        name: 'Example Room',
+        description: ''
+      }
+    }.to_json
+
+    expect(serializer.to_json).to eq expected_json
+  end
+end