cleanup + add tests

lib/farmbot/lib/helpers.ex

@@ -23,7 +23,4 @@ defmodule Farmbot.Lib.Helpers do
     end
   end
 
-  def rollbar_occurrence_data do
-    Application.get_env(:farmbot, :rollbar_occurrence_data, %{})
-  end
 end

test/farmbot/lib/helpers_test.exs

@@ -0,0 +1,34 @@
+defmodule Farmbot.Lib.HelpersTest do
+  @moduledoc "Tests helper functions."
+
+  use ExUnit.Case
+
+  test "tests uuid function" do
+    refute Farmbot.Lib.Helpers.uuid?("123,123,123")
+    assert Farmbot.Lib.Helpers.uuid?(UUID.uuid1)
+  end
+end
+
+
+
+defmodule F do
+  use Supervisor
+
+  def start_link do
+    Supervisor.start_link(__MODULE__, [], [])
+  end
+
+  def init([]) do
+    children = [
+      worker(SystemRegistry.Monitor, [
+        [:state, :network_interface,  "wlan0", :ipv4_address], {__MODULE__, :netchange, [:old, :new]}
+      ])
+    ]
+
+    supervise(children, [strategy: :one_for_one])
+  end
+
+  def netchange(_old, _new) do
+     # Do something when the key changes
+  end
+end