defmodule Aprsme.SignalHandlerTest do
  use ExUnit.Case, async: true

  alias Aprsme.SignalHandler

  describe "handle_info/2" do
    test "ignores unrecognized messages without changing state" do
      state = %{some: :state}
      assert SignalHandler.handle_info(:random, state) == {:noreply, state}
      assert SignalHandler.handle_info({:other, "msg"}, state) == {:noreply, state}
    end

    # We can't safely exercise the :sigterm clause here — it calls
    # Aprsme.ShutdownHandler.shutdown() which would actually shut the app down.
  end

  describe "init/1" do
    test "installs a SIGTERM handler and returns an empty state" do
      # :os.set_signal is process-global but calling it a second time with
      # :handle is idempotent at the VM level. Safe to exercise.
      assert {:ok, %{}} = SignalHandler.init([])
    end
  end
end