Extend close/1 test

Author: mickel8

test/ex_webrtc/peer_connection_test.exs

@@ -534,5 +534,11 @@ defmodule ExWebRTC.PeerConnectionTest do
     assert :ok == PeerConnection.close(pc)
     assert false == Process.alive?(pc)
     Enum.each(links, fn link -> assert false == Process.alive?(link) end)
+
+    {:ok, pc} = PeerConnection.start()
+    {:links, links} = Process.info(pc, :links)
+    assert true == Process.exit(pc, :shutdown)
+    assert false == Process.alive?(pc)
+    Enum.each(links, fn link -> assert false == Process.alive?(link) end)
   end
 end