Use async tests

Author: mtrudel

test/thousand_island/handler_test.exs

@@ -1,6 +1,5 @@
 defmodule ThousandIsland.HandlerTest do
-  # False due to telemetry raciness
-  use ExUnit.Case, async: false
+  use ExUnit.Case, async: true
 
   use Machete
 

test/thousand_island/listener_test.exs

@@ -1,5 +1,5 @@
 defmodule ThousandIsland.ListenerTest do
-  use ExUnit.Case, async: false
+  use ExUnit.Case, async: true
   use Machete
 
   alias ThousandIsland.{Listener, ServerConfig}

test/thousand_island/server_test.exs

@@ -1,6 +1,5 @@
 defmodule ThousandIsland.ServerTest do
-  # False due to telemetry raciness
-  use ExUnit.Case, async: false
+  use ExUnit.Case, async: true
 
   use Machete
 

test/thousand_island/socket_test.exs

@@ -1,6 +1,5 @@
 defmodule ThousandIsland.SocketTest do
-  # False due to telemetry raciness
-  use ExUnit.Case, async: false
+  use ExUnit.Case, async: true
 
   use Machete