diff --git a/test/websockex_test.exs b/test/websockex_test.exs
index 813a4bc..6548d46 100644
--- a/test/websockex_test.exs
+++ b/test/websockex_test.exs
@@ -605,11 +605,16 @@ defmodule WebSockexTest do
       # Really glad that I got those sys behaviors now
       :sys.suspend(pid)
 
+      test_pid = self()
+
       task =
         Task.async(fn ->
+          send(test_pid, :task_started)
           WebSockex.send_frame(pid, {:text, "hello"})
         end)
 
+      assert_receive :task_started
+
       :gen_tcp.shutdown(conn.socket, :write)
 
       :sys.resume(pid)