add missing file for 46fb6dc

Author: SteffenDE

test/support/async_sync.ex

@@ -0,0 +1,27 @@
+defmodule Phoenix.LiveViewTest.Support.AsyncSync do
+  def wait_for_async_ready_and_monitor(name) do
+    receive do
+      :async_ready -> :ok
+    end
+
+    async_ref = Process.monitor(name)
+    send(name, :monitoring)
+
+    receive do
+      :monitoring_received -> :ok
+    end
+
+    async_ref
+  end
+
+  def register_and_sleep(notify_name, register_name) do
+    Process.register(self(), register_name)
+    send(notify_name, :async_ready)
+
+    receive do
+      :monitoring ->
+        send(notify_name, :monitoring_received)
+        Process.sleep(:infinity)
+    end
+  end
+end