Synchronize handler timeout test startup

Author: dannote

test/vm/runtime/async_test.exs

@@ -114,10 +114,14 @@ defmodule QuickBEAM.VM.Runtime.AsyncTest do
       Process.sleep(:infinity)
     end
 
-    assert {:error, {:limit_exceeded, :timeout, 1_000}} =
-             QuickBEAM.VM.eval(program, handlers: %{"wait" => handler}, timeout: 1_000)
+    evaluation =
+      Task.async(fn ->
+        QuickBEAM.VM.eval(program, handlers: %{"wait" => handler}, timeout: 1_000)
+      end)
 
     assert_receive {:handler_started, handler_pid}, 1_000
+
+    assert {:error, {:limit_exceeded, :timeout, 1_000}} = Task.await(evaluation, 2_000)
     monitor = Process.monitor(handler_pid)
     assert_receive {:DOWN, ^monitor, :process, ^handler_pid, _reason}, 1_000
   end