ランダムにテストがコケるのを修正 (#7553)

* Test shutdown

* Revert "Test shutdown"

This reverts commit 85182e7dd1.

* Skip beforeShutdown in test

* Wait shutdown in test

* Revert "Skip beforeShutdown in test"

This reverts commit 79c33ab536.

* Revert "Revert "Skip beforeShutdown in test""

This reverts commit 3423133a13.

src/misc/before-shutdown.ts

@@ -56,6 +56,8 @@ const forceExitAfter = timeout => () => {
  * @param {string} signalOrEvent The exit signal or event name received on the process.
  */
 async function shutdownHandler(signalOrEvent) {
+	if (process.env.NODE_ENV === 'test') return process.exit(0);
+
 	console.warn(`Shutting down: received [${signalOrEvent}] signal`);
 
 	for (const listener of shutdownListeners) {