Wait shutdown in test

test/utils.ts

@@ -5,6 +5,7 @@ const FormData = require('form-data');
 import * as childProcess from 'child_process';
 import * as http from 'http';
 import loadConfig from '../src/config/load';
+import { SIGKILL } from 'constants';
 
 export const port = loadConfig().port;
 
@@ -145,3 +146,19 @@ export function launchServer(callbackSpawnedProcess: (p: childProcess.ChildProce
 		});
 	};
 }
+
+export function shutdownServer(p: childProcess.ChildProcess, timeout = 20 * 1000) {
+	return new Promise((res, rej) => {
+		const t = setTimeout(() => {
+			p.kill(SIGKILL);
+			res('force exit');
+		}, timeout);
+
+		p.once('exit', () => {
+			clearTimeout(t);
+			res('exited');
+		});
+
+		p.kill();
+	});
+}