Fix flaky test-release test

ts/scripts/test-electron.ts

@@ -0,0 +1,55 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+/* eslint-disable no-console */
+
+import { execFileSync } from 'child_process';
+import { join } from 'path';
+
+const ROOT_DIR = join(__dirname, '..', '..');
+
+const ELECTRON = join(
+  ROOT_DIR,
+  'node_modules',
+  '.bin',
+  process.platform === 'win32' ? 'electron.cmd' : 'electron'
+);
+
+const stdout = execFileSync(ELECTRON, [ROOT_DIR], {
+  cwd: ROOT_DIR,
+  env: {
+    ...process.env,
+    NODE_ENV: 'test',
+    TEST_QUIT_ON_COMPLETE: 'on',
+  },
+  encoding: 'utf8',
+});
+
+const match = stdout.match(/ci:test-electron:done=(.*)?\n/);
+
+if (!match) {
+  throw new Error('No test results were found in stdout');
+}
+
+const {
+  passed,
+  failed,
+}: {
+  passed: Array<string>;
+  failed: Array<{ testName: string; error: string }>;
+} = JSON.parse(match[1]);
+
+const total = passed.length + failed.length;
+
+for (const { testName, error } of failed) {
+  console.error(`- ${testName}`);
+  console.error(error);
+  console.error('');
+}
+
+console.log(
+  `Passed ${passed.length} | Failed ${failed.length} | Total ${total}`
+);
+
+if (failed.length !== 0) {
+  process.exit(1);
+}