test: use async/await in test-debugger-help

PR-URL: https://github.com/nodejs/node/pull/44686
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/sequential/test-debugger-help.js

@@ -1,27 +0,0 @@
-'use strict';
-const common = require('../common');
-
-common.skipIfInspectorDisabled();
-
-const fixtures = require('../common/fixtures');
-const startCLI = require('../common/debugger');
-
-const assert = require('assert');
-
-{
-  const cli = startCLI([fixtures.path('debugger/empty.js')]);
-
-  function onFatal(error) {
-    cli.quit();
-    throw error;
-  }
-
-  return cli.waitForInitialBreak()
-    .then(() => cli.waitForPrompt())
-    .then(() => cli.command('help'))
-    .then(() => {
-      assert.match(cli.output, /run, restart, r\s+/m);
-    })
-    .then(() => cli.quit())
-    .then(null, onFatal);
-}

test/sequential/test-debugger-help.mjs

@@ -0,0 +1,19 @@
+import { skipIfInspectorDisabled } from '../common/index.mjs';
+
+skipIfInspectorDisabled();
+
+import { path } from '../common/fixtures.mjs';
+import startCLI from '../common/debugger.js';
+
+import assert from 'assert';
+
+const cli = startCLI([path('debugger', 'empty.js')]);
+
+try {
+  await cli.waitForInitialBreak();
+  await cli.waitForPrompt();
+  await cli.command('help');
+  assert.match(cli.output, /run, restart, r\s+/m);
+} finally {
+  cli.quit();
+}