test: use async/await in test-debugger-random-port-with-inspect-port

PR-URL: #44695
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/sequential/test-debugger-random-port-with-inspect-port.js

@@ -1,6 +1,5 @@
 'use strict';
 const common = require('../common');
-
 common.skipIfInspectorDisabled();
 
 const fixtures = require('../common/fixtures');
@@ -9,22 +8,18 @@ const startCLI = require('../common/debugger');
 const assert = require('assert');
 
 // Random port with --inspect-port=0.
-{
-  const script = fixtures.path('debugger', 'three-lines.js');
+const script = fixtures.path('debugger', 'three-lines.js');
 
-  const cli = startCLI(['--inspect-port=0', script]);
+const cli = startCLI(['--inspect-port=0', script]);
 
-  cli.waitForInitialBreak()
-    .then(() => cli.waitForPrompt())
-    .then(() => {
-      assert.match(cli.output, /debug>/, 'prints a prompt');
-      assert.match(
-        cli.output,
-        /< Debugger listening on /,
-        'forwards child output');
-    })
-    .then(() => cli.quit())
-    .then((code) => {
-      assert.strictEqual(code, 0);
-    });
-}
+(async () => {
+  await cli.waitForInitialBreak();
+  await cli.waitForPrompt();
+  assert.match(cli.output, /debug>/, 'prints a prompt');
+  assert.match(
+    cli.output,
+    /< Debugger listening on /,
+    'forwards child output');
+  const code = await cli.quit();
+  assert.strictEqual(code, 0);
+})().then(common.mustCall());