test: modify test-debugger-custom-port.js to use async-await

PR-URL: #44680 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Rich Trott <[email protected]>

Author: pshastricb

test/sequential/test-debugger-custom-port.js

@@ -9,22 +9,20 @@ const startCLI = require('../common/debugger');
 constassert=require('assert');
 
 // Custom port.
-{
-constscript=fixtures.path('debugger','three-lines.js');
+constscript=fixtures.path('debugger','three-lines.js');
 
-constcli=startCLI([`--port=${common.PORT}`,script]);
-
-cli.waitForInitialBreak()
-.then(()=>cli.waitForPrompt())
-.then(()=>{
-assert.match(cli.output,/debug>/,'prints a prompt');
-assert.match(
-cli.output,
-newRegExp(`< Debugger listening on [^\n]*${common.PORT}`),
-'forwards child output');
-})
-.then(()=>cli.quit())
-.then((code)=>{
-assert.strictEqual(code,0);
-});
-}
+constcli=startCLI([`--port=${common.PORT}`,script]);
+(asyncfunction(){
+try{
+awaitcli.waitForInitialBreak();
+awaitcli.waitForPrompt();
+assert.match(cli.output,/debug>/,'prints a prompt');
+assert.match(
+cli.output,
+newRegExp(`< Debugger listening on [^\n]*${common.PORT}`),
+'forwards child output');
+}finally{
+constcode=awaitcli.quit();
+assert.strictEqual(code,0);
+}
+})().then(common.mustCall());