test: change promise to async/await in debugger-watcher

PR-URL: #44687
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: Pooja444

test/sequential/test-debugger-watchers.js

@@ -0,0 +1,49 @@
+import{skipIfInspectorDisabled}from'../common/index.mjs';
+skipIfInspectorDisabled();
+
+import{path}from'../common/fixtures.mjs';
+importstartCLIfrom'../common/debugger.js';
+
+importassertfrom'assert';
+
+constscript=path('debugger','break.js');
+constcli=startCLI([script]);
+
+functiononFatal(error){
+cli.quit();
+throwerror;
+}
+
+// Stepping through breakpoints.
+try{
+awaitcli.waitForInitialBreak();
+awaitcli.waitForPrompt();
+awaitcli.command('watch("x")');
+awaitcli.command('watch("\\"Hello\\"")');
+awaitcli.command('watch("42")');
+awaitcli.command('watch("NaN")');
+awaitcli.command('watch("true")');
+awaitcli.command('watch("[1, 2]")');
+awaitcli.command('watch("process.env")');
+awaitcli.command('watchers');
+
+assert.match(cli.output,/xisnotdefined/);
+
+awaitcli.command('unwatch("42")');
+awaitcli.stepCommand('n');
+
+assert.match(cli.output,/0:x=10/);
+assert.match(cli.output,/1:"Hello"='Hello'/);
+assert.match(cli.output,/2:NaN=NaN/);
+assert.match(cli.output,/3:true=true/);
+assert.match(cli.output,/4:\[1,2\]=\[1,2\]/);
+assert.match(
+cli.output,
+/5:process\.env=\n\s+\{[\s\S]+,\n\s+\.\.\.\}/,
+'shows "..." for process.env'
+);
+
+awaitcli.quit();
+}catch(error){
+onFatal(error);
+}