test: better error message in trace events test

PR-URL: nodejs#20655
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-trace-events-async-hooks.js

@@ -3,6 +3,7 @@ const common = require('../common');
 const assert = require('assert');
 const cp = require('child_process');
 const fs = require('fs');
+const util = require('util');
 
 const CODE =
   'setTimeout(() => { for (var i = 0; i < 100000; i++) { "test" + i } }, 1)';
@@ -58,9 +59,9 @@ proc.once('exit', common.mustCall(() => {
     const initEvents = traces.filter((trace) => {
       return (trace.ph === 'b' && !trace.name.includes('_CALLBACK'));
     });
-    assert(initEvents.every((trace) => {
+    assert.ok(initEvents.every((trace) => {
       return (trace.args.executionAsyncId > 0 &&
               trace.args.triggerAsyncId > 0);
-    }));
+    }), `Unexpected initEvents format: ${util.inspect(initEvents)}`);
   }));
 }));