test: simplify test-vm-memleak

PR-URL: nodejs#34881
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

test/pummel/test-vm-memleak.js

@@ -27,7 +27,6 @@ const assert = require('assert');
 const vm = require('vm');
 
 const start = Date.now();
-let maxMem = 0;
 
 const interval = setInterval(function() {
   try {
@@ -36,22 +35,20 @@ const interval = setInterval(function() {
   }
 
   const rss = process.memoryUsage().rss;
-  maxMem = Math.max(rss, maxMem);
+  assert.ok(rss < 64 * 1024 * 1024,
+            `memory usage: ${Math.round(rss / (1024 * 1024))}Mb`);
 
+  // Stop after 5 seconds.
   if (Date.now() - start > 5 * 1000) {
-    // wait 10 seconds.
     clearInterval(interval);
 
     testContextLeak();
   }
 }, 1);
 
 function testContextLeak() {
+  // TODO: This needs a comment explaining what it's doing. Will it crash the
+  // test if there is a memory leak? Or what?
   for (let i = 0; i < 1000; i++)
     vm.createContext({});
 }
-
-process.on('exit', function() {
-  console.error(`max mem: ${Math.round(maxMem / (1024 * 1024))}mb`);
-  assert.ok(maxMem < 64 * 1024 * 1024);
-});