test: change test to not be sensitive to buffer send size

Change the test to not be sensitive to the buffer size causing
TCP resets to be received by the client causing the test to fail.
The test now reads the entire expected buffer and then checks for
the expected event to fire.

PR-URL: nodejs#31499
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-tls-close-event-after-write.js

@@ -12,30 +12,35 @@ const tls = require('tls');
 const fixtures = require('../common/fixtures');
 let cconn = null;
 let sconn = null;
+let read_len = 0;
+const buffer_size = 1024 * 1024;
 
 function test() {
   if (cconn && sconn) {
     cconn.resume();
     sconn.resume();
-    sconn.end(Buffer.alloc(1024 * 1024));
-    cconn.end();
+    sconn.end(Buffer.alloc(buffer_size));
   }
 }
 
 const server = tls.createServer({
   key: fixtures.readKey('agent1-key.pem'),
   cert: fixtures.readKey('agent1-cert.pem')
-}, function(c) {
-  c.on('close', function() {
-    server.close();
-  });
+}, (c) => {
+  c.on('close', common.mustCall(() => server.close()));
   sconn = c;
   test();
 }).listen(0, common.mustCall(function() {
   tls.connect(this.address().port, {
     rejectUnauthorized: false
   }, common.mustCall(function() {
     cconn = this;
+    cconn.on('data', (d) => {
+      read_len += d.length;
+      if (read_len === buffer_size) {
+        cconn.end();
+      }
+    });
     test();
   }));
 }));