node/test/parallel/test-tls-max-send-fragment.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
if (!common.hasCrypto)
  common.skip('missing crypto');

const assert = require('assert');
const tls = require('tls');
const fs = require('fs');

const buf = Buffer.allocUnsafe(10000);
let received = 0;
const maxChunk = 768;

const server = tls.createServer({
  key: fs.readFileSync(`${common.fixturesDir}/keys/agent1-key.pem`),
  cert: fs.readFileSync(`${common.fixturesDir}/keys/agent1-cert.pem`)
}, function(c) {
  // Lower and upper limits
  assert(!c.setMaxSendFragment(511));
  assert(!c.setMaxSendFragment(16385));

  // Correct fragment size
  assert(c.setMaxSendFragment(maxChunk));

  c.end(buf);
}).listen(0, common.mustCall(function() {
  const c = tls.connect(this.address().port, {
    rejectUnauthorized: false
  }, common.mustCall(function() {
    c.on('data', function(chunk) {
      assert(chunk.length <= maxChunk);
      received += chunk.length;
    });

    // Ensure that we receive 'end' event anyway
    c.on('end', common.mustCall(function() {
      c.destroy();
      server.close();
      assert.strictEqual(received, buf.length);
    }));
  }));
}));