'use strict'; const common = require('../common'); if (!common.hasCrypto) common.skip('missing crypto'); const tls = require('tls'); const net = require('net'); const assert = require('assert'); const bonkers = Buffer.alloc(1024, 42); const server = tls.createServer({}) .listen(0, function() { const c = net.connect({ port: this.address().port }, function() { c.write(bonkers); }); }).on('tlsClientError', common.mustCall(function(e) { assert.ok(e instanceof Error, 'Instance of Error should be passed to error handler'); assert.ok( /SSL routines:[^:]*:wrong version number/.test( e.message), 'Expecting SSL unknown protocol'); server.close(); }));