test: make tls test more rigorous

* exit naturally, don't use process.exit()
* ensure callbacks are actually called

PR-URL: #18792
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-tls-connect-no-host.js

@@ -6,7 +6,6 @@ if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const tls = require('tls');
-
 const assert = require('assert');
 
 const cert = fixtures.readSync('test_cert.pem');
@@ -15,19 +14,20 @@ const key = fixtures.readSync('test_key.pem');
 // https://github.com/nodejs/node/issues/1489
 // tls.connect(options) with no options.host should accept a cert with
 //   CN:'localhost'
-tls.createServer({
+const server = tls.createServer({
   key,
   cert
-}).listen(0, function() {
+}).listen(0, common.mustCall(function() {
   const socket = tls.connect({
     port: this.address().port,
     ca: cert,
     // No host set here. 'localhost' is the default,
     // but tls.checkServerIdentity() breaks before the fix with:
     // Error: Hostname/IP doesn't match certificate's altnames:
     //   "Host: undefined. is not cert's CN: localhost"
-  }, function() {
+  }, common.mustCall(function() {
     assert(socket.authorized);
-    process.exit();
-  });
-});
+    socket.destroy();
+    server.close();
+  }));
+}));