test: make test-tls-connect checks more strict

Check the error code on expected errors so that the introduction of
different errors in refactoring is caught.

While at it, re-order modules alphabetically per test-writing guide.

PR-URL: #14695
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-tls-connect.js

@@ -1,13 +1,13 @@
 'use strict';
 const common = require('../common');
-const assert = require('assert');
 
 if (!common.hasCrypto)
   common.skip('missing crypto');
 
-const tls = require('tls');
+const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
+const tls = require('tls');
 
 // https://github.com/joyent/node/issues/1218
 // uncatchable exception on TLS connection error
@@ -18,7 +18,10 @@ const path = require('path');
   const options = {cert: cert, key: key, port: common.PORT};
   const conn = tls.connect(options, common.fail);
 
-  conn.on('error', common.mustCall());
+  conn.on(
+    'error',
+    common.mustCall((e) => { assert.strictEqual(e.code, 'ECONNREFUSED'); })
+  );
 }
 
 // SSL_accept/SSL_connect error handling
@@ -35,5 +38,8 @@ const path = require('path');
     assert.ok(false); // callback should never be executed
   });
 
-  conn.on('error', common.mustCall());
+  conn.on(
+    'error',
+    common.mustCall((e) => { assert.strictEqual(e.code, 'ECONNREFUSED'); })
+  );
 }