test: remove getTTYfd() from common module

common.getTTYfd() is used in one test only. Move it's definition to that
test and out of the common module.

PR-URL: nodejs#17781
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/common/index.js

@@ -823,23 +823,6 @@ exports.crashOnUnhandledRejection = function() {
              (err) => process.nextTick(() => { throw err; }));
 };
 
-exports.getTTYfd = function getTTYfd() {
-  const tty = require('tty');
-  let tty_fd = 0;
-  if (!tty.isatty(tty_fd)) tty_fd++;
-  else if (!tty.isatty(tty_fd)) tty_fd++;
-  else if (!tty.isatty(tty_fd)) tty_fd++;
-  else {
-    try {
-      tty_fd = fs.openSync('/dev/tty');
-    } catch (e) {
-      // There aren't any tty fd's available to use.
-      return -1;
-    }
-  }
-  return tty_fd;
-};
-
 // Hijack stdout and stderr
 const stdWrite = {};
 function hijackStdWritable(name, listener) {

test/sequential/test-async-wrap-getasyncid.js

@@ -247,7 +247,24 @@ if (common.hasCrypto) { // eslint-disable-line crypto-check
 
 {
   // Do our best to grab a tty fd.
-  const tty_fd = common.getTTYfd();
+  function getTTYfd() {
+    const tty = require('tty');
+    let tty_fd = 0;
+    if (!tty.isatty(tty_fd)) tty_fd++;
+    else if (!tty.isatty(tty_fd)) tty_fd++;
+    else if (!tty.isatty(tty_fd)) tty_fd++;
+    else {
+      try {
+        tty_fd = fs.openSync('/dev/tty');
+      } catch (e) {
+        // There aren't any tty fd's available to use.
+        return -1;
+      }
+    }
+    return tty_fd;
+  }
+
+  const tty_fd = getTTYfd();
   if (tty_fd >= 0) {
     const tty_wrap = process.binding('tty_wrap');
     // fd may still be invalid, so guard against it.