tty: add ref() so process.stdin.ref() etc. work

Also squashed from:
* test: move tty-wrap isrefed test to pseudo-tty/
* test: test tty-wrap handle isrefed properly
* test: improve failure messages in isrefed tests

PR-URL: https://github.com/nodejs/node/pull/7360
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: James M Snell <jasnell.gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/test/pseudo-tty/ref_keeps_node_running.js b/test/pseudo-tty/ref_keeps_node_running.js
new file mode 100644
index 0000000000..de3c6531ef
--- /dev/null
+++ b/test/pseudo-tty/ref_keeps_node_running.js
@@ -0,0 +1,27 @@
+'use strict';
+require('../common');
+
+const { TTY, isTTY } = process.binding('tty_wrap');
+const strictEqual = require('assert').strictEqual;
+
+strictEqual(isTTY(0), true, 'fd 0 is not a TTY');
+
+const handle = new TTY(0);
+handle.readStart();
+handle.onread = () => {};
+
+function isHandleActive(handle) {
+  return process._getActiveHandles().some((active) => active === handle);
+}
+
+strictEqual(isHandleActive(handle), true, 'TTY handle not initially active');
+
+handle.unref();
+
+strictEqual(isHandleActive(handle), false, 'TTY handle active after unref()');
+
+handle.ref();
+
+strictEqual(isHandleActive(handle), true, 'TTY handle inactive after ref()');
+
+handle.unref();