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test/pseudo-tty/ref_keeps_node_running.js

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+// Flags: --expose-internals --no-warnings
+'use strict';
+
+require('../common');
+
+const { internalBinding } = require('internal/test/binding');
+const { TTY, isTTY } = internalBinding('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();