test: add test for SIGWINCH handling by stdio.js

PR-URL: https://github.com/nodejs/node/pull/10063
Reviewed-By: James M Snell <jasnell@gmail.com>

test/pseudo-tty/test-stderr-stdout-handle-sigwinch.js

@@ -0,0 +1,29 @@
+'use strict';
+const common = require('../common');
+
+const originalRefreshSizeStderr = process.stderr._refreshSize;
+const originalRefreshSizeStdout = process.stdout._refreshSize;
+
+const wrap = (fn, ioStream, string) => {
+  return () => {
+    // The console.log() call prints a string that is in the .out file. In other
+    // words, the console.log() is part of the test, not extraneous debugging.
+    console.log(string);
+    try {
+      fn.call(ioStream);
+    } catch (e) {
+      // EINVAL happens on SmartOS if emulation is incomplete
+      if (!common.isSunOS || e.code !== 'EINVAL')
+        throw e;
+    }
+  };
+};
+
+process.stderr._refreshSize = wrap(originalRefreshSizeStderr,
+                                   process.stderr,
+                                   'calling stderr._refreshSize');
+process.stdout._refreshSize = wrap(originalRefreshSizeStdout,
+                                   process.stdout,
+                                   'calling stdout._refreshSize');
+
+process.emit('SIGWINCH');

test/pseudo-tty/test-stderr-stdout-handle-sigwinch.out

@@ -0,0 +1,2 @@
+calling stdout._refreshSize
+calling stderr._refreshSize