test: add test for process.stdin.setRawMode()

adds a basic test for process.stdin.setRawMode to ensure that the isRaw
property is properly changed

PR-URL: #10037
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Jonathan Darling

test/pseudo-tty/stdin-setrawmode.js

@@ -0,0 +1,9 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+
+process.stdin.setRawMode(true);
+assert.strictEqual(process.stdin.isRaw, true);
+
+process.stdin.setRawMode(false);
+assert.strictEqual(process.stdin.isRaw, false);