test: add process no deprecation

PR-URL: https://github.com/nodejs/node/pull/24196
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/parallel/test-child-process-no-deprecation.js

@@ -0,0 +1,15 @@
+'use strict';
+const common = require('../common');
+process.noDeprecation = true;
+
+if (process.argv[2] === 'child') {
+  process.emitWarning('Something else is deprecated.', 'DeprecationWarning');
+} else {
+  // parent process
+  const spawn = require('child_process').spawn;
+
+  // spawn self as child
+  const child = spawn(process.execPath, [process.argv[1], 'child']);
+
+  child.stderr.on('data', common.mustNotCall());
+}