add test cases for options.shell

Author: Renegade334

test/parallel/test-child-process-exec-enforce-shell.js

@@ -0,0 +1,23 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const { exec, execSync } = require('child_process');
+
+const invalidArgTypeError = {
+  code: 'ERR_INVALID_ARG_TYPE',
+  name: 'TypeError'
+};
+
+exec('echo should-be-passed-as-argument', { shell: '' }, common.mustSucceed((stdout, stderr) => {
+  assert.match(stdout, /should-be-passed-as-argument/);
+  assert.ok(!stderr);
+}));
+
+{
+  const ret = execSync('echo should-be-passed-as-argument', { encoding: 'utf-8', shell: '' });
+  assert.match(ret, /should-be-passed-as-argument/);
+}
+
+for (const fn of [exec, execSync]) {
+  assert.throws(() => fn('should-throw-on-boolean-shell-option', { shell: false }), invalidArgTypeError);
+}