test: test validity of prefix in mkdtempSync

This test is checking for the validity of the path used as parameter
for mkdtempSync.

PR-URL: https://github.com/nodejs/node/pull/12009
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

test/parallel/test-mkdtemp-sync-prefix-check.js

@@ -0,0 +1,13 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const fs = require('fs');
+
+const assertValues = [undefined, null, 0, true, false, 1];
+
+assertValues.forEach((assertValue) => {
+  assert.throws(
+    () => fs.mkdtempSync(assertValue, {}),
+    /^TypeError: filename prefix is required$/
+  );
+});