test: check type for Worker filename argument

Add test to check type for first argument of Worker to increase
coverage.

PR-URL: https://github.com/nodejs/node/pull/21620
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

test/parallel/test-worker-type-check.js

@@ -0,0 +1,28 @@
+// Flags: --experimental-worker
+'use strict';
+
+const common = require('../common');
+const { Worker } = require('worker_threads');
+
+{
+  [
+    undefined,
+    null,
+    false,
+    0,
+    Symbol('test'),
+    {},
+    [],
+    () => {}
+  ].forEach((val) => {
+    common.expectsError(
+      () => new Worker(val),
+      {
+        code: 'ERR_INVALID_ARG_TYPE',
+        type: TypeError,
+        message: 'The "filename" argument must be of type string. ' +
+                 `Received type ${typeof val}`
+      }
+    );
+  });
+}