test: add regex check in test-vm-is-context

Use a regex to validate the error message. PR-URL: #12785 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: Jeyanthinath

test/parallel/test-vm-is-context.js

@@ -26,7 +26,7 @@ const vm = require('vm');
 
 assert.throws(function(){
 vm.isContext('string is not supported');
-},TypeError);
+},/^TypeError:sandboxmustbeanobject$/);
 
 assert.strictEqual(vm.isContext({}),false);
 assert.strictEqual(vm.isContext([]),false);