Test for Issue 16407

tests/compiler/dart2js_extra/16407_test.dart

Index: tests/compiler/dart2js_extra/16407_test.dart
diff --git a/site/try/bugs/isolate_worker_bug.dart b/tests/compiler/dart2js_extra/16407_test.dart
similarity index 52%
copy from site/try/bugs/isolate_worker_bug.dart
copy to tests/compiler/dart2js_extra/16407_test.dart
index 0f46014e70c45438e9d50b7cf97948aa239d7b08..aff1ba337ddab1eb5d219ac635653b48d4f8d1bc 100644
--- a/site/try/bugs/isolate_worker_bug.dart
+++ b/tests/compiler/dart2js_extra/16407_test.dart
@@ -2,15 +2,15 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// Successful test: output div contains "future!".
+import "package:expect/expect.dart";
 
-import 'dart:async';
+// Regression test for Issue 16407.
 
-const greeting = "Hello, cool people doing nice things!";
-
-// Prints a greeting.
 void main() {
-  print(greeting);
-
-  new Future(() => print("future!"));
+  foo(null, true);
+  foo('x', false);
 }
+
+var foo = (x, result) {
+  Expect.equals(result, x is Null, '$x is Null');
+};