Fix should() to throw with no argument

third_party/WebKit/LayoutTests/webaudio/resources/audit.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 /**
  * @fileOverview  WebAudio layout test utility library. Built around W3C's
  *                testharness.js. Includes asynchronous test task manager,
  *                assertion utilities.
  * @dependency    testharness.js
@@ skipping 933 matching lines @@
     get state () {
       return this._state;
     }
 
     get result () {
       return this._result;
     }
 
     // Start the assertion chain.
     should (actual, actualDescription) {
+      // If no argument is given, we cannot proceed. Halt.
+      if (arguments.length === 0)
+        _throwException('Task.should:: requires at least 1 argument.');
+
       return new Should(this, actual, actualDescription);
     }
 
     // Run this task. |this| task will be passed into the user-supplied test
     // task function.
     run () {
       this._state = TaskState.STARTED;
       this._taskFunction(
           this,
           this.should.bind(this));
@@ skipping 159 matching lines @@
         _logError('this test requires the explicit comparison with the '
             + 'expected result when it runs with run-webkit-tests.');
       }
 
       return new TaskRunner();
     }
 
   };
 
 })();