Reland of [Telemetry] Switch clients to new JavaScript API (batch 5)

telemetry/telemetry/util/js_template_unittest.py

 # 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.
 
 import unittest
 
 from telemetry.util import js_template
 
 
 class JavaScriptTemplateTest(unittest.TestCase):
@@ skipping 11 matching lines @@
             selector='.r > a[href*="wikipedia"]'),
         r'function(elem) { return elem.find(".r > a[href*=\"wikipedia\"]"); }')
 
   def testRenderWithLiteralValues(self):
     self.assertEquals(
         js_template.Render(
             'var {{ @var_name }} = {{ x }} + {{ y }};',
             var_name='foo', x='bar', y=None),
         'var foo = "bar" + null;')
 
+  def testRenderWithArgumentExpansion(self):
+    self.assertEquals(
+        js_template.Render(
+            '{{ @f }}({{ *args }})', f='foo', args=(1, 'hi!', None)),
+        'foo(1, "hi!", null)')
+
   def testRenderRaisesWithUnknownIdentifier(self):
     with self.assertRaises(KeyError):
       js_template.Render('foo({{ some_name }})', another_name='bar')
 
   def testRenderRaisesWithBadIdentifier(self):
     with self.assertRaises(KeyError):
       js_template.Render('foo({{ bad identifier name }})', name='bar')
 
   def testRenderRaisesWithBadLiteralValue(self):
     with self.assertRaises(ValueError):
       js_template.Render('function() { {{ @code }} }', code=['foo', 'bar'])
 
   def testRenderRaisesWithUnusedKeywordArgs(self):
     with self.assertRaises(TypeError):
       js_template.Render('foo = {{ x }};', x=4, y=5, timemout=6)