Enable compiling mjsunit tests as ES6 modules

test/mjsunit/testcfg.py

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 import os
 import re
 
 from testrunner.local import testsuite
 from testrunner.objects import testcase
 
 FLAGS_PATTERN = re.compile(r"//\s+Flags:(.*)")
 FILES_PATTERN = re.compile(r"//\s+Files:(.*)")
 SELF_SCRIPT_PATTERN = re.compile(r"//\s+Env: TEST_FILE_NAME")
+MODULE_PATTERN = re.compile(r"^// MODULE$", flags=re.MULTILINE)
 
 
 class MjsunitTestSuite(testsuite.TestSuite):
 
   def __init__(self, name, root):
     super(MjsunitTestSuite, self).__init__(name, root)
 
   def ListTests(self, context):
     tests = []
     for dirname, dirs, files in os.walk(self.root):
@@ skipping 26 matching lines @@
         break
     files = [ os.path.normpath(os.path.join(self.root, '..', '..', f))
               for f in files_list ]
     testfilename = os.path.join(self.root, testcase.path + self.suffix())
     if SELF_SCRIPT_PATTERN.search(source):
       env = ["-e", "TEST_FILE_NAME=\"%s\"" % testfilename.replace("\\", "\\\\")]
       files = env + files
 
     if not context.no_harness:
       files.append(os.path.join(self.root, "mjsunit.js"))
+
+    if MODULE_PATTERN.search(source):
+      files.append("--module")
     files.append(testfilename)
 
     flags += files
     if context.isolates:
       flags.append("--isolate")
       flags += files
 
     return testcase.flags + flags
 
   def GetSourceForTest(self, testcase):
     filename = os.path.join(self.root, testcase.path + self.suffix())
     with open(filename) as f:
       return f.read()
 
 
 def GetSuite(name, root):
   return MjsunitTestSuite(name, root)