In WPT importer, abort if there are exportable-but-not-yet-exported commits.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/deps_updater_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 webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.w3c.deps_updater import DepsUpdater
 
 
 class DepsUpdaterTest(unittest.TestCase):
 
+    def test_abort_on_exportable_commits(self):
+        updater = DepsUpdater(MockHost())
+        updater.exportable_but_not_exported_commits = lambda _: ['aaaa']
+        return_code = updater.main(['wpt'])
+        self.assertEqual(return_code, 1)
+
     def test_generate_email_list(self):
         updater = DepsUpdater(MockHost())
         changed_files = [
             'third_party/WebKit/LayoutTests/foo/bar/file.html',
             'third_party/WebKit/LayoutTests/foo/bar/otherfile.html',
             'third_party/WebKit/LayoutTests/foo/baz/files.html',
             'some/non-test.file',
         ]
         directory_to_owner = {
             'foo/bar': 'someone@gmail.com',
@@ skipping 118 matching lines @@
                     '--work',
                     '--tests-root',
                     '/mock-checkout/third_party/WebKit/LayoutTests/external/wpt'
                 ],
                 [
                     'git',
                     'add',
                     '/mock-checkout/third_party/WebKit/LayoutTests/external/wpt/MANIFEST.json'
                 ]
             ])