In rebaseline-cl: add option to only rebaseline tests changed in the CL.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl_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 optparse
 import json
 
 from webkitpy.common.checkout.scm.scm_mock import MockSCM
 from webkitpy.common.net.buildbot import Build
 from webkitpy.common.net.web_mock import MockWeb
@@ skipping 16 matching lines @@
                 'try_job_results': [
                     {
                         'builder': 'MOCK Try Win',
                         'buildnumber': 5000,
                     },
                     {
                         'builder': 'MOCK Mac Try',
                         'buildnumber': 4000,
                     },
                 ],
+                'files': {
+                    'third_party/WebKit/LayoutTests/fast/dom/prototype-inheritance.html': {'status': 'M'},
+                    'third_party/WebKit/LayoutTests/fast/dom/prototype-taco.html': {'status': 'M'},
+                },
             }),
         })
         self.tool.builders = BuilderList({
             "MOCK Try Win": {
                 "port_name": "test-win-win7",
                 "specifiers": ["Win7", "Release"],
                 "is_try_builder": True,
             },
             "MOCK Try Mac": {
                 "port_name": "test-mac-mac10.10",
                 "specifiers": ["Mac10.10", "Release"],
                 "is_try_builder": True,
             },
         })
         self.git = MockSCM()
         self.git.get_issue_number = lambda: 'None'
         self.command.git = lambda: self.git
 
     @staticmethod
     def command_options(**kwargs):
         options = {
+            'only_changed_tests': False,
+            'dry_run': False,
             'issue': None,
-            'dry_run': False,
             'optimize': True,
+            'results_directory': None,
             'verbose': False,
-            'results_directory': None,
         }
         options.update(kwargs)
         return optparse.Values(dict(**options))
 
     def test_execute_with_issue_number_given(self):
         oc = OutputCapture()
         try:
             oc.capture_output()
             self.command.execute(self.command_options(issue=11112222), [], self.tool)
         finally:
@@ skipping 28 matching lines @@
         self.assertMultiLineEqual(
             logs,
             ('Tests to rebaseline:\n'
              '  svg/dynamic-updates/SVGFEDropShadowElement-dom-stdDeviation-attr.html: MOCK Try Win (5000)\n'
              '  fast/dom/prototype-inheritance.html: MOCK Try Win (5000)\n'
              '  fast/dom/prototype-taco.html: MOCK Try Win (5000)\n'
              'Rebaselining fast/dom/prototype-inheritance.html\n'
              'Rebaselining fast/dom/prototype-taco.html\n'
              'Rebaselining svg/dynamic-updates/SVGFEDropShadowElement-dom-stdDeviation-attr.html\n'))
 
+    def test_execute_with_only_changed_tests_option(self):
+        oc = OutputCapture()
+        try:
+            oc.capture_output()
+            self.command.execute(self.command_options(issue=11112222, only_changed_tests=True), [], self.tool)
+        finally:
+            _, _, logs = oc.restore_output()
+        # svg/dynamic-updates/SVGFEDropShadowElement-dom-stdDeviation-attr.html
+        # is in the list of failed tests, but not in the list of files modified
+        # in the given CL; it should be included because all_tests is set to True.
+        self.assertMultiLineEqual(
+            logs,
+            ('Tests to rebaseline:\n'
+             '  fast/dom/prototype-inheritance.html: MOCK Try Win (5000)\n'
+             '  fast/dom/prototype-taco.html: MOCK Try Win (5000)\n'
+             'Rebaselining fast/dom/prototype-inheritance.html\n'
+             'Rebaselining fast/dom/prototype-taco.html\n'))
+
     def test_rebaseline_calls(self):
         """Tests the list of commands that are invoked when rebaseline is called."""
         # First write test contents to the mock filesystem so that
         # fast/dom/prototype-taco.html is considered a real test to rebaseline.
         # TODO(qyearsley): Change this to avoid accessing protected methods.
         # pylint: disable=protected-access
         port = self.tool.port_factory.get('test-win-win7')
         self._write(
             port._filesystem.join(port.layout_tests_dir(), 'fast/dom/prototype-taco.html'),
             'test contents')
 
         self.command._rebaseline(
             self.command_options(issue=11112222),
             {"fast/dom/prototype-taco.html": {Build("MOCK Try Win", 5000): ["txt", "png"]}})
 
         self.assertEqual(
             self.tool.executive.calls,
             [
                 [['python', 'echo', 'copy-existing-baselines-internal', '--suffixes', 'txt',
                   '--builder', 'MOCK Try Win', '--test', 'fast/dom/prototype-taco.html', '--build-number', '5000']],
                 [['python', 'echo', 'rebaseline-test-internal', '--suffixes', 'txt',
                   '--builder', 'MOCK Try Win', '--test', 'fast/dom/prototype-taco.html', '--build-number', '5000']],
                 [['python', 'echo', 'optimize-baselines', '--no-modify-scm', '--suffixes', 'txt', 'fast/dom/prototype-taco.html']]
             ])