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BUG=b:233893248
TEST=CQ

Change-Id: I66591d7a738d241aed3290138c0f68065ab10a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3879174
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/scripts/cbuildbot_launch_unittest.py b/scripts/cbuildbot_launch_unittest.py
index 409508e..9e71864 100644
--- a/scripts/cbuildbot_launch_unittest.py
+++ b/scripts/cbuildbot_launch_unittest.py
@@ -19,7 +19,7 @@
 from chromite.scripts import cbuildbot_launch
 
 
-EXPECTED_MANIFEST_URL = 'https://chrome-internal-review.googlesource.com/chromeos/manifest-internal'  # pylint: disable=line-too-long
+EXPECTED_MANIFEST_URL = "https://chrome-internal-review.googlesource.com/chromeos/manifest-internal"  # pylint: disable=line-too-long
 
 
 # It's reasonable for unittests to look at internals.
@@ -27,745 +27,926 @@
 
 
 class FakeException(Exception):
-  """Test exception to raise during tests."""
+    """Test exception to raise during tests."""
 
 
 class CbuildbotLaunchTest(cros_test_lib.MockTestCase):
-  """Tests for cbuildbot_launch script."""
+    """Tests for cbuildbot_launch script."""
 
-  def testPreParseArguments(self):
-    """Test that we can correctly extract branch values from cbuildbot args."""
-    CASES = (
-        (['--buildroot', '/buildroot', 'daisy-incremental'],
-         (None, '/buildroot', None)),
+    def testPreParseArguments(self):
+        """Test that we can correctly extract branch values from cbuildbot args."""
+        CASES = (
+            (
+                ["--buildroot", "/buildroot", "daisy-incremental"],
+                (None, "/buildroot", None),
+            ),
+            (
+                [
+                    "--buildbot",
+                    "--buildroot",
+                    "/buildroot",
+                    "--git-cache-dir",
+                    "/git-cache",
+                    "-b",
+                    "release-R57-9202.B",
+                    "daisy-incremental",
+                ],
+                ("release-R57-9202.B", "/buildroot", "/git-cache"),
+            ),
+            (
+                [
+                    "--debug",
+                    "--buildbot",
+                    "--notests",
+                    "--buildroot",
+                    "/buildroot",
+                    "--git-cache-dir",
+                    "/git-cache",
+                    "--branch",
+                    "release-R57-9202.B",
+                    "daisy-incremental",
+                ],
+                ("release-R57-9202.B", "/buildroot", "/git-cache"),
+            ),
+        )
 
-        (['--buildbot', '--buildroot', '/buildroot',
-          '--git-cache-dir', '/git-cache',
-          '-b', 'release-R57-9202.B',
-          'daisy-incremental'],
-         ('release-R57-9202.B', '/buildroot', '/git-cache')),
+        for cmd_args, expected in CASES:
+            expected_branch, expected_buildroot, expected_cache_dir = expected
 
-        (['--debug', '--buildbot', '--notests',
-          '--buildroot', '/buildroot',
-          '--git-cache-dir', '/git-cache',
-          '--branch', 'release-R57-9202.B',
-          'daisy-incremental'],
-         ('release-R57-9202.B', '/buildroot', '/git-cache')),
-    )
+            options = cbuildbot_launch.PreParseArguments(cmd_args)
 
-    for cmd_args, expected in CASES:
-      expected_branch, expected_buildroot, expected_cache_dir = expected
+            self.assertEqual(options.branch, expected_branch)
+            self.assertEqual(options.buildroot, expected_buildroot)
+            self.assertEqual(options.git_cache_dir, expected_cache_dir)
 
-      options = cbuildbot_launch.PreParseArguments(cmd_args)
+    def testInitialCheckout(self):
+        """Test InitialCheckout with minimum settings."""
+        mock_repo = mock.MagicMock()
+        mock_repo.branch = "branch"
+        argv = ["-r", "/root", "config"]
+        options = cbuildbot_launch.PreParseArguments(argv)
 
-      self.assertEqual(options.branch, expected_branch)
-      self.assertEqual(options.buildroot, expected_buildroot)
-      self.assertEqual(options.git_cache_dir, expected_cache_dir)
+        cbuildbot_launch.InitialCheckout(mock_repo, options)
 
-  def testInitialCheckout(self):
-    """Test InitialCheckout with minimum settings."""
-    mock_repo = mock.MagicMock()
-    mock_repo.branch = 'branch'
-    argv = ['-r', '/root', 'config']
-    options = cbuildbot_launch.PreParseArguments(argv)
+        self.assertEqual(
+            mock_repo.mock_calls,
+            [
+                mock.call.PreLoad("/preload/chromeos"),
+                mock.call.Sync(jobs=32, detach=True, downgrade_repo=False),
+            ],
+        )
 
-    cbuildbot_launch.InitialCheckout(mock_repo, options)
+    def testConfigureGlobalEnvironment(self):
+        """Ensure that we can setup our global runtime environment correctly."""
 
-    self.assertEqual(mock_repo.mock_calls, [
-        mock.call.PreLoad('/preload/chromeos'),
-        mock.call.Sync(jobs=32, detach=True, downgrade_repo=False),
-    ])
+        os.environ.pop("LANG", None)
+        os.environ["LC_MONETARY"] = "bad"
 
-  def testConfigureGlobalEnvironment(self):
-    """Ensure that we can setup our global runtime environment correctly."""
+        cbuildbot_launch.ConfigureGlobalEnvironment()
 
-    os.environ.pop('LANG', None)
-    os.environ['LC_MONETARY'] = 'bad'
+        # Verify umask is updated.
+        self.assertEqual(os.umask(0), 0o22)
 
-    cbuildbot_launch.ConfigureGlobalEnvironment()
-
-    # Verify umask is updated.
-    self.assertEqual(os.umask(0), 0o22)
-
-    # Verify ENVs are cleaned up.
-    self.assertEqual(os.environ['LANG'], 'en_US.UTF-8')
-    self.assertNotIn('LC_MONETARY', os.environ)
+        # Verify ENVs are cleaned up.
+        self.assertEqual(os.environ["LANG"], "en_US.UTF-8")
+        self.assertNotIn("LC_MONETARY", os.environ)
 
 
 class RunTests(cros_test_lib.RunCommandTestCase):
-  """Tests for cbuildbot_launch script."""
+    """Tests for cbuildbot_launch script."""
 
-  ARGS_BASE = ['--buildroot', '/buildroot']
-  EXPECTED_ARGS_BASE = ['--buildroot', '/cbuildbot_buildroot']
-  ARGS_GIT_CACHE = ['--git-cache-dir', '/git-cache']
-  ARGS_CONFIG = ['config']
-  CMD = ['/cbuildbot_buildroot/chromite/bin/cbuildbot']
+    ARGS_BASE = ["--buildroot", "/buildroot"]
+    EXPECTED_ARGS_BASE = ["--buildroot", "/cbuildbot_buildroot"]
+    ARGS_GIT_CACHE = ["--git-cache-dir", "/git-cache"]
+    ARGS_CONFIG = ["config"]
+    CMD = ["/cbuildbot_buildroot/chromite/bin/cbuildbot"]
 
-  def verifyCbuildbot(self, args, expected_cmd, version):
-    """Ensure we invoke cbuildbot correctly."""
-    self.PatchObject(
-        commands, 'GetTargetChromiteApiVersion', autospec=True,
-        return_value=version)
+    def verifyCbuildbot(self, args, expected_cmd, version):
+        """Ensure we invoke cbuildbot correctly."""
+        self.PatchObject(
+            commands,
+            "GetTargetChromiteApiVersion",
+            autospec=True,
+            return_value=version,
+        )
 
-    cbuildbot_launch.Cbuildbot('/cbuildbot_buildroot', '/depot_tools', args)
+        cbuildbot_launch.Cbuildbot("/cbuildbot_buildroot", "/depot_tools", args)
 
-    self.assertCommandCalled(
-        expected_cmd, extra_env={'PATH': mock.ANY},
-        cwd='/cbuildbot_buildroot', check=False)
+        self.assertCommandCalled(
+            expected_cmd,
+            extra_env={"PATH": mock.ANY},
+            cwd="/cbuildbot_buildroot",
+            check=False,
+        )
 
-  def testCbuildbotSimple(self):
-    """Ensure we invoke cbuildbot correctly."""
-    self.verifyCbuildbot(
-        self.ARGS_BASE + self.ARGS_CONFIG,
-        self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
-        (0, 4))
+    def testCbuildbotSimple(self):
+        """Ensure we invoke cbuildbot correctly."""
+        self.verifyCbuildbot(
+            self.ARGS_BASE + self.ARGS_CONFIG,
+            self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
+            (0, 4),
+        )
 
-  def testCbuildbotNotFiltered(self):
-    """Ensure we invoke cbuildbot correctly."""
-    self.verifyCbuildbot(
-        self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
-        (self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE +
-         self.ARGS_GIT_CACHE),
-        (0, 4))
+    def testCbuildbotNotFiltered(self):
+        """Ensure we invoke cbuildbot correctly."""
+        self.verifyCbuildbot(
+            self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
+            (
+                self.CMD
+                + self.ARGS_CONFIG
+                + self.EXPECTED_ARGS_BASE
+                + self.ARGS_GIT_CACHE
+            ),
+            (0, 4),
+        )
 
-  def testCbuildbotFiltered(self):
-    """Ensure we invoke cbuildbot correctly."""
-    self.verifyCbuildbot(
-        self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
-        self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
-        (0, 2))
+    def testCbuildbotFiltered(self):
+        """Ensure we invoke cbuildbot correctly."""
+        self.verifyCbuildbot(
+            self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
+            self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
+            (0, 2),
+        )
 
-  def testMainMin(self):
-    """Test a minimal set of command line options."""
-    self.PatchObject(osutils, 'SafeMakedirs', autospec=True)
-    self.PatchObject(commands, 'GetTargetChromiteApiVersion',
-                     autospec=True, return_value=(constants.REEXEC_API_MAJOR,
-                                                  constants.REEXEC_API_MINOR))
-    mock_repo = mock.MagicMock()
-    mock_repo.branch = 'main'
-    mock_repo.directory = '/root/repository'
+    def testMainMin(self):
+        """Test a minimal set of command line options."""
+        self.PatchObject(osutils, "SafeMakedirs", autospec=True)
+        self.PatchObject(
+            commands,
+            "GetTargetChromiteApiVersion",
+            autospec=True,
+            return_value=(
+                constants.REEXEC_API_MAJOR,
+                constants.REEXEC_API_MINOR,
+            ),
+        )
+        mock_repo = mock.MagicMock()
+        mock_repo.branch = "main"
+        mock_repo.directory = "/root/repository"
 
-    mock_repo_create = self.PatchObject(repository, 'RepoRepository',
-                                        autospec=True, return_value=mock_repo)
-    mock_clean = self.PatchObject(cbuildbot_launch, 'CleanBuildRoot',
-                                  autospec=True)
-    mock_checkout = self.PatchObject(cbuildbot_launch, 'InitialCheckout',
-                                     autospec=True)
-    mock_cleanup_chroot = self.PatchObject(cbuildbot_launch, 'CleanupChroot',
-                                           autospec=True)
-    mock_set_last_build_state = self.PatchObject(
-        cbuildbot_launch, 'SetLastBuildState', autospec=True)
+        mock_repo_create = self.PatchObject(
+            repository, "RepoRepository", autospec=True, return_value=mock_repo
+        )
+        mock_clean = self.PatchObject(
+            cbuildbot_launch, "CleanBuildRoot", autospec=True
+        )
+        mock_checkout = self.PatchObject(
+            cbuildbot_launch, "InitialCheckout", autospec=True
+        )
+        mock_cleanup_chroot = self.PatchObject(
+            cbuildbot_launch, "CleanupChroot", autospec=True
+        )
+        mock_set_last_build_state = self.PatchObject(
+            cbuildbot_launch, "SetLastBuildState", autospec=True
+        )
 
-    expected_build_state = build_summary.BuildSummary(
-        build_number=0, master_build_id=0, status=mock.ANY,
-        buildroot_layout=2, branch='main')
+        expected_build_state = build_summary.BuildSummary(
+            build_number=0,
+            master_build_id=0,
+            status=mock.ANY,
+            buildroot_layout=2,
+            branch="main",
+        )
 
-    argv = ['-r', '/root', 'config']
-    options = cbuildbot_launch.PreParseArguments(argv)
-    cbuildbot_launch._main(options, argv)
+        argv = ["-r", "/root", "config"]
+        options = cbuildbot_launch.PreParseArguments(argv)
+        cbuildbot_launch._main(options, argv)
 
-    # Did we create the repo instance correctly?
-    self.assertEqual(mock_repo_create.mock_calls,
-                     [mock.call(EXPECTED_MANIFEST_URL, '/root/repository',
-                                git_cache_dir=None, branch='main')])
+        # Did we create the repo instance correctly?
+        self.assertEqual(
+            mock_repo_create.mock_calls,
+            [
+                mock.call(
+                    EXPECTED_MANIFEST_URL,
+                    "/root/repository",
+                    git_cache_dir=None,
+                    branch="main",
+                )
+            ],
+        )
 
-    # Ensure we clean, as expected.
-    self.assertEqual(mock_clean.mock_calls, [
-        mock.call('/root', mock_repo, '/root/repository/.cache',
-                  expected_build_state, False)])
+        # Ensure we clean, as expected.
+        self.assertEqual(
+            mock_clean.mock_calls,
+            [
+                mock.call(
+                    "/root",
+                    mock_repo,
+                    "/root/repository/.cache",
+                    expected_build_state,
+                    False,
+                )
+            ],
+        )
 
-    # Ensure we checkout, as expected.
-    self.assertEqual(mock_checkout.mock_calls,
-                     [mock.call(mock_repo, options)])
+        # Ensure we checkout, as expected.
+        self.assertEqual(
+            mock_checkout.mock_calls, [mock.call(mock_repo, options)]
+        )
 
-    # Ensure we invoke cbuildbot, as expected.
-    self.assertCommandCalled(
-        [
-            '/root/repository/chromite/bin/cbuildbot',
-            'config',
-            '-r', '/root/repository',
-            '--workspace', '/root/workspace',
-            '--cache-dir', '/root/repository/.cache',
-            # The duplication is a bug, but not harmful.
-            '--cache-dir', '/root/repository/.cache',
-        ],
-        extra_env={'PATH': mock.ANY},
-        cwd='/root/repository',
-        check=False)
+        # Ensure we invoke cbuildbot, as expected.
+        self.assertCommandCalled(
+            [
+                "/root/repository/chromite/bin/cbuildbot",
+                "config",
+                "-r",
+                "/root/repository",
+                "--workspace",
+                "/root/workspace",
+                "--cache-dir",
+                "/root/repository/.cache",
+                # The duplication is a bug, but not harmful.
+                "--cache-dir",
+                "/root/repository/.cache",
+            ],
+            extra_env={"PATH": mock.ANY},
+            cwd="/root/repository",
+            check=False,
+        )
 
-    # Ensure we saved the final state, as expected.
-    self.assertEqual(expected_build_state.status,
-                     constants.BUILDER_STATUS_PASSED)
-    self.assertEqual(mock_set_last_build_state.mock_calls, [
-        mock.call('/root', expected_build_state)])
+        # Ensure we saved the final state, as expected.
+        self.assertEqual(
+            expected_build_state.status, constants.BUILDER_STATUS_PASSED
+        )
+        self.assertEqual(
+            mock_set_last_build_state.mock_calls,
+            [mock.call("/root", expected_build_state)],
+        )
 
-    # Ensure we clean the chroot, as expected.
-    mock_cleanup_chroot.assert_called_once_with('/root/repository')
+        # Ensure we clean the chroot, as expected.
+        mock_cleanup_chroot.assert_called_once_with("/root/repository")
 
-  def testMainMax(self):
-    """Test a larger set of command line options."""
-    self.PatchObject(osutils, 'SafeMakedirs', autospec=True)
-    self.PatchObject(commands, 'GetTargetChromiteApiVersion',
-                     autospec=True, return_value=(constants.REEXEC_API_MAJOR,
-                                                  constants.REEXEC_API_MINOR))
-    mock_repo = mock.MagicMock()
-    mock_repo.branch = 'branch'
-    mock_repo.directory = '/root/repository'
+    def testMainMax(self):
+        """Test a larger set of command line options."""
+        self.PatchObject(osutils, "SafeMakedirs", autospec=True)
+        self.PatchObject(
+            commands,
+            "GetTargetChromiteApiVersion",
+            autospec=True,
+            return_value=(
+                constants.REEXEC_API_MAJOR,
+                constants.REEXEC_API_MINOR,
+            ),
+        )
+        mock_repo = mock.MagicMock()
+        mock_repo.branch = "branch"
+        mock_repo.directory = "/root/repository"
 
-    mock_summary = build_summary.BuildSummary(
-        build_number=313,
-        master_build_id=123123123,
-        status=constants.BUILDER_STATUS_FAILED,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branch')
+        mock_summary = build_summary.BuildSummary(
+            build_number=313,
+            master_build_id=123123123,
+            status=constants.BUILDER_STATUS_FAILED,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branch",
+        )
 
-    mock_get_last_build_state = self.PatchObject(
-        cbuildbot_launch, 'GetLastBuildState', autospec=True,
-        return_value=mock_summary)
-    mock_repo_create = self.PatchObject(repository, 'RepoRepository',
-                                        autospec=True, return_value=mock_repo)
-    mock_clean = self.PatchObject(cbuildbot_launch, 'CleanBuildRoot',
-                                  autospec=True)
-    mock_checkout = self.PatchObject(cbuildbot_launch, 'InitialCheckout',
-                                     autospec=True)
-    mock_cleanup_chroot = self.PatchObject(cbuildbot_launch, 'CleanupChroot',
-                                           autospec=True)
-    mock_set_last_build_state = self.PatchObject(
-        cbuildbot_launch, 'SetLastBuildState', autospec=True)
-    argv = ['--buildroot', '/root',
-            '--branch', 'branch',
-            '--git-cache-dir', '/git-cache',
-            '--cache-dir', '/cache',
-            '--remote-trybot',
-            '--master-build-id', '123456789',
-            '--buildnumber', '314',
-            'config']
-    options = cbuildbot_launch.PreParseArguments(argv)
-    cbuildbot_launch._main(options, argv)
+        mock_get_last_build_state = self.PatchObject(
+            cbuildbot_launch,
+            "GetLastBuildState",
+            autospec=True,
+            return_value=mock_summary,
+        )
+        mock_repo_create = self.PatchObject(
+            repository, "RepoRepository", autospec=True, return_value=mock_repo
+        )
+        mock_clean = self.PatchObject(
+            cbuildbot_launch, "CleanBuildRoot", autospec=True
+        )
+        mock_checkout = self.PatchObject(
+            cbuildbot_launch, "InitialCheckout", autospec=True
+        )
+        mock_cleanup_chroot = self.PatchObject(
+            cbuildbot_launch, "CleanupChroot", autospec=True
+        )
+        mock_set_last_build_state = self.PatchObject(
+            cbuildbot_launch, "SetLastBuildState", autospec=True
+        )
+        argv = [
+            "--buildroot",
+            "/root",
+            "--branch",
+            "branch",
+            "--git-cache-dir",
+            "/git-cache",
+            "--cache-dir",
+            "/cache",
+            "--remote-trybot",
+            "--master-build-id",
+            "123456789",
+            "--buildnumber",
+            "314",
+            "config",
+        ]
+        options = cbuildbot_launch.PreParseArguments(argv)
+        cbuildbot_launch._main(options, argv)
 
-    # Did we create the repo instance correctly?
-    self.assertEqual(mock_repo_create.mock_calls,
-                     [mock.call(EXPECTED_MANIFEST_URL, '/root/repository',
-                                git_cache_dir='/git-cache', branch='branch')])
+        # Did we create the repo instance correctly?
+        self.assertEqual(
+            mock_repo_create.mock_calls,
+            [
+                mock.call(
+                    EXPECTED_MANIFEST_URL,
+                    "/root/repository",
+                    git_cache_dir="/git-cache",
+                    branch="branch",
+                )
+            ],
+        )
 
-    # Ensure we look up the previous status.
-    self.assertEqual(mock_get_last_build_state.mock_calls, [
-        mock.call('/root')])
+        # Ensure we look up the previous status.
+        self.assertEqual(
+            mock_get_last_build_state.mock_calls, [mock.call("/root")]
+        )
 
-    # Ensure we clean, as expected.
-    self.assertEqual(mock_clean.mock_calls, [
-        mock.call('/root',
-                  mock_repo,
-                  '/cache',
-                  build_summary.BuildSummary(
-                      build_number=314,
-                      master_build_id=123456789,
-                      status=mock.ANY,
-                      branch='branch',
-                      buildroot_layout=2
-                  ), False)])
+        # Ensure we clean, as expected.
+        self.assertEqual(
+            mock_clean.mock_calls,
+            [
+                mock.call(
+                    "/root",
+                    mock_repo,
+                    "/cache",
+                    build_summary.BuildSummary(
+                        build_number=314,
+                        master_build_id=123456789,
+                        status=mock.ANY,
+                        branch="branch",
+                        buildroot_layout=2,
+                    ),
+                    False,
+                )
+            ],
+        )
 
-    # Ensure we checkout, as expected.
-    self.assertEqual(mock_checkout.mock_calls,
-                     [mock.call(mock_repo, options)])
+        # Ensure we checkout, as expected.
+        self.assertEqual(
+            mock_checkout.mock_calls, [mock.call(mock_repo, options)]
+        )
 
-    # Ensure we invoke cbuildbot, as expected.
-    self.assertCommandCalled(
-        [
-            '/root/repository/chromite/bin/cbuildbot',
-            'config',
-            '--buildroot', '/root/repository',
-            '--branch', 'branch',
-            '--git-cache-dir', '/git-cache',
-            '--cache-dir', '/cache',
-            '--remote-trybot',
-            '--master-build-id', '123456789',
-            '--buildnumber', '314',
-            '--previous-build-state',
-            'eyJicmFuY2giOiJicmFuY2giLCJidWlsZF9udW1iZXIiOjMxMywiYnVpbGRyb290X'
-            '2xheW91dCI6MiwibWFzdGVyX2J1aWxkX2lkIjoxMjMxMjMxMjMsInN0YXR1cyI6Im'
-            'ZhaWwifQ==',
-            '--workspace', '/root/workspace',
-            '--cache-dir', '/cache',
-        ],
-        extra_env={'PATH': mock.ANY},
-        cwd='/root/repository',
-        check=False)
+        # Ensure we invoke cbuildbot, as expected.
+        self.assertCommandCalled(
+            [
+                "/root/repository/chromite/bin/cbuildbot",
+                "config",
+                "--buildroot",
+                "/root/repository",
+                "--branch",
+                "branch",
+                "--git-cache-dir",
+                "/git-cache",
+                "--cache-dir",
+                "/cache",
+                "--remote-trybot",
+                "--master-build-id",
+                "123456789",
+                "--buildnumber",
+                "314",
+                "--previous-build-state",
+                "eyJicmFuY2giOiJicmFuY2giLCJidWlsZF9udW1iZXIiOjMxMywiYnVpbGRyb290X"
+                "2xheW91dCI6MiwibWFzdGVyX2J1aWxkX2lkIjoxMjMxMjMxMjMsInN0YXR1cyI6Im"
+                "ZhaWwifQ==",
+                "--workspace",
+                "/root/workspace",
+                "--cache-dir",
+                "/cache",
+            ],
+            extra_env={"PATH": mock.ANY},
+            cwd="/root/repository",
+            check=False,
+        )
 
-    # Ensure we write the final build state, as expected.
-    final_state = build_summary.BuildSummary(
-        build_number=314,
-        master_build_id=123456789,
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branch')
-    self.assertEqual(mock_set_last_build_state.mock_calls, [
-        mock.call('/root', final_state)])
+        # Ensure we write the final build state, as expected.
+        final_state = build_summary.BuildSummary(
+            build_number=314,
+            master_build_id=123456789,
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branch",
+        )
+        self.assertEqual(
+            mock_set_last_build_state.mock_calls,
+            [mock.call("/root", final_state)],
+        )
 
-    # Ensure we clean the chroot, as expected.
-    mock_cleanup_chroot.assert_called_once_with('/root/repository')
+        # Ensure we clean the chroot, as expected.
+        mock_cleanup_chroot.assert_called_once_with("/root/repository")
 
 
 class CleanBuildRootTest(cros_test_lib.MockTempDirTestCase):
-  """Tests for CleanBuildRoot method."""
+    """Tests for CleanBuildRoot method."""
 
-  def setUp(self):
-    """Create standard buildroot contents for cleanup."""
-    self.root = os.path.join(self.tempdir)
-    self.previous_build_state = os.path.join(
-        self.root, '.cbuildbot_build_state.json')
-    self.buildroot = os.path.join(self.root, 'buildroot')
-    self.repo = os.path.join(self.buildroot, '.repo/repo')
-    self.chroot = os.path.join(self.buildroot, 'chroot')
-    self.general = os.path.join(self.buildroot, 'general/general')
-    self.cache = os.path.join(self.buildroot, '.cache')
-    self.distfiles = os.path.join(self.cache, 'distfiles')
+    def setUp(self):
+        """Create standard buildroot contents for cleanup."""
+        self.root = os.path.join(self.tempdir)
+        self.previous_build_state = os.path.join(
+            self.root, ".cbuildbot_build_state.json"
+        )
+        self.buildroot = os.path.join(self.root, "buildroot")
+        self.repo = os.path.join(self.buildroot, ".repo/repo")
+        self.chroot = os.path.join(self.buildroot, "chroot")
+        self.general = os.path.join(self.buildroot, "general/general")
+        self.cache = os.path.join(self.buildroot, ".cache")
+        self.distfiles = os.path.join(self.cache, "distfiles")
 
-    self.mock_repo = mock.Mock(repository.RepoRepository)
-    self.mock_repo.directory = self.buildroot
+        self.mock_repo = mock.Mock(repository.RepoRepository)
+        self.mock_repo.directory = self.buildroot
 
-  def populateBuildroot(self, previous_build_state=None):
-    """Create standard buildroot contents for cleanup."""
-    if previous_build_state:
-      osutils.SafeMakedirs(self.root)
-      osutils.WriteFile(self.previous_build_state, previous_build_state)
+    def populateBuildroot(self, previous_build_state=None):
+        """Create standard buildroot contents for cleanup."""
+        if previous_build_state:
+            osutils.SafeMakedirs(self.root)
+            osutils.WriteFile(self.previous_build_state, previous_build_state)
 
-    # Create files.
-    for f in (self.repo, self.chroot, self.general, self.distfiles):
-      osutils.Touch(f, makedirs=True)
+        # Create files.
+        for f in (self.repo, self.chroot, self.general, self.distfiles):
+            osutils.Touch(f, makedirs=True)
 
-  def testNoBuildroot(self):
-    """Test CleanBuildRoot with no history."""
-    self.mock_repo.branch = 'main'
+    def testNoBuildroot(self):
+        """Test CleanBuildRoot with no history."""
+        self.mock_repo.branch = "main"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='main')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="main",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'main')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "main")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertExists(self.previous_build_state)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootNoState(self):
-    """Test CleanBuildRoot with no state information."""
-    self.populateBuildroot()
-    self.mock_repo.branch = 'main'
+    def testBuildrootNoState(self):
+        """Test CleanBuildRoot with no state information."""
+        self.populateBuildroot()
+        self.mock_repo.branch = "main"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='main')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="main",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'main')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "main")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertNotExists(self.repo)
-    self.assertNotExists(self.chroot)
-    self.assertNotExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertNotExists(self.repo)
+        self.assertNotExists(self.chroot)
+        self.assertNotExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootFormatMismatch(self):
-    """Test CleanBuildRoot with buildroot layout mismatch."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=1,
-        branch='main')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'main'
+    def testBuildrootFormatMismatch(self):
+        """Test CleanBuildRoot with buildroot layout mismatch."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=1,
+            branch="main",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "main"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='main')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="main",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'main')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "main")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertNotExists(self.repo)
-    self.assertNotExists(self.chroot)
-    self.assertNotExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertNotExists(self.repo)
+        self.assertNotExists(self.chroot)
+        self.assertNotExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootBranchChange(self):
-    """Test CleanBuildRoot with a change in branches."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchB'
-    m = self.PatchObject(cros_sdk_lib, 'CleanupChrootMount')
+    def testBuildrootBranchChange(self):
+        """Test CleanBuildRoot with a change in branches."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchB"
+        m = self.PatchObject(cros_sdk_lib, "CleanupChrootMount")
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchB')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchB",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchB')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchB")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    # self.assertExists(self.repo)
-    self.assertExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
-    m.assert_called_with(self.chroot, delete=True)
+        # self.assertExists(self.repo)
+        self.assertExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
+        m.assert_called_with(self.chroot, delete=True)
 
-  def testBuildrootBranchMatch(self):
-    """Test CleanBuildRoot with no change in branch."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testBuildrootBranchMatch(self):
+        """Test CleanBuildRoot with no change in branch."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchA')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchA")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertExists(self.repo)
-    self.assertExists(self.chroot)
-    self.assertExists(self.general)
-    self.assertExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertExists(self.repo)
+        self.assertExists(self.chroot)
+        self.assertExists(self.general)
+        self.assertExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootGitLocksPrevPass(self):
-    """Verify not CleanStaleLocks, if previous build was in passed."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testBuildrootGitLocksPrevPass(self):
+        """Verify not CleanStaleLocks, if previous build was in passed."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    self.assertEqual(
-        self.mock_repo.mock_calls, [
-            mock.call.PreLoad(),
-            mock.call.BuildRootGitCleanup(prune_all=True),
-        ])
+        self.assertEqual(
+            self.mock_repo.mock_calls,
+            [
+                mock.call.PreLoad(),
+                mock.call.BuildRootGitCleanup(prune_all=True),
+            ],
+        )
 
-  def testBuildrootGitLocksPrevFail(self):
-    """Verify not CleanStaleLocks, if previous build was in failed."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_FAILED,
-        buildroot_layout=2,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testBuildrootGitLocksPrevFail(self):
+        """Verify not CleanStaleLocks, if previous build was in failed."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_FAILED,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    self.assertEqual(
-        self.mock_repo.mock_calls, [
-            mock.call.PreLoad(),
-            mock.call.BuildRootGitCleanup(prune_all=True),
-        ])
+        self.assertEqual(
+            self.mock_repo.mock_calls,
+            [
+                mock.call.PreLoad(),
+                mock.call.BuildRootGitCleanup(prune_all=True),
+            ],
+        )
 
-  def testBuildrootGitLocksPrevInFlight(self):
-    """Verify CleanStaleLocks, if previous build was in flight."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=2,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testBuildrootGitLocksPrevInFlight(self):
+        """Verify CleanStaleLocks, if previous build was in flight."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
+        self.assertEqual(
+            self.mock_repo.method_calls,
+            [
+                mock.call.PreLoad(),
+                mock.call.CleanStaleLocks(),
+                mock.call.BuildRootGitCleanup(prune_all=True),
+            ],
+        )
 
-    self.assertEqual(
-        self.mock_repo.method_calls, [
-            mock.call.PreLoad(),
-            mock.call.CleanStaleLocks(),
-            mock.call.BuildRootGitCleanup(prune_all=True),
-        ])
+    def testBuildrootDistfilesRecentCache(self):
+        """Test CleanBuildRoot does not delete distfiles when cache is recent."""
+        seed_distfiles_ts = time.time() - 60
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+            distfiles_ts=seed_distfiles_ts,
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-  def testBuildrootDistfilesRecentCache(self):
-    """Test CleanBuildRoot does not delete distfiles when cache is recent."""
-    seed_distfiles_ts = time.time() - 60
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA',
-        distfiles_ts=seed_distfiles_ts)
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
-
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchA')
-    # Same cache creation timestamp is rewritten to state.
-    self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchA")
+        # Same cache creation timestamp is rewritten to state.
+        self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertExists(self.repo)
-    self.assertExists(self.chroot)
-    self.assertExists(self.general)
-    self.assertExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertExists(self.repo)
+        self.assertExists(self.chroot)
+        self.assertExists(self.general)
+        self.assertExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootDistfilesCacheExpired(self):
-    """Test CleanBuildRoot when the distfiles cache is too old."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA',
-        distfiles_ts=100.0)
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testBuildrootDistfilesCacheExpired(self):
+        """Test CleanBuildRoot when the distfiles cache is too old."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+            distfiles_ts=100.0,
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchA')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchA")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertExists(self.repo)
-    self.assertExists(self.chroot)
-    self.assertExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertExists(self.repo)
+        self.assertExists(self.chroot)
+        self.assertExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testRootOwnedCache(self):
-    """Test CleanBuildRoot with no history."""
-    seed_distfiles_ts = time.time() - 60
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=2,
-        branch='branchA',
-        distfiles_ts=seed_distfiles_ts)
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
+    def testRootOwnedCache(self):
+        """Test CleanBuildRoot with no history."""
+        seed_distfiles_ts = time.time() - 60
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=2,
+            branch="branchA",
+            distfiles_ts=seed_distfiles_ts,
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
 
-    osutils.Chown(self.cache, 'root', 'root')
+        osutils.Chown(self.cache, "root", "root")
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchA')
-    # Same cache creation timestamp is rewritten to state.
-    self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchA")
+        # Same cache creation timestamp is rewritten to state.
+        self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertExists(self.repo)
-    self.assertExists(self.chroot)
-    self.assertExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertExists(self.repo)
+        self.assertExists(self.chroot)
+        self.assertExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testBuildrootRepoCleanFailure(self):
-    """Test CleanBuildRoot with repo checkout failure."""
-    old_build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_PASSED,
-        buildroot_layout=1,
-        branch='branchA')
-    self.populateBuildroot(previous_build_state=old_build_state.to_json())
-    self.mock_repo.branch = 'branchA'
-    self.mock_repo.BuildRootGitCleanup.side_effect = Exception
+    def testBuildrootRepoCleanFailure(self):
+        """Test CleanBuildRoot with repo checkout failure."""
+        old_build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_PASSED,
+            buildroot_layout=1,
+            branch="branchA",
+        )
+        self.populateBuildroot(previous_build_state=old_build_state.to_json())
+        self.mock_repo.branch = "branchA"
+        self.mock_repo.BuildRootGitCleanup.side_effect = Exception
 
-    build_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
-        branch='branchA')
-    cbuildbot_launch.CleanBuildRoot(
-        self.root, self.mock_repo, self.cache, build_state)
+        build_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
+            branch="branchA",
+        )
+        cbuildbot_launch.CleanBuildRoot(
+            self.root, self.mock_repo, self.cache, build_state
+        )
 
-    new_summary = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(new_summary.buildroot_layout, 2)
-    self.assertEqual(new_summary.branch, 'branchA')
-    self.assertIsNotNone(new_summary.distfiles_ts)
-    self.assertEqual(new_summary, build_state)
+        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(new_summary.buildroot_layout, 2)
+        self.assertEqual(new_summary.branch, "branchA")
+        self.assertIsNotNone(new_summary.distfiles_ts)
+        self.assertEqual(new_summary, build_state)
 
-    self.assertNotExists(self.repo)
-    self.assertNotExists(self.chroot)
-    self.assertNotExists(self.general)
-    self.assertNotExists(self.distfiles)
-    self.assertExists(self.previous_build_state)
+        self.assertNotExists(self.repo)
+        self.assertNotExists(self.chroot)
+        self.assertNotExists(self.general)
+        self.assertNotExists(self.distfiles)
+        self.assertExists(self.previous_build_state)
 
-  def testGetCurrentBuildStateNoArgs(self):
-    """Tests GetCurrentBuildState without arguments."""
-    options = cbuildbot_launch.PreParseArguments([
-        '--buildroot', self.root, 'config'
-    ])
-    state = cbuildbot_launch.GetCurrentBuildState(options, 'main')
+    def testGetCurrentBuildStateNoArgs(self):
+        """Tests GetCurrentBuildState without arguments."""
+        options = cbuildbot_launch.PreParseArguments(
+            ["--buildroot", self.root, "config"]
+        )
+        state = cbuildbot_launch.GetCurrentBuildState(options, "main")
 
-    expected_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=2,
-        branch='main')
-    self.assertEqual(state, expected_state)
+        expected_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=2,
+            branch="main",
+        )
+        self.assertEqual(state, expected_state)
 
-  def testGetCurrentBuildStateHasArgs(self):
-    """Tests GetCurrentBuildState with arguments."""
-    options = cbuildbot_launch.PreParseArguments([
-        '--buildroot', self.root,
-        '--buildnumber', '20',
-        '--master-build-id', '50',
-        'config'
-    ])
-    state = cbuildbot_launch.GetCurrentBuildState(options, 'branchA')
+    def testGetCurrentBuildStateHasArgs(self):
+        """Tests GetCurrentBuildState with arguments."""
+        options = cbuildbot_launch.PreParseArguments(
+            [
+                "--buildroot",
+                self.root,
+                "--buildnumber",
+                "20",
+                "--master-build-id",
+                "50",
+                "config",
+            ]
+        )
+        state = cbuildbot_launch.GetCurrentBuildState(options, "branchA")
 
-    expected_state = build_summary.BuildSummary(
-        build_number=20,
-        master_build_id=50,
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=2,
-        branch='branchA')
-    self.assertEqual(state, expected_state)
+        expected_state = build_summary.BuildSummary(
+            build_number=20,
+            master_build_id=50,
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=2,
+            branch="branchA",
+        )
+        self.assertEqual(state, expected_state)
 
-  def testGetCurrentBuildStateLayout(self):
-    """Test that GetCurrentBuildState uses the current buildroot layout."""
-    # Change to a future version.
-    self.PatchObject(cbuildbot_launch, 'BUILDROOT_BUILDROOT_LAYOUT', 22)
+    def testGetCurrentBuildStateLayout(self):
+        """Test that GetCurrentBuildState uses the current buildroot layout."""
+        # Change to a future version.
+        self.PatchObject(cbuildbot_launch, "BUILDROOT_BUILDROOT_LAYOUT", 22)
 
-    options = cbuildbot_launch.PreParseArguments([
-        '--buildroot', self.root, 'config'
-    ])
-    state = cbuildbot_launch.GetCurrentBuildState(options, 'branchA')
+        options = cbuildbot_launch.PreParseArguments(
+            ["--buildroot", self.root, "config"]
+        )
+        state = cbuildbot_launch.GetCurrentBuildState(options, "branchA")
 
-    expected_state = build_summary.BuildSummary(
-        status=constants.BUILDER_STATUS_INFLIGHT,
-        buildroot_layout=22,
-        branch='branchA')
-    self.assertEqual(state, expected_state)
+        expected_state = build_summary.BuildSummary(
+            status=constants.BUILDER_STATUS_INFLIGHT,
+            buildroot_layout=22,
+            branch="branchA",
+        )
+        self.assertEqual(state, expected_state)
 
-  def testGetLastBuildStateNoFile(self):
-    """Tests GetLastBuildState if the file is missing."""
-    osutils.SafeMakedirs(self.root)
-    state = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(state, build_summary.BuildSummary())
+    def testGetLastBuildStateNoFile(self):
+        """Tests GetLastBuildState if the file is missing."""
+        osutils.SafeMakedirs(self.root)
+        state = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(state, build_summary.BuildSummary())
 
-  def testGetLastBuildStateBadFile(self):
-    """Tests GetLastBuildState if the file contains invalid JSON."""
-    osutils.SafeMakedirs(self.root)
-    osutils.WriteFile(self.previous_build_state, '}}')
-    state = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(state, build_summary.BuildSummary())
+    def testGetLastBuildStateBadFile(self):
+        """Tests GetLastBuildState if the file contains invalid JSON."""
+        osutils.SafeMakedirs(self.root)
+        osutils.WriteFile(self.previous_build_state, "}}")
+        state = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(state, build_summary.BuildSummary())
 
-  def testGetLastBuildStateMissingBuildStatus(self):
-    """Tests GetLastBuildState if the file doesn't have a valid status."""
-    osutils.SafeMakedirs(self.root)
-    osutils.WriteFile(self.previous_build_state, '{"build_number": "3"}')
-    state = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(state, build_summary.BuildSummary())
+    def testGetLastBuildStateMissingBuildStatus(self):
+        """Tests GetLastBuildState if the file doesn't have a valid status."""
+        osutils.SafeMakedirs(self.root)
+        osutils.WriteFile(self.previous_build_state, '{"build_number": "3"}')
+        state = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(state, build_summary.BuildSummary())
 
-  def testGetLastBuildStateGoodFile(self):
-    """Tests GetLastBuildState on a good file."""
-    osutils.SafeMakedirs(self.root)
-    osutils.WriteFile(
-        self.previous_build_state,
-        '{"build_number": 1, "master_build_id": 3, "status": "pass"}')
-    state = cbuildbot_launch.GetLastBuildState(self.root)
-    self.assertEqual(
-        state,
-        build_summary.BuildSummary(
-            build_number=1, master_build_id=3, status='pass'))
+    def testGetLastBuildStateGoodFile(self):
+        """Tests GetLastBuildState on a good file."""
+        osutils.SafeMakedirs(self.root)
+        osutils.WriteFile(
+            self.previous_build_state,
+            '{"build_number": 1, "master_build_id": 3, "status": "pass"}',
+        )
+        state = cbuildbot_launch.GetLastBuildState(self.root)
+        self.assertEqual(
+            state,
+            build_summary.BuildSummary(
+                build_number=1, master_build_id=3, status="pass"
+            ),
+        )
 
-  def testSetLastBuildState(self):
-    """Verifies that SetLastBuildState writes to the expected file."""
-    osutils.SafeMakedirs(self.root)
-    old_state = build_summary.BuildSummary(
-        build_number=314,
-        master_build_id=2178,
-        status=constants.BUILDER_STATUS_PASSED)
-    cbuildbot_launch.SetLastBuildState(self.root, old_state)
+    def testSetLastBuildState(self):
+        """Verifies that SetLastBuildState writes to the expected file."""
+        osutils.SafeMakedirs(self.root)
+        old_state = build_summary.BuildSummary(
+            build_number=314,
+            master_build_id=2178,
+            status=constants.BUILDER_STATUS_PASSED,
+        )
+        cbuildbot_launch.SetLastBuildState(self.root, old_state)
 
-    saved_state = osutils.ReadFile(self.previous_build_state)
-    new_state = build_summary.BuildSummary()
-    new_state.from_json(saved_state)
+        saved_state = osutils.ReadFile(self.previous_build_state)
+        new_state = build_summary.BuildSummary()
+        new_state.from_json(saved_state)
 
-    self.assertEqual(old_state, new_state)
+        self.assertEqual(old_state, new_state)
 
-  def testCleanupChrootNoChroot(self):
-    """Check CleanupChroot without a chroot."""
-    self.StartPatcher(cros_test_lib.RunCommandMock())
-    with mock.patch.object(cros_sdk_lib, 'CleanupChrootMount'):
-      cbuildbot_launch.CleanupChroot(self.buildroot)
+    def testCleanupChrootNoChroot(self):
+        """Check CleanupChroot without a chroot."""
+        self.StartPatcher(cros_test_lib.RunCommandMock())
+        with mock.patch.object(cros_sdk_lib, "CleanupChrootMount"):
+            cbuildbot_launch.CleanupChroot(self.buildroot)
 
-  def testCleanupChrootNormal(self):
-    """Check normal CleanupChroot."""
-    osutils.SafeMakedirs(self.chroot)
-    osutils.Touch(self.chroot + '.img')
-    self.StartPatcher(cros_test_lib.RunCommandMock())
-    with mock.patch.object(cros_sdk_lib, 'CleanupChrootMount'):
-      cbuildbot_launch.CleanupChroot(self.buildroot)
+    def testCleanupChrootNormal(self):
+        """Check normal CleanupChroot."""
+        osutils.SafeMakedirs(self.chroot)
+        osutils.Touch(self.chroot + ".img")
+        self.StartPatcher(cros_test_lib.RunCommandMock())
+        with mock.patch.object(cros_sdk_lib, "CleanupChrootMount"):
+            cbuildbot_launch.CleanupChroot(self.buildroot)
 
-  def testCleanupChrootTimeout(self):
-    """Check timeouts in CleanupChroot."""
-    osutils.SafeMakedirs(self.chroot)
-    osutils.Touch(self.chroot + '.img')
-    rc_mock = self.StartPatcher(cros_test_lib.RunCommandMock())
-    rc_mock.SetDefaultCmdResult()
-    with mock.patch.object(cros_sdk_lib, 'CleanupChrootMount',
-                           side_effect=timeout_util.TimeoutError):
-      cbuildbot_launch.CleanupChroot(self.buildroot)
+    def testCleanupChrootTimeout(self):
+        """Check timeouts in CleanupChroot."""
+        osutils.SafeMakedirs(self.chroot)
+        osutils.Touch(self.chroot + ".img")
+        rc_mock = self.StartPatcher(cros_test_lib.RunCommandMock())
+        rc_mock.SetDefaultCmdResult()
+        with mock.patch.object(
+            cros_sdk_lib,
+            "CleanupChrootMount",
+            side_effect=timeout_util.TimeoutError,
+        ):
+            cbuildbot_launch.CleanupChroot(self.buildroot)