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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/api/validate_unittest.py b/api/validate_unittest.py
index 6f15a10..2a8f414 100644
--- a/api/validate_unittest.py
+++ b/api/validate_unittest.py
@@ -23,511 +23,548 @@
 # we'd usually expect in a controller is not required. The validator
 # just needs to be checking one of the fields on the message being used.
 class ExistsTest(cros_test_lib.TempDirTestCase, api_config.ApiConfigMixin):
-  """Tests for the exists validator."""
+    """Tests for the exists validator."""
 
-  def test_not_exists(self):
-    """Test the validator fails when given a path that doesn't exist."""
-    path = os.path.join(self.tempdir, 'DOES_NOT_EXIST')
+    def test_not_exists(self):
+        """Test the validator fails when given a path that doesn't exist."""
+        path = os.path.join(self.tempdir, "DOES_NOT_EXIST")
 
-    @validate.exists('path')
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.exists("path")
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(path=path), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(path=path), None, self.api_config)
 
-  def test_exists(self):
-    """Test the validator fails when given a path that doesn't exist."""
-    path = os.path.join(self.tempdir, 'chroot')
-    osutils.SafeMakedirs(path)
+    def test_exists(self):
+        """Test the validator fails when given a path that doesn't exist."""
+        path = os.path.join(self.tempdir, "chroot")
+        osutils.SafeMakedirs(path)
 
-    @validate.exists('path')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.exists("path")
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(common_pb2.Chroot(path=path), None, self.api_config)
+        impl(common_pb2.Chroot(path=path), None, self.api_config)
 
-  def test_skip_validation(self):
-    """Test skipping validation case."""
-    @validate.exists('path')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+    def test_skip_validation(self):
+        """Test skipping validation case."""
 
-    # This would otherwise raise an error for an invalid path.
-    impl(common_pb2.Chroot(), None, self.no_validate_config)
+        @validate.exists("path")
+        def impl(_input_proto, _output_proto, _config):
+            pass
+
+        # This would otherwise raise an error for an invalid path.
+        impl(common_pb2.Chroot(), None, self.no_validate_config)
 
 
 class IsInTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """Tests for the is_in validator."""
+    """Tests for the is_in validator."""
 
-  def test_in(self):
-    """Test a valid value."""
-    @validate.is_in('path', ['/chroot/path', '/other/chroot/path'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+    def test_in(self):
+        """Test a valid value."""
 
-    # Make sure all of the values work.
-    impl(common_pb2.Chroot(path='/chroot/path'), None, self.api_config)
-    impl(common_pb2.Chroot(path='/other/chroot/path'), None, self.api_config)
+        @validate.is_in("path", ["/chroot/path", "/other/chroot/path"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-  def test_not_in(self):
-    """Test an invalid value."""
-    @validate.is_in('path', ['/chroot/path', '/other/chroot/path'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        # Make sure all of the values work.
+        impl(common_pb2.Chroot(path="/chroot/path"), None, self.api_config)
+        impl(
+            common_pb2.Chroot(path="/other/chroot/path"), None, self.api_config
+        )
 
-    # Should be failing on the invalid value.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(path='/bad/value'), None, self.api_config)
+    def test_not_in(self):
+        """Test an invalid value."""
 
-  def test_not_set(self):
-    """Test an unset value."""
-    @validate.is_in('path', ['/chroot/path', '/other/chroot/path'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.is_in("path", ["/chroot/path", "/other/chroot/path"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # Should be failing without a value set.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(), None, self.api_config)
+        # Should be failing on the invalid value.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(path="/bad/value"), None, self.api_config)
 
-  def test_skip_validation(self):
-    """Test skipping validation case."""
-    @validate.is_in('path', ['/chroot/path', '/other/chroot/path'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+    def test_not_set(self):
+        """Test an unset value."""
 
-    # This would otherwise raise an error for an invalid path.
-    impl(common_pb2.Chroot(), None, self.no_validate_config)
+        @validate.is_in("path", ["/chroot/path", "/other/chroot/path"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
+
+        # Should be failing without a value set.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(), None, self.api_config)
+
+    def test_skip_validation(self):
+        """Test skipping validation case."""
+
+        @validate.is_in("path", ["/chroot/path", "/other/chroot/path"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
+
+        # This would otherwise raise an error for an invalid path.
+        impl(common_pb2.Chroot(), None, self.no_validate_config)
 
 
 class EachInTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """Tests for the each_in validator."""
+    """Tests for the each_in validator."""
 
-  # Easier access to the enum values.
-  ENUM_FOO = build_api_test_pb2.TEST_ENUM_FOO
-  ENUM_BAR = build_api_test_pb2.TEST_ENUM_BAR
-  ENUM_BAZ = build_api_test_pb2.TEST_ENUM_BAZ
+    # Easier access to the enum values.
+    ENUM_FOO = build_api_test_pb2.TEST_ENUM_FOO
+    ENUM_BAR = build_api_test_pb2.TEST_ENUM_BAR
+    ENUM_BAZ = build_api_test_pb2.TEST_ENUM_BAZ
 
-  # pylint: disable=docstring-misnamed-args
-  def _message_request(self, *messages):
-    """Build a request instance, filling out the messages field.
+    # pylint: disable=docstring-misnamed-args
+    def _message_request(self, *messages):
+        """Build a request instance, filling out the messages field.
 
-    Args:
-      messages: Each messages data (id, name, flag, enum) as lists. Only
-        requires as many as are set. e.g. _request([1], [2]) will create two
-        messages with only ids set. _request([1, 'name']) will create one with
-        id and name set, but not flag or enum.
-    """
-    request = build_api_test_pb2.TestRequestMessage()
-    for message in messages or []:
-      msg = request.messages.add()
-      try:
-        msg.id = message[0]
-        msg.name = message[1]
-        msg.flag = message[2]
-      except IndexError:
-        pass
+        Args:
+          messages: Each messages data (id, name, flag, enum) as lists. Only
+            requires as many as are set. e.g. _request([1], [2]) will create two
+            messages with only ids set. _request([1, 'name']) will create one with
+            id and name set, but not flag or enum.
+        """
+        request = build_api_test_pb2.TestRequestMessage()
+        for message in messages or []:
+            msg = request.messages.add()
+            try:
+                msg.id = message[0]
+                msg.name = message[1]
+                msg.flag = message[2]
+            except IndexError:
+                pass
 
-    return request
+        return request
 
-  def _enums_request(self, *enum_values):
-    """Build a request instance, setting the test_enums field."""
-    request = build_api_test_pb2.TestRequestMessage()
-    for value in enum_values:
-      request.test_enums.append(value)
+    def _enums_request(self, *enum_values):
+        """Build a request instance, setting the test_enums field."""
+        request = build_api_test_pb2.TestRequestMessage()
+        for value in enum_values:
+            request.test_enums.append(value)
 
-    return request
+        return request
 
-  def _numbers_request(self, *numbers):
-    """Build a request instance, setting the numbers field."""
-    request = build_api_test_pb2.TestRequestMessage()
-    request.numbers.extend(numbers)
+    def _numbers_request(self, *numbers):
+        """Build a request instance, setting the numbers field."""
+        request = build_api_test_pb2.TestRequestMessage()
+        request.numbers.extend(numbers)
 
-    return request
+        return request
 
-  def test_message_in(self):
-    """Test valid values."""
+    def test_message_in(self):
+        """Test valid values."""
 
-    @validate.each_in('messages', 'name', ['foo', 'bar'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("messages", "name", ["foo", "bar"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(self._message_request([1, 'foo']), None, self.api_config)
-    impl(self._message_request([1, 'foo'], [2, 'bar']), None, self.api_config)
+        impl(self._message_request([1, "foo"]), None, self.api_config)
+        impl(
+            self._message_request([1, "foo"], [2, "bar"]), None, self.api_config
+        )
 
-  def test_enum_in(self):
-    """Test valid enum values."""
+    def test_enum_in(self):
+        """Test valid enum values."""
 
-    @validate.each_in('test_enums', None, [self.ENUM_FOO, self.ENUM_BAR])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("test_enums", None, [self.ENUM_FOO, self.ENUM_BAR])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(self._enums_request(self.ENUM_FOO), None, self.api_config)
-    impl(self._enums_request(self.ENUM_FOO, self.ENUM_BAR), None,
-         self.api_config)
+        impl(self._enums_request(self.ENUM_FOO), None, self.api_config)
+        impl(
+            self._enums_request(self.ENUM_FOO, self.ENUM_BAR),
+            None,
+            self.api_config,
+        )
 
-  def test_scalar_in(self):
-    """Test valid scalar values."""
+    def test_scalar_in(self):
+        """Test valid scalar values."""
 
-    @validate.each_in('numbers', None, [1, 2])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("numbers", None, [1, 2])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(self._numbers_request(1), None, self.api_config)
-    impl(self._numbers_request(1, 2), None, self.api_config)
+        impl(self._numbers_request(1), None, self.api_config)
+        impl(self._numbers_request(1, 2), None, self.api_config)
 
-  def test_message_not_in(self):
-    """Test an invalid value."""
+    def test_message_not_in(self):
+        """Test an invalid value."""
 
-    @validate.each_in('messages', 'name', ['foo', 'bar'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("messages", "name", ["foo", "bar"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # Should be failing on the invalid value.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1, 'invalid']), None, self.api_config)
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1, 'invalid'], [2, 'invalid']), None,
-           self.api_config)
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1, 'foo'], [2, 'invalid']), None,
-           self.api_config)
+        # Should be failing on the invalid value.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1, "invalid"]), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(
+                self._message_request([1, "invalid"], [2, "invalid"]),
+                None,
+                self.api_config,
+            )
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(
+                self._message_request([1, "foo"], [2, "invalid"]),
+                None,
+                self.api_config,
+            )
 
-  def test_enum_not_in(self):
-    """Test an invalid enum value."""
+    def test_enum_not_in(self):
+        """Test an invalid enum value."""
 
-    @validate.each_in('test_enums', None, [self.ENUM_FOO, self.ENUM_BAR])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("test_enums", None, [self.ENUM_FOO, self.ENUM_BAR])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # Only invalid values.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._enums_request(self.ENUM_BAZ), None, self.api_config)
-    # Mixed valid/invalid values.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._enums_request(self.ENUM_FOO, self.ENUM_BAZ), None,
-           self.api_config)
+        # Only invalid values.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._enums_request(self.ENUM_BAZ), None, self.api_config)
+        # Mixed valid/invalid values.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(
+                self._enums_request(self.ENUM_FOO, self.ENUM_BAZ),
+                None,
+                self.api_config,
+            )
 
-  def test_scalar_not_in(self):
-    """Test invalid scalar value."""
+    def test_scalar_not_in(self):
+        """Test invalid scalar value."""
 
-    @validate.each_in('numbers', None, [1, 2])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("numbers", None, [1, 2])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # Only invalid values.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._numbers_request(3), None, self.api_config)
-    # Mixed valid/invalid values.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._numbers_request(1, 2, 3), None, self.api_config)
+        # Only invalid values.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._numbers_request(3), None, self.api_config)
+        # Mixed valid/invalid values.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._numbers_request(1, 2, 3), None, self.api_config)
 
-  def test_not_set(self):
-    """Test an unset value."""
+    def test_not_set(self):
+        """Test an unset value."""
 
-    @validate.each_in('messages', 'name', ['foo', 'bar'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("messages", "name", ["foo", "bar"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # Should be failing without a value set.
-    # No entries in the field.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request(), None, self.api_config)
-    # No value set on lone entry.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1]), None, self.api_config)
-    # No value set on multiple entries.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1], [2]), None, self.api_config)
-    # Some valid and some invalid entries.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1, 'foo'], [2]), None, self.api_config)
+        # Should be failing without a value set.
+        # No entries in the field.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request(), None, self.api_config)
+        # No value set on lone entry.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1]), None, self.api_config)
+        # No value set on multiple entries.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1], [2]), None, self.api_config)
+        # Some valid and some invalid entries.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1, "foo"], [2]), None, self.api_config)
 
-  def test_optional(self):
-    """Test optional argument."""
+    def test_optional(self):
+        """Test optional argument."""
 
-    @validate.each_in('messages', 'name', ['foo', 'bar'], optional=True)
-    @validate.each_in('test_enums', None, [self.ENUM_FOO, self.ENUM_BAR],
-                      optional=True)
-    @validate.each_in('numbers', None, [1, 2], optional=True)
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("messages", "name", ["foo", "bar"], optional=True)
+        @validate.each_in(
+            "test_enums", None, [self.ENUM_FOO, self.ENUM_BAR], optional=True
+        )
+        @validate.each_in("numbers", None, [1, 2], optional=True)
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # No entries in the field succeeds.
-    impl(self._message_request(), None, self.api_config)
+        # No entries in the field succeeds.
+        impl(self._message_request(), None, self.api_config)
 
-    # Still fails when entries exist but value unset cases.
-    # No value set on lone entry.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1]), None, self.api_config)
-    # No value set on multiple entries.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1], [2]), None, self.api_config)
-    # Some valid and some invalid entries.
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._message_request([1, 'foo'], [2]), None, self.api_config)
+        # Still fails when entries exist but value unset cases.
+        # No value set on lone entry.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1]), None, self.api_config)
+        # No value set on multiple entries.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1], [2]), None, self.api_config)
+        # Some valid and some invalid entries.
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._message_request([1, "foo"], [2]), None, self.api_config)
 
-  def test_skip_validation(self):
-    """Test skipping validation case."""
+    def test_skip_validation(self):
+        """Test skipping validation case."""
 
-    @validate.each_in('messages', 'name', ['foo', 'bar'])
-    @validate.each_in('test_enums', None, [self.ENUM_FOO, self.ENUM_BAR])
-    @validate.each_in('numbers', None, [1, 2])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.each_in("messages", "name", ["foo", "bar"])
+        @validate.each_in("test_enums", None, [self.ENUM_FOO, self.ENUM_BAR])
+        @validate.each_in("numbers", None, [1, 2])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    # This would otherwise raise an error for multiple invalid fields.
-    impl(self._message_request([1, 'invalid']), None, self.no_validate_config)
+        # This would otherwise raise an error for multiple invalid fields.
+        impl(
+            self._message_request([1, "invalid"]), None, self.no_validate_config
+        )
 
 
 class RequireTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """Tests for the require validator."""
+    """Tests for the require validator."""
 
-  def test_invalid_field(self):
-    """Test validator fails when given an unset value."""
+    def test_invalid_field(self):
+        """Test validator fails when given an unset value."""
 
-    @validate.require('does.not.exist')
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.require("does.not.exist")
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(), None, self.api_config)
 
-  def test_not_set(self):
-    """Test validator fails when given an unset value."""
+    def test_not_set(self):
+        """Test validator fails when given an unset value."""
 
-    @validate.require('env.use_flags')
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.require("env.use_flags")
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(), None, self.api_config)
 
-  def test_set(self):
-    """Test validator passes when given set values."""
+    def test_set(self):
+        """Test validator passes when given set values."""
 
-    @validate.require('path', 'env.use_flags')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.require("path", "env.use_flags")
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    in_proto = common_pb2.Chroot(path='/chroot/path',
-                                 env={'use_flags': [{'flag': 'test'}]})
-    impl(in_proto, None, self.api_config)
+        in_proto = common_pb2.Chroot(
+            path="/chroot/path", env={"use_flags": [{"flag": "test"}]}
+        )
+        impl(in_proto, None, self.api_config)
 
-  def test_mixed(self):
-    """Test validator fails when given a set value and an unset value."""
+    def test_mixed(self):
+        """Test validator fails when given a set value and an unset value."""
 
-    @validate.require('path', 'env.use_flags')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.require("path", "env.use_flags")
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(common_pb2.Chroot(path='/chroot/path'), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(common_pb2.Chroot(path="/chroot/path"), None, self.api_config)
 
-  def test_skip_validation(self):
-    """Test skipping validation case."""
-    @validate.require('path', 'env.use_flags')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+    def test_skip_validation(self):
+        """Test skipping validation case."""
 
-    # This would otherwise raise an error for an invalid path.
-    impl(common_pb2.Chroot(), None, self.no_validate_config)
+        @validate.require("path", "env.use_flags")
+        def impl(_input_proto, _output_proto, _config):
+            pass
+
+        # This would otherwise raise an error for an invalid path.
+        impl(common_pb2.Chroot(), None, self.no_validate_config)
 
 
 class RequireAnyTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """Tests for the require_any validator."""
+    """Tests for the require_any validator."""
 
-  def _get_request(self, mid: int = None, name: str = None, flag: bool = None):
-    """Build a request instance from the given data."""
-    request = build_api_test_pb2.MultiFieldMessage()
+    def _get_request(
+        self, mid: int = None, name: str = None, flag: bool = None
+    ):
+        """Build a request instance from the given data."""
+        request = build_api_test_pb2.MultiFieldMessage()
 
-    if mid:
-      request.id = mid
-    if name:
-      request.name = name
-    if flag:
-      request.flag = flag
+        if mid:
+            request.id = mid
+        if name:
+            request.name = name
+        if flag:
+            request.flag = flag
 
-    return request
+        return request
 
-  def test_invalid_field(self):
-    """Test validator fails when given an invalid field."""
+    def test_invalid_field(self):
+        """Test validator fails when given an invalid field."""
 
-    @validate.require_any('does.not.exist', 'also.invalid')
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.require_any("does.not.exist", "also.invalid")
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._get_request(), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._get_request(), None, self.api_config)
 
-  def test_not_set(self):
-    """Test validator fails when given unset values."""
+    def test_not_set(self):
+        """Test validator fails when given unset values."""
 
-    @validate.require_any('id', 'name')
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.require_any("id", "name")
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._get_request(flag=True), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._get_request(flag=True), None, self.api_config)
 
-  def test_set(self):
-    """Test validator passes when given set values."""
+    def test_set(self):
+        """Test validator passes when given set values."""
 
-    @validate.require_any('id', 'name')
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.require_any("id", "name")
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(self._get_request(1), None, self.api_config)
-    impl(self._get_request(name='foo'), None, self.api_config)
-    impl(self._get_request(1, name='foo'), None, self.api_config)
+        impl(self._get_request(1), None, self.api_config)
+        impl(self._get_request(name="foo"), None, self.api_config)
+        impl(self._get_request(1, name="foo"), None, self.api_config)
 
 
 class RequireEachTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """Tests for the require_each validator."""
+    """Tests for the require_each validator."""
 
-  def _multi_field_message(self, msg_id=None, name=None, flag=None):
-    msg = build_api_test_pb2.MultiFieldMessage()
-    if msg_id is not None:
-      msg.id = int(msg_id)
-    if name is not None:
-      msg.name = str(name)
-    if flag is not None:
-      msg.flag = bool(flag)
-    return msg
+    def _multi_field_message(self, msg_id=None, name=None, flag=None):
+        msg = build_api_test_pb2.MultiFieldMessage()
+        if msg_id is not None:
+            msg.id = int(msg_id)
+        if name is not None:
+            msg.name = str(name)
+        if flag is not None:
+            msg.flag = bool(flag)
+        return msg
 
-  def _request(self, messages=None, count=0):
-    """Build the request."""
-    if messages is None:
-      messages = [self._multi_field_message() for _ in range(count)]
+    def _request(self, messages=None, count=0):
+        """Build the request."""
+        if messages is None:
+            messages = [self._multi_field_message() for _ in range(count)]
 
-    request = build_api_test_pb2.TestRequestMessage()
-    for message in messages:
-      msg = request.messages.add()
-      msg.CopyFrom(message)
+        request = build_api_test_pb2.TestRequestMessage()
+        for message in messages:
+            msg = request.messages.add()
+            msg.CopyFrom(message)
 
-    return request
+        return request
 
-  def test_invalid_field(self):
-    """Test validator fails when given an invalid field."""
+    def test_invalid_field(self):
+        """Test validator fails when given an invalid field."""
 
-    @validate.require_each('does.not', ['exist'])
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        @validate.require_each("does.not", ["exist"])
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._request(), None, self.api_config)
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._request(), None, self.api_config)
 
-  def test_invalid_call_no_subfields(self):
-    """Test validator fails when given no subfields."""
+    def test_invalid_call_no_subfields(self):
+        """Test validator fails when given no subfields."""
 
-    with self.assertRaises(AssertionError):
-      @validate.require_each('does.not', [])
-      def _(_input_proto, _output_proto, _config):
-        pass
+        with self.assertRaises(AssertionError):
 
-  def test_invalid_call_invalid_subfields(self):
-    """Test validator fails when given subfields incorrectly."""
+            @validate.require_each("does.not", [])
+            def _(_input_proto, _output_proto, _config):
+                pass
 
-    with self.assertRaises(AssertionError):
-      @validate.require_each('does.not', 'exist')
-      def _(_input_proto, _output_proto, _config):
-        pass
+    def test_invalid_call_invalid_subfields(self):
+        """Test validator fails when given subfields incorrectly."""
 
-  def test_not_set(self):
-    """Test validator fails when given an unset value."""
+        with self.assertRaises(AssertionError):
 
-    @validate.require_each('messages', ['id'])
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+            @validate.require_each("does.not", "exist")
+            def _(_input_proto, _output_proto, _config):
+                pass
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._request(count=2), None, self.api_config)
+    def test_not_set(self):
+        """Test validator fails when given an unset value."""
 
-  def test_no_elements_success(self):
-    """Test validator fails when given no messages in the repeated field."""
+        @validate.require_each("messages", ["id"])
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    @validate.require_each('messages', ['id'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._request(count=2), None, self.api_config)
 
-    impl(self._request(), None, self.api_config)
+    def test_no_elements_success(self):
+        """Test validator fails when given no messages in the repeated field."""
 
-  def test_no_elements_failure(self):
-    """Test validator fails when given no messages in the repeated field."""
+        @validate.require_each("messages", ["id"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    @validate.require_each('messages', ['id'], allow_empty=False)
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        impl(self._request(), None, self.api_config)
 
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._request(), None, self.api_config)
+    def test_no_elements_failure(self):
+        """Test validator fails when given no messages in the repeated field."""
 
-  def test_set(self):
-    """Test validator passes when given set values."""
+        @validate.require_each("messages", ["id"], allow_empty=False)
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
 
-    @validate.require_each('messages', ['id'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._request(), None, self.api_config)
 
-    messages = [self._multi_field_message(msg_id=i) for i in range(1, 5)]
-    impl(self._request(messages=messages), None, self.api_config)
+    def test_set(self):
+        """Test validator passes when given set values."""
 
-  def test_one_set_fails(self):
-    """Test validator passes when given set values."""
+        @validate.require_each("messages", ["id"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    @validate.require_each('messages', ['id', 'name'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        messages = [self._multi_field_message(msg_id=i) for i in range(1, 5)]
+        impl(self._request(messages=messages), None, self.api_config)
 
-    messages = [self._multi_field_message(msg_id=i) for i in range(1, 5)]
-    with self.assertRaises(cros_build_lib.DieSystemExit):
-      impl(self._request(messages=messages), None, self.api_config)
+    def test_one_set_fails(self):
+        """Test validator passes when given set values."""
 
-  def test_multi_set(self):
-    """Test validator passes when all values set."""
+        @validate.require_each("messages", ["id", "name"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    @validate.require_each('messages', ['id', 'name'])
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        messages = [self._multi_field_message(msg_id=i) for i in range(1, 5)]
+        with self.assertRaises(cros_build_lib.DieSystemExit):
+            impl(self._request(messages=messages), None, self.api_config)
 
-    messages = [self._multi_field_message(msg_id=i, name=i)
-                for i in range(1, 5)]
-    impl(self._request(messages=messages), None, self.api_config)
+    def test_multi_set(self):
+        """Test validator passes when all values set."""
 
-  def test_skip_validation(self):
-    """Test skipping validation case."""
-    @validate.require_each('messages', ['id'], allow_empty=False)
-    def impl(_input_proto, _output_proto, _config):
-      pass
+        @validate.require_each("messages", ["id", "name"])
+        def impl(_input_proto, _output_proto, _config):
+            pass
 
-    impl(self._request(), None, self.no_validate_config)
+        messages = [
+            self._multi_field_message(msg_id=i, name=i) for i in range(1, 5)
+        ]
+        impl(self._request(messages=messages), None, self.api_config)
+
+    def test_skip_validation(self):
+        """Test skipping validation case."""
+
+        @validate.require_each("messages", ["id"], allow_empty=False)
+        def impl(_input_proto, _output_proto, _config):
+            pass
+
+        impl(self._request(), None, self.no_validate_config)
 
 
 class ValidateOnlyTest(cros_test_lib.TestCase, api_config.ApiConfigMixin):
-  """validate_only decorator tests."""
+    """validate_only decorator tests."""
 
-  def test_validate_only(self):
-    """Test validate only."""
-    @validate.require('path')
-    @validate.validation_complete
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Implementation was called.')
-      return 1
+    def test_validate_only(self):
+        """Test validate only."""
 
-    # Just using arbitrary messages, we just need the
-    # (request, response, config) arguments so it can check the config.
-    rc = impl(common_pb2.Chroot(path='/chroot/path'), common_pb2.Chroot(),
-              self.validate_only_config)
+        @validate.require("path")
+        @validate.validation_complete
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Implementation was called.")
+            return 1
 
-    self.assertEqual(0, rc)
+        # Just using arbitrary messages, we just need the
+        # (request, response, config) arguments so it can check the config.
+        rc = impl(
+            common_pb2.Chroot(path="/chroot/path"),
+            common_pb2.Chroot(),
+            self.validate_only_config,
+        )
 
-  def test_no_validate_only(self):
-    """Test no use of validate only."""
-    @validate.validation_complete
-    def impl(_input_proto, _output_proto, _config):
-      self.fail('Incorrectly allowed method to execute.')
+        self.assertEqual(0, rc)
 
-    # We will get an assertion error unless validate_only prevents the function
-    # from being called.
-    with self.assertRaises(AssertionError):
-      impl(common_pb2.Chroot(), common_pb2.Chroot(), self.api_config)
+    def test_no_validate_only(self):
+        """Test no use of validate only."""
+
+        @validate.validation_complete
+        def impl(_input_proto, _output_proto, _config):
+            self.fail("Incorrectly allowed method to execute.")
+
+        # We will get an assertion error unless validate_only prevents the function
+        # from being called.
+        with self.assertRaises(AssertionError):
+            impl(common_pb2.Chroot(), common_pb2.Chroot(), self.api_config)