tests/test_error.py

# Copyright 2021 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Unittests for the error.py module."""

import inspect
import pickle
import unittest

import command
import error
import fetch
import git_command
import project
from subcmds import all_modules


imports = all_modules + [
    error,
    project,
    git_command,
    fetch,
    command,
]


class PickleTests(unittest.TestCase):
    """Make sure all our custom exceptions can be pickled."""

    def getExceptions(self):
        """Return all our custom exceptions."""
        for entry in imports:
            for name in dir(entry):
                cls = getattr(entry, name)
                if isinstance(cls, type) and issubclass(cls, Exception):
                    yield cls

    def testExceptionLookup(self):
        """Make sure our introspection logic works."""
        classes = list(self.getExceptions())
        self.assertIn(error.HookError, classes)
        # Don't assert the exact number to avoid being a change-detector test.
        self.assertGreater(len(classes), 10)

    def testPickle(self):
        """Try to pickle all the exceptions."""
        for cls in self.getExceptions():
            args = inspect.getfullargspec(cls.__init__).args[1:]
            obj = cls(*args)
            p = pickle.dumps(obj)
            try:
                newobj = pickle.loads(p)
            except Exception as e:  # pylint: disable=broad-except
                self.fail(
                    "Class %s is unable to be pickled: %s\n"
                    "Incomplete super().__init__(...) call?" % (cls, e)
                )
            self.assertIsInstance(newobj, cls)
            self.assertEqual(str(obj), str(newobj))