aidegen/lib/singleton_unittest.py

#!/usr/bin/env python3
#
# Copyright 2019, 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 module_info."""

import unittest

from aidegen.lib import errors
from aidegen.lib.singleton import Singleton


class AidegenSingletonUnittests(unittest.TestCase):
    """Unit tests for singleton.py"""

    def test_get_instance(self):
        """Test get_instance with different conditions."""
        class SingletonClass(metaclass=Singleton):
            """A singleton testing class."""
            pass
        singleton_a1 = SingletonClass()
        singleton_a2 = SingletonClass.get_instance()
        self.assertTrue(singleton_a1 is singleton_a2)

    def test_get_instance_raise_error(self):
        """Test get_instance with different conditions."""
        class SingletonClass(metaclass=Singleton):
            """A singleton testing class."""
            pass
        with self.assertRaises(errors.InstanceNotExistError):
            SingletonClass.get_instance()


if __name__ == '__main__':
    unittest.main()