openlp/tests/functional/openlp_core/common/test_mixins.py

# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

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# OpenLP - Open Source Lyrics Projection                                      #
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"""
Package to test the openlp.core.common package.
"""
from unittest import TestCase

from openlp.core.common.mixins import RegistryMixin
from openlp.core.common.registry import Registry


class PlainStub(object):
    def __init__(self):
        pass


class MixinStub(RegistryMixin):
    def __init__(self):
        super().__init__(None)


class TestRegistryMixin(TestCase):

    def test_registry_mixin_missing(self):
        """
        Test the registry creation and its usage
        """
        # GIVEN: A new registry
        Registry.create()

        # WHEN: I create an instance of a class that doesn't inherit from RegistryMixin
        PlainStub()

        # THEN: Nothing is registered with the registry
        self.assertEqual(len(Registry().functions_list), 0), 'The function should not be in the dict anymore.'

    def test_registry_mixin_present(self):
        """
        Test the registry creation and its usage
        """
        # GIVEN: A new registry
        Registry.create()

        # WHEN: I create an instance of a class that inherits from RegistryMixin
        MixinStub()

        # THEN: The bootstrap methods should be registered
        self.assertEqual(len(Registry().functions_list), 2), 'The bootstrap functions should be in the dict.'