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import pytest |
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3
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4
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@pytest.fixture |
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5
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def subclass_registry_metaclass(): |
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from so_magic.utils import SubclassRegistry |
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return SubclassRegistry |
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9
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10
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@pytest.fixture |
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def assert_correct_class_creation(subclass_registry_metaclass): |
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def assert_class_creation(user_class): |
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assert type(user_class) == subclass_registry_metaclass |
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assert hasattr(user_class, 'subclasses') |
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assert hasattr(user_class, 'create') |
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assert hasattr(user_class, 'register_as_subclass') |
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assert user_class.subclasses == {} |
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return assert_class_creation |
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@pytest.fixture |
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def usage_with_subclass(subclass_registry_metaclass, assert_correct_metaclass_behaviour): |
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def parent_n_child_classes(subclass_id: str): |
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class ParentClass(metaclass=subclass_registry_metaclass): |
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pass |
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@ParentClass.register_as_subclass(subclass_id) |
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class Child1(ParentClass): |
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pass |
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child1_instance1 = ParentClass.create(subclass_id) |
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assert_correct_metaclass_behaviour(ParentClass, subclass_id, Child1, child1_instance1) |
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assert isinstance(child1_instance1, ParentClass) |
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return child1_instance1, Child1, ParentClass |
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return parent_n_child_classes |
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39
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40
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@pytest.fixture |
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def plain_usage(subclass_registry_metaclass, assert_correct_metaclass_behaviour): |
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def parent_n_child_classes(subclass_id: str): |
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class ParentClass2(metaclass=subclass_registry_metaclass): |
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pass |
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@ParentClass2.register_as_subclass() |
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class Child2: |
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pass |
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child1_instance2 = ParentClass2.create(subclass_id) |
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52
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assert_correct_metaclass_behaviour(ParentClass2, subclass_id, Child2, child1_instance2) |
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assert not isinstance(child1_instance2, ParentClass2) |
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return child1_instance2, Child2, ParentClass2 |
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return parent_n_child_classes |
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58
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59
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@pytest.fixture |
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60
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def assert_correct_metaclass_behaviour(): |
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def assert_metaclass_behaviour(metaclass_user, subclass_id, subclass, subclass_instance): |
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assert metaclass_user.subclasses[subclass_id] == subclass |
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assert type(subclass_instance) == subclass |
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assert isinstance(subclass_instance, subclass) |
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return assert_metaclass_behaviour |
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68
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def test_metaclass_usage(subclass_registry_metaclass, assert_correct_class_creation): |
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class ParentClass(metaclass=subclass_registry_metaclass): |
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pass |
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assert_correct_class_creation(ParentClass) |
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75
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def test_subclass_registry(usage_with_subclass, plain_usage): |
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child1_instance1, Child1, ParentClass = usage_with_subclass('child1') |
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non_existent_identifier = 'child2' |
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80
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exception_message_regex = \ |
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f'Bad "{str(ParentClass.__name__)}" subclass request; requested subclass with identifier ' \ |
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f'{non_existent_identifier}, but known identifiers are ' \ |
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rf'\[{", ".join(subclass_identifier for subclass_identifier in ParentClass.subclasses.keys())}\]' |
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85
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with pytest.raises(ValueError, match=exception_message_regex): |
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ParentClass.create(non_existent_identifier) |
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87
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88
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child1_instance2, Child2, ParentClass2 = plain_usage('child2') |
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assert ParentClass.subclasses['child1'] == Child1 |
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90
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boromir674 /
so-magic
