test_inheritance.py 1.83 KB
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import pytest


def test_inheritance(msg):
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    from pybind11_tests import Pet, Dog, Rabbit, Hamster, dog_bark, pet_name_species
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    roger = Rabbit('Rabbit')
    assert roger.name() + " is a " + roger.species() == "Rabbit is a parrot"
    assert pet_name_species(roger) == "Rabbit is a parrot"

    polly = Pet('Polly', 'parrot')
    assert polly.name() + " is a " + polly.species() == "Polly is a parrot"
    assert pet_name_species(polly) == "Polly is a parrot"

    molly = Dog('Molly')
    assert molly.name() + " is a " + molly.species() == "Molly is a dog"
    assert pet_name_species(molly) == "Molly is a dog"

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    fred = Hamster('Fred')
    assert fred.name() + " is a " + fred.species() == "Fred is a rodent"

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    assert dog_bark(molly) == "Woof!"

    with pytest.raises(TypeError) as excinfo:
        dog_bark(polly)
    assert msg(excinfo.value) == """
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        dog_bark(): incompatible function arguments. The following argument types are supported:
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            1. (arg0: m.Dog) -> str
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        Invoked with: <m.Pet object at 0>
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    """
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def test_automatic_upcasting():
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    from pybind11_tests import return_class_1, return_class_2, return_class_n, return_none
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    assert type(return_class_1()).__name__ == "DerivedClass1"
    assert type(return_class_2()).__name__ == "DerivedClass2"
    assert type(return_none()).__name__ == "NoneType"
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    # Repeat these a few times in a random order to ensure no invalid caching is applied
    assert type(return_class_n(1)).__name__ == "DerivedClass1"
    assert type(return_class_n(2)).__name__ == "DerivedClass2"
    assert type(return_class_n(0)).__name__ == "BaseClass"
    assert type(return_class_n(2)).__name__ == "DerivedClass2"
    assert type(return_class_n(2)).__name__ == "DerivedClass2"
    assert type(return_class_n(0)).__name__ == "BaseClass"
    assert type(return_class_n(1)).__name__ == "DerivedClass1"