36 lines
884 B
Python
36 lines
884 B
Python
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"""Unit tests for slot-related functionality."""
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import pytest
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from pympler.asizeof import asizeof
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import attr
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@attr.s
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class C1(object):
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x = attr.ib(validator=attr.validators.instance_of(int))
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y = attr.ib()
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@attr.s(slots=True)
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class C1Slots(object):
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x = attr.ib(validator=attr.validators.instance_of(int))
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y = attr.ib()
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def test_slots_being_used():
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"""Test whether the class really is using __slots__."""
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non_slot_instance = C1(x=1, y="test")
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slot_instance = C1Slots(x=1, y="test")
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assert "__dict__" not in dir(slot_instance)
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assert "__slots__" in dir(slot_instance)
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assert "__dict__" in dir(non_slot_instance)
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assert "__slots__" not in dir(non_slot_instance)
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assert asizeof(slot_instance) < asizeof(non_slot_instance)
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non_slot_instance.t = "test"
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with pytest.raises(AttributeError):
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slot_instance.t = "test"
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