282 lines
8.9 KiB
Python
282 lines
8.9 KiB
Python
import pytest
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from pybind11_tests import class_ as m
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from pybind11_tests import UserType, ConstructorStats
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def test_repr():
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# In Python 3.3+, repr() accesses __qualname__
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assert "pybind11_type" in repr(type(UserType))
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assert "UserType" in repr(UserType)
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def test_instance(msg):
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with pytest.raises(TypeError) as excinfo:
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m.NoConstructor()
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assert msg(excinfo.value) == "m.class_.NoConstructor: No constructor defined!"
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instance = m.NoConstructor.new_instance()
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cstats = ConstructorStats.get(m.NoConstructor)
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assert cstats.alive() == 1
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del instance
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assert cstats.alive() == 0
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def test_docstrings(doc):
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assert doc(UserType) == "A `py::class_` type for testing"
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assert UserType.__name__ == "UserType"
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assert UserType.__module__ == "pybind11_tests"
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assert UserType.get_value.__name__ == "get_value"
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assert UserType.get_value.__module__ == "pybind11_tests"
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assert doc(UserType.get_value) == """
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get_value(self: m.UserType) -> int
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Get value using a method
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"""
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assert doc(UserType.value) == "Get/set value using a property"
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assert doc(m.NoConstructor.new_instance) == """
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new_instance() -> m.class_.NoConstructor
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Return an instance
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"""
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def test_qualname(doc):
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"""Tests that a properly qualified name is set in __qualname__ (even in pre-3.3, where we
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backport the attribute) and that generated docstrings properly use it and the module name"""
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assert m.NestBase.__qualname__ == "NestBase"
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assert m.NestBase.Nested.__qualname__ == "NestBase.Nested"
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assert doc(m.NestBase.__init__) == """
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__init__(self: m.class_.NestBase) -> None
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"""
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assert doc(m.NestBase.g) == """
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g(self: m.class_.NestBase, arg0: m.class_.NestBase.Nested) -> None
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"""
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assert doc(m.NestBase.Nested.__init__) == """
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__init__(self: m.class_.NestBase.Nested) -> None
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"""
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assert doc(m.NestBase.Nested.fn) == """
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fn(self: m.class_.NestBase.Nested, arg0: int, arg1: m.class_.NestBase, arg2: m.class_.NestBase.Nested) -> None
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""" # noqa: E501 line too long
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assert doc(m.NestBase.Nested.fa) == """
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fa(self: m.class_.NestBase.Nested, a: int, b: m.class_.NestBase, c: m.class_.NestBase.Nested) -> None
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""" # noqa: E501 line too long
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assert m.NestBase.__module__ == "pybind11_tests.class_"
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assert m.NestBase.Nested.__module__ == "pybind11_tests.class_"
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def test_inheritance(msg):
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roger = m.Rabbit('Rabbit')
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assert roger.name() + " is a " + roger.species() == "Rabbit is a parrot"
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assert m.pet_name_species(roger) == "Rabbit is a parrot"
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polly = m.Pet('Polly', 'parrot')
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assert polly.name() + " is a " + polly.species() == "Polly is a parrot"
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assert m.pet_name_species(polly) == "Polly is a parrot"
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molly = m.Dog('Molly')
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assert molly.name() + " is a " + molly.species() == "Molly is a dog"
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assert m.pet_name_species(molly) == "Molly is a dog"
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fred = m.Hamster('Fred')
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assert fred.name() + " is a " + fred.species() == "Fred is a rodent"
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assert m.dog_bark(molly) == "Woof!"
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with pytest.raises(TypeError) as excinfo:
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m.dog_bark(polly)
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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.class_.Dog) -> str
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Invoked with: <m.class_.Pet object at 0>
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"""
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with pytest.raises(TypeError) as excinfo:
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m.Chimera("lion", "goat")
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assert "No constructor defined!" in str(excinfo.value)
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def test_automatic_upcasting():
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assert type(m.return_class_1()).__name__ == "DerivedClass1"
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assert type(m.return_class_2()).__name__ == "DerivedClass2"
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assert type(m.return_none()).__name__ == "NoneType"
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# Repeat these a few times in a random order to ensure no invalid caching is applied
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assert type(m.return_class_n(1)).__name__ == "DerivedClass1"
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assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
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assert type(m.return_class_n(0)).__name__ == "BaseClass"
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assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
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assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
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assert type(m.return_class_n(0)).__name__ == "BaseClass"
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assert type(m.return_class_n(1)).__name__ == "DerivedClass1"
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def test_isinstance():
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objects = [tuple(), dict(), m.Pet("Polly", "parrot")] + [m.Dog("Molly")] * 4
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expected = (True, True, True, True, True, False, False)
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assert m.check_instances(objects) == expected
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def test_mismatched_holder():
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import re
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with pytest.raises(RuntimeError) as excinfo:
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m.mismatched_holder_1()
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assert re.match('generic_type: type ".*MismatchDerived1" does not have a non-default '
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'holder type while its base ".*MismatchBase1" does', str(excinfo.value))
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with pytest.raises(RuntimeError) as excinfo:
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m.mismatched_holder_2()
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assert re.match('generic_type: type ".*MismatchDerived2" has a non-default holder type '
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'while its base ".*MismatchBase2" does not', str(excinfo.value))
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def test_override_static():
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"""#511: problem with inheritance + overwritten def_static"""
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b = m.MyBase.make()
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d1 = m.MyDerived.make2()
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d2 = m.MyDerived.make()
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assert isinstance(b, m.MyBase)
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assert isinstance(d1, m.MyDerived)
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assert isinstance(d2, m.MyDerived)
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def test_implicit_conversion_life_support():
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"""Ensure the lifetime of temporary objects created for implicit conversions"""
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assert m.implicitly_convert_argument(UserType(5)) == 5
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assert m.implicitly_convert_variable(UserType(5)) == 5
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assert "outside a bound function" in m.implicitly_convert_variable_fail(UserType(5))
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def test_operator_new_delete(capture):
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"""Tests that class-specific operator new/delete functions are invoked"""
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class SubAliased(m.AliasedHasOpNewDelSize):
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pass
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with capture:
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a = m.HasOpNewDel()
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b = m.HasOpNewDelSize()
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d = m.HasOpNewDelBoth()
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assert capture == """
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A new 8
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B new 4
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D new 32
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"""
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sz_alias = str(m.AliasedHasOpNewDelSize.size_alias)
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sz_noalias = str(m.AliasedHasOpNewDelSize.size_noalias)
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with capture:
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c = m.AliasedHasOpNewDelSize()
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c2 = SubAliased()
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assert capture == (
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"C new " + sz_noalias + "\n" +
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"C new " + sz_alias + "\n"
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)
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with capture:
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del a
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pytest.gc_collect()
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del b
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pytest.gc_collect()
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del d
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pytest.gc_collect()
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assert capture == """
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A delete
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B delete 4
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D delete
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"""
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with capture:
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del c
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pytest.gc_collect()
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del c2
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pytest.gc_collect()
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assert capture == (
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"C delete " + sz_noalias + "\n" +
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"C delete " + sz_alias + "\n"
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)
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def test_bind_protected_functions():
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"""Expose protected member functions to Python using a helper class"""
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a = m.ProtectedA()
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assert a.foo() == 42
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b = m.ProtectedB()
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assert b.foo() == 42
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class C(m.ProtectedB):
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def __init__(self):
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m.ProtectedB.__init__(self)
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def foo(self):
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return 0
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c = C()
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assert c.foo() == 0
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def test_brace_initialization():
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""" Tests that simple POD classes can be constructed using C++11 brace initialization """
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a = m.BraceInitialization(123, "test")
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assert a.field1 == 123
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assert a.field2 == "test"
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# Tests that a non-simple class doesn't get brace initialization (if the
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# class defines an initializer_list constructor, in particular, it would
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# win over the expected constructor).
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b = m.NoBraceInitialization([123, 456])
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assert b.vec == [123, 456]
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@pytest.unsupported_on_pypy
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def test_class_refcount():
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"""Instances must correctly increase/decrease the reference count of their types (#1029)"""
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from sys import getrefcount
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class PyDog(m.Dog):
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pass
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for cls in m.Dog, PyDog:
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refcount_1 = getrefcount(cls)
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molly = [cls("Molly") for _ in range(10)]
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refcount_2 = getrefcount(cls)
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del molly
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pytest.gc_collect()
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refcount_3 = getrefcount(cls)
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assert refcount_1 == refcount_3
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assert refcount_2 > refcount_1
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def test_reentrant_implicit_conversion_failure(msg):
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# ensure that there is no runaway reentrant implicit conversion (#1035)
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with pytest.raises(TypeError) as excinfo:
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m.BogusImplicitConversion(0)
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assert msg(excinfo.value) == '''
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__init__(): incompatible constructor arguments. The following argument types are supported:
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1. m.class_.BogusImplicitConversion(arg0: m.class_.BogusImplicitConversion)
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Invoked with: 0
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'''
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def test_error_after_conversions():
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with pytest.raises(TypeError) as exc_info:
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m.test_error_after_conversions("hello")
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assert str(exc_info.value).startswith(
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"Unable to convert function return value to a Python type!")
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def test_aligned():
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if hasattr(m, "Aligned"):
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p = m.Aligned().ptr()
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assert p % 1024 == 0
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