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test_methods_and_attributes.py
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Tue, Nov 12, 06:09

test_methods_and_attributes.py
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import pytest
from pybind11_tests import methods_and_attributes as m
from pybind11_tests import ConstructorStats
def test_methods_and_attributes():
instance1 = m.ExampleMandA()
instance2 = m.ExampleMandA(32)
instance1.add1(instance2)
instance1.add2(instance2)
instance1.add3(instance2)
instance1.add4(instance2)
instance1.add5(instance2)
instance1.add6(32)
instance1.add7(32)
instance1.add8(32)
instance1.add9(32)
instance1.add10(32)
assert str(instance1) == "ExampleMandA[value=320]"
assert str(instance2) == "ExampleMandA[value=32]"
assert str(instance1.self1()) == "ExampleMandA[value=320]"
assert str(instance1.self2()) == "ExampleMandA[value=320]"
assert str(instance1.self3()) == "ExampleMandA[value=320]"
assert str(instance1.self4()) == "ExampleMandA[value=320]"
assert str(instance1.self5()) == "ExampleMandA[value=320]"
assert instance1.internal1() == 320
assert instance1.internal2() == 320
assert instance1.internal3() == 320
assert instance1.internal4() == 320
assert instance1.internal5() == 320
assert instance1.overloaded() == "()"
assert instance1.overloaded(0) == "(int)"
assert instance1.overloaded(1, 1.0) == "(int, float)"
assert instance1.overloaded(2.0, 2) == "(float, int)"
assert instance1.overloaded(3, 3) == "(int, int)"
assert instance1.overloaded(4., 4.) == "(float, float)"
assert instance1.overloaded_const(-3) == "(int) const"
assert instance1.overloaded_const(5, 5.0) == "(int, float) const"
assert instance1.overloaded_const(6.0, 6) == "(float, int) const"
assert instance1.overloaded_const(7, 7) == "(int, int) const"
assert instance1.overloaded_const(8., 8.) == "(float, float) const"
assert instance1.overloaded_float(1, 1) == "(float, float)"
assert instance1.overloaded_float(1, 1.) == "(float, float)"
assert instance1.overloaded_float(1., 1) == "(float, float)"
assert instance1.overloaded_float(1., 1.) == "(float, float)"
assert instance1.value == 320
instance1.value = 100
assert str(instance1) == "ExampleMandA[value=100]"
cstats = ConstructorStats.get(m.ExampleMandA)
assert cstats.alive() == 2
del instance1, instance2
assert cstats.alive() == 0
assert cstats.values() == ["32"]
assert cstats.default_constructions == 1
assert cstats.copy_constructions == 3
assert cstats.move_constructions >= 1
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
def test_copy_method():
"""Issue #443: calling copied methods fails in Python 3"""
m.ExampleMandA.add2c = m.ExampleMandA.add2
m.ExampleMandA.add2d = m.ExampleMandA.add2b
a = m.ExampleMandA(123)
assert a.value == 123
a.add2(m.ExampleMandA(-100))
assert a.value == 23
a.add2b(m.ExampleMandA(20))
assert a.value == 43
a.add2c(m.ExampleMandA(6))
assert a.value == 49
a.add2d(m.ExampleMandA(-7))
assert a.value == 42
def test_properties():
instance = m.TestProperties()
assert instance.def_readonly == 1
with pytest.raises(AttributeError):
instance.def_readonly = 2
instance.def_readwrite = 2
assert instance.def_readwrite == 2
assert instance.def_property_readonly == 2
with pytest.raises(AttributeError):
instance.def_property_readonly = 3
instance.def_property = 3
assert instance.def_property == 3
with pytest.raises(AttributeError) as excinfo:
dummy = instance.def_property_writeonly # noqa: F841 unused var
assert "unreadable attribute" in str(excinfo.value)
instance.def_property_writeonly = 4
assert instance.def_property_readonly == 4
with pytest.raises(AttributeError) as excinfo:
dummy = instance.def_property_impossible # noqa: F841 unused var
assert "unreadable attribute" in str(excinfo.value)
with pytest.raises(AttributeError) as excinfo:
instance.def_property_impossible = 5
assert "can't set attribute" in str(excinfo.value)
def test_static_properties():
assert m.TestProperties.def_readonly_static == 1
with pytest.raises(AttributeError) as excinfo:
m.TestProperties.def_readonly_static = 2
assert "can't set attribute" in str(excinfo.value)
m.TestProperties.def_readwrite_static = 2
assert m.TestProperties.def_readwrite_static == 2
with pytest.raises(AttributeError) as excinfo:
dummy = m.TestProperties.def_writeonly_static # noqa: F841 unused var
assert "unreadable attribute" in str(excinfo.value)
m.TestProperties.def_writeonly_static = 3
assert m.TestProperties.def_readonly_static == 3
assert m.TestProperties.def_property_readonly_static == 3
with pytest.raises(AttributeError) as excinfo:
m.TestProperties.def_property_readonly_static = 99
assert "can't set attribute" in str(excinfo.value)
m.TestProperties.def_property_static = 4
assert m.TestProperties.def_property_static == 4
with pytest.raises(AttributeError) as excinfo:
dummy = m.TestProperties.def_property_writeonly_static
assert "unreadable attribute" in str(excinfo.value)
m.TestProperties.def_property_writeonly_static = 5
assert m.TestProperties.def_property_static == 5
# Static property read and write via instance
instance = m.TestProperties()
m.TestProperties.def_readwrite_static = 0
assert m.TestProperties.def_readwrite_static == 0
assert instance.def_readwrite_static == 0
instance.def_readwrite_static = 2
assert m.TestProperties.def_readwrite_static == 2
assert instance.def_readwrite_static == 2
with pytest.raises(AttributeError) as excinfo:
dummy = instance.def_property_writeonly_static # noqa: F841 unused var
assert "unreadable attribute" in str(excinfo.value)
instance.def_property_writeonly_static = 4
assert instance.def_property_static == 4
# It should be possible to override properties in derived classes
assert m.TestPropertiesOverride().def_readonly == 99
assert m.TestPropertiesOverride.def_readonly_static == 99
def test_static_cls():
"""Static property getter and setters expect the type object as the their only argument"""
instance = m.TestProperties()
assert m.TestProperties.static_cls is m.TestProperties
assert instance.static_cls is m.TestProperties
def check_self(self):
assert self is m.TestProperties
m.TestProperties.static_cls = check_self
instance.static_cls = check_self
def test_metaclass_override():
"""Overriding pybind11's default metaclass changes the behavior of `static_property`"""
assert type(m.ExampleMandA).__name__ == "pybind11_type"
assert type(m.MetaclassOverride).__name__ == "type"
assert m.MetaclassOverride.readonly == 1
assert type(m.MetaclassOverride.__dict__["readonly"]).__name__ == "pybind11_static_property"
# Regular `type` replaces the property instead of calling `__set__()`
m.MetaclassOverride.readonly = 2
assert m.MetaclassOverride.readonly == 2
assert isinstance(m.MetaclassOverride.__dict__["readonly"], int)
def test_no_mixed_overloads():
from pybind11_tests import debug_enabled
with pytest.raises(RuntimeError) as excinfo:
m.ExampleMandA.add_mixed_overloads1()
assert (str(excinfo.value) ==
"overloading a method with both static and instance methods is not supported; " +
("compile in debug mode for more details" if not debug_enabled else
"error while attempting to bind static method ExampleMandA.overload_mixed1"
"(arg0: float) -> str")
)
with pytest.raises(RuntimeError) as excinfo:
m.ExampleMandA.add_mixed_overloads2()
assert (str(excinfo.value) ==
"overloading a method with both static and instance methods is not supported; " +
("compile in debug mode for more details" if not debug_enabled else
"error while attempting to bind instance method ExampleMandA.overload_mixed2"
"(self: pybind11_tests.methods_and_attributes.ExampleMandA, arg0: int, arg1: int)"
" -> str")
)
@pytest.mark.parametrize("access", ["ro", "rw", "static_ro", "static_rw"])
def test_property_return_value_policies(access):
if not access.startswith("static"):
obj = m.TestPropRVP()
else:
obj = m.TestPropRVP
ref = getattr(obj, access + "_ref")
assert ref.value == 1
ref.value = 2
assert getattr(obj, access + "_ref").value == 2
ref.value = 1 # restore original value for static properties
copy = getattr(obj, access + "_copy")
assert copy.value == 1
copy.value = 2
assert getattr(obj, access + "_copy").value == 1
copy = getattr(obj, access + "_func")
assert copy.value == 1
copy.value = 2
assert getattr(obj, access + "_func").value == 1
def test_property_rvalue_policy():
"""When returning an rvalue, the return value policy is automatically changed from
`reference(_internal)` to `move`. The following would not work otherwise."""
instance = m.TestPropRVP()
o = instance.rvalue
assert o.value == 1
os = m.TestPropRVP.static_rvalue
assert os.value == 1
# https://bitbucket.org/pypy/pypy/issues/2447
@pytest.unsupported_on_pypy
def test_dynamic_attributes():
instance = m.DynamicClass()
assert not hasattr(instance, "foo")
assert "foo" not in dir(instance)
# Dynamically add attribute
instance.foo = 42
assert hasattr(instance, "foo")
assert instance.foo == 42
assert "foo" in dir(instance)
# __dict__ should be accessible and replaceable
assert "foo" in instance.__dict__
instance.__dict__ = {"bar": True}
assert not hasattr(instance, "foo")
assert hasattr(instance, "bar")
with pytest.raises(TypeError) as excinfo:
instance.__dict__ = []
assert str(excinfo.value) == "__dict__ must be set to a dictionary, not a 'list'"
cstats = ConstructorStats.get(m.DynamicClass)
assert cstats.alive() == 1
del instance
assert cstats.alive() == 0
# Derived classes should work as well
class PythonDerivedDynamicClass(m.DynamicClass):
pass
for cls in m.CppDerivedDynamicClass, PythonDerivedDynamicClass:
derived = cls()
derived.foobar = 100
assert derived.foobar == 100
assert cstats.alive() == 1
del derived
assert cstats.alive() == 0
# https://bitbucket.org/pypy/pypy/issues/2447
@pytest.unsupported_on_pypy
def test_cyclic_gc():
# One object references itself
instance = m.DynamicClass()
instance.circular_reference = instance
cstats = ConstructorStats.get(m.DynamicClass)
assert cstats.alive() == 1
del instance
assert cstats.alive() == 0
# Two object reference each other
i1 = m.DynamicClass()
i2 = m.DynamicClass()
i1.cycle = i2
i2.cycle = i1
assert cstats.alive() == 2
del i1, i2
assert cstats.alive() == 0
def test_noconvert_args(msg):
a = m.ArgInspector()
assert msg(a.f("hi")) == """
loading ArgInspector1 argument WITH conversion allowed. Argument value = hi
"""
assert msg(a.g("this is a", "this is b")) == """
loading ArgInspector1 argument WITHOUT conversion allowed. Argument value = this is a
loading ArgInspector1 argument WITH conversion allowed. Argument value = this is b
13
loading ArgInspector2 argument WITH conversion allowed. Argument value = (default arg inspector 2)
""" # noqa: E501 line too long
assert msg(a.g("this is a", "this is b", 42)) == """
loading ArgInspector1 argument WITHOUT conversion allowed. Argument value = this is a
loading ArgInspector1 argument WITH conversion allowed. Argument value = this is b
42
loading ArgInspector2 argument WITH conversion allowed. Argument value = (default arg inspector 2)
""" # noqa: E501 line too long
assert msg(a.g("this is a", "this is b", 42, "this is d")) == """
loading ArgInspector1 argument WITHOUT conversion allowed. Argument value = this is a
loading ArgInspector1 argument WITH conversion allowed. Argument value = this is b
42
loading ArgInspector2 argument WITH conversion allowed. Argument value = this is d
"""
assert (a.h("arg 1") ==
"loading ArgInspector2 argument WITHOUT conversion allowed. Argument value = arg 1")
assert msg(m.arg_inspect_func("A1", "A2")) == """
loading ArgInspector2 argument WITH conversion allowed. Argument value = A1
loading ArgInspector1 argument WITHOUT conversion allowed. Argument value = A2
"""
assert m.floats_preferred(4) == 2.0
assert m.floats_only(4.0) == 2.0
with pytest.raises(TypeError) as excinfo:
m.floats_only(4)
assert msg(excinfo.value) == """
floats_only(): incompatible function arguments. The following argument types are supported:
1. (f: float) -> float
Invoked with: 4
"""
assert m.ints_preferred(4) == 2
assert m.ints_preferred(True) == 0
with pytest.raises(TypeError) as excinfo:
m.ints_preferred(4.0)
assert msg(excinfo.value) == """
ints_preferred(): incompatible function arguments. The following argument types are supported:
1. (i: int) -> int
Invoked with: 4.0
""" # noqa: E501 line too long
assert m.ints_only(4) == 2
with pytest.raises(TypeError) as excinfo:
m.ints_only(4.0)
assert msg(excinfo.value) == """
ints_only(): incompatible function arguments. The following argument types are supported:
1. (i: int) -> int
Invoked with: 4.0
"""
def test_bad_arg_default(msg):
from pybind11_tests import debug_enabled
with pytest.raises(RuntimeError) as excinfo:
m.bad_arg_def_named()
assert msg(excinfo.value) == (
"arg(): could not convert default argument 'a: UnregisteredType' in function "
"'should_fail' into a Python object (type not registered yet?)"
if debug_enabled else
"arg(): could not convert default argument into a Python object (type not registered "
"yet?). Compile in debug mode for more information."
)
with pytest.raises(RuntimeError) as excinfo:
m.bad_arg_def_unnamed()
assert msg(excinfo.value) == (
"arg(): could not convert default argument 'UnregisteredType' in function "
"'should_fail' into a Python object (type not registered yet?)"
if debug_enabled else
"arg(): could not convert default argument into a Python object (type not registered "
"yet?). Compile in debug mode for more information."
)
def test_accepts_none(msg):
a = m.NoneTester()
assert m.no_none1(a) == 42
assert m.no_none2(a) == 42
assert m.no_none3(a) == 42
assert m.no_none4(a) == 42
assert m.no_none5(a) == 42
assert m.ok_none1(a) == 42
assert m.ok_none2(a) == 42
assert m.ok_none3(a) == 42
assert m.ok_none4(a) == 42
assert m.ok_none5(a) == 42
with pytest.raises(TypeError) as excinfo:
m.no_none1(None)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.no_none2(None)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.no_none3(None)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.no_none4(None)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.no_none5(None)
assert "incompatible function arguments" in str(excinfo.value)
# The first one still raises because you can't pass None as a lvalue reference arg:
with pytest.raises(TypeError) as excinfo:
assert m.ok_none1(None) == -1
assert msg(excinfo.value) == """
ok_none1(): incompatible function arguments. The following argument types are supported:
1. (arg0: m.methods_and_attributes.NoneTester) -> int
Invoked with: None
"""
# The rest take the argument as pointer or holder, and accept None:
assert m.ok_none2(None) == -1
assert m.ok_none3(None) == -1
assert m.ok_none4(None) == -1
assert m.ok_none5(None) == -1
def test_str_issue(msg):
"""#283: __str__ called on uninitialized instance when constructor arguments invalid"""
assert str(m.StrIssue(3)) == "StrIssue[3]"
with pytest.raises(TypeError) as excinfo:
str(m.StrIssue("no", "such", "constructor"))
assert msg(excinfo.value) == """
__init__(): incompatible constructor arguments. The following argument types are supported:
1. m.methods_and_attributes.StrIssue(arg0: int)
2. m.methods_and_attributes.StrIssue()
Invoked with: 'no', 'such', 'constructor'
"""
def test_unregistered_base_implementations():
a = m.RegisteredDerived()
a.do_nothing()
assert a.rw_value == 42
assert a.ro_value == 1.25
a.rw_value += 5
assert a.sum() == 48.25
a.increase_value()
assert a.rw_value == 48
assert a.ro_value == 1.5
assert a.sum() == 49.5
assert a.rw_value_prop == 48
a.rw_value_prop += 1
assert a.rw_value_prop == 49
a.increase_value()
assert a.ro_value_prop == 1.75
def test_custom_caster_destruction():
"""Tests that returning a pointer to a type that gets converted with a custom type caster gets
destroyed when the function has py::return_value_policy::take_ownership policy applied."""
cstats = m.destruction_tester_cstats()
# This one *doesn't* have take_ownership: the pointer should be used but not destroyed:
z = m.custom_caster_no_destroy()
assert cstats.alive() == 1 and cstats.default_constructions == 1
assert z
# take_ownership applied: this constructs a new object, casts it, then destroys it:
z = m.custom_caster_destroy()
assert z
assert cstats.default_constructions == 2
# Same, but with a const pointer return (which should *not* inhibit destruction):
z = m.custom_caster_destroy_const()
assert z
assert cstats.default_constructions == 3
# Make sure we still only have the original object (from ..._no_destroy()) alive:
assert cstats.alive() == 1

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