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 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) m.TestProperties.def_readwrite_static = 2 assert m.TestProperties.def_readwrite_static == 2 assert m.TestProperties.def_property_readonly_static == 2 with pytest.raises(AttributeError) as excinfo: m.TestProperties.def_property_readonly_static = 3 assert "can't set attribute" in str(excinfo) m.TestProperties.def_property_static = 3 assert m.TestProperties.def_property_static == 3 # 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 # 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