1import pytest
2from pybind11_tests import ExampleMandA, ConstructorStats
3
4
5def test_methods_and_attributes():
6 instance1 = ExampleMandA()
7 instance2 = ExampleMandA(32)
8
9 instance1.add1(instance2)
10 instance1.add2(instance2)
11 instance1.add3(instance2)
12 instance1.add4(instance2)
13 instance1.add5(instance2)
14 instance1.add6(32)
15 instance1.add7(32)
16 instance1.add8(32)
17 instance1.add9(32)
18 instance1.add10(32)
19
20 assert str(instance1) == "ExampleMandA[value=320]"
21 assert str(instance2) == "ExampleMandA[value=32]"
22 assert str(instance1.self1()) == "ExampleMandA[value=320]"
23 assert str(instance1.self2()) == "ExampleMandA[value=320]"
24 assert str(instance1.self3()) == "ExampleMandA[value=320]"
25 assert str(instance1.self4()) == "ExampleMandA[value=320]"
26 assert str(instance1.self5()) == "ExampleMandA[value=320]"
27
28 assert instance1.internal1() == 320
29 assert instance1.internal2() == 320
30 assert instance1.internal3() == 320
31 assert instance1.internal4() == 320
32 assert instance1.internal5() == 320
33
34 assert instance1.overloaded(1, 1.0) == "(int, float)"
35 assert instance1.overloaded(2.0, 2) == "(float, int)"
36 assert instance1.overloaded_const(3, 3.0) == "(int, float) const"
37 assert instance1.overloaded_const(4.0, 4) == "(float, int) const"
38
39 assert instance1.value == 320
40 instance1.value = 100
41 assert str(instance1) == "ExampleMandA[value=100]"
42
43 cstats = ConstructorStats.get(ExampleMandA)
44 assert cstats.alive() == 2
45 del instance1, instance2
46 assert cstats.alive() == 0
47 assert cstats.values() == ["32"]
48 assert cstats.default_constructions == 1
49 assert cstats.copy_constructions == 3
50 assert cstats.move_constructions >= 1
51 assert cstats.copy_assignments == 0
52 assert cstats.move_assignments == 0
53
54
55def test_properties():
56 from pybind11_tests import TestProperties
57
58 instance = TestProperties()
59
60 assert instance.def_readonly == 1
61 with pytest.raises(AttributeError):
62 instance.def_readonly = 2
63
64 instance.def_readwrite = 2
65 assert instance.def_readwrite == 2
66
67 assert instance.def_property_readonly == 2
68 with pytest.raises(AttributeError):
69 instance.def_property_readonly = 3
70
71 instance.def_property = 3
72 assert instance.def_property == 3
73
74
75def test_static_properties():
76 from pybind11_tests import TestProperties as Type
77
78 assert Type.def_readonly_static == 1
79 with pytest.raises(AttributeError):
80 Type.def_readonly_static = 2
81
82 Type.def_readwrite_static = 2
83 assert Type.def_readwrite_static == 2
84
85 assert Type.def_property_readonly_static == 2
86 with pytest.raises(AttributeError):
87 Type.def_property_readonly_static = 3
88
89 Type.def_property_static = 3
90 assert Type.def_property_static == 3
91
92
93@pytest.mark.parametrize("access", ["ro", "rw", "static_ro", "static_rw"])
94def test_property_return_value_policies(access):
95 from pybind11_tests import TestPropRVP
96
97 if not access.startswith("static"):
98 obj = TestPropRVP()
99 else:
100 obj = TestPropRVP
101
102 ref = getattr(obj, access + "_ref")
103 assert ref.value == 1
104 ref.value = 2
105 assert getattr(obj, access + "_ref").value == 2
106 ref.value = 1 # restore original value for static properties
107
108 copy = getattr(obj, access + "_copy")
109 assert copy.value == 1
110 copy.value = 2
111 assert getattr(obj, access + "_copy").value == 1
112
113 copy = getattr(obj, access + "_func")
114 assert copy.value == 1
115 copy.value = 2
116 assert getattr(obj, access + "_func").value == 1
117
118
119def test_property_rvalue_policy():
120 """When returning an rvalue, the return value policy is automatically changed from
121 `reference(_internal)` to `move`. The following would not work otherwise.
122 """
123 from pybind11_tests import TestPropRVP
124
125 instance = TestPropRVP()
126 o = instance.rvalue
127 assert o.value == 1
128 o = TestPropRVP.static_rvalue
129 assert o.value == 1
130
131
132def test_dynamic_attributes():
133 from pybind11_tests import DynamicClass, CppDerivedDynamicClass
134
135 instance = DynamicClass()
136 assert not hasattr(instance, "foo")
137 assert "foo" not in dir(instance)
138
139 # Dynamically add attribute
140 instance.foo = 42
141 assert hasattr(instance, "foo")
142 assert instance.foo == 42
143 assert "foo" in dir(instance)
144
145 # __dict__ should be accessible and replaceable
146 assert "foo" in instance.__dict__
147 instance.__dict__ = {"bar": True}
148 assert not hasattr(instance, "foo")
149 assert hasattr(instance, "bar")
150
151 with pytest.raises(TypeError) as excinfo:
152 instance.__dict__ = []
153 assert str(excinfo.value) == "__dict__ must be set to a dictionary, not a 'list'"
154
155 cstats = ConstructorStats.get(DynamicClass)
156 assert cstats.alive() == 1
157 del instance
158 assert cstats.alive() == 0
159
160 # Derived classes should work as well
161 class PythonDerivedDynamicClass(DynamicClass):
162 pass
163
164 for cls in CppDerivedDynamicClass, PythonDerivedDynamicClass:
165 derived = cls()
166 derived.foobar = 100
167 assert derived.foobar == 100
168
169 assert cstats.alive() == 1
170 del derived
171 assert cstats.alive() == 0
172
173
174def test_cyclic_gc():
175 from pybind11_tests import DynamicClass
176
177 # One object references itself
178 instance = DynamicClass()
179 instance.circular_reference = instance
180
181 cstats = ConstructorStats.get(DynamicClass)
182 assert cstats.alive() == 1
183 del instance
184 assert cstats.alive() == 0
185
186 # Two object reference each other
187 i1 = DynamicClass()
188 i2 = DynamicClass()
189 i1.cycle = i2
190 i2.cycle = i1
191
192 assert cstats.alive() == 2
193 del i1, i2
194 assert cstats.alive() == 0