1import pytest
2
3from pybind11_tests import exceptions as m
4import pybind11_cross_module_tests as cm
5
6
7def test_std_exception(msg):
8 with pytest.raises(RuntimeError) as excinfo:
9 m.throw_std_exception()
10 assert msg(excinfo.value) == "This exception was intentionally thrown."
11
12
13def test_error_already_set(msg):
14 with pytest.raises(RuntimeError) as excinfo:
15 m.throw_already_set(False)
16 assert msg(excinfo.value) == "Unknown internal error occurred"
17
18 with pytest.raises(ValueError) as excinfo:
19 m.throw_already_set(True)
20 assert msg(excinfo.value) == "foo"
21
22
23def test_cross_module_exceptions():
24 with pytest.raises(RuntimeError) as excinfo:
25 cm.raise_runtime_error()
26 assert str(excinfo.value) == "My runtime error"
27
28 with pytest.raises(ValueError) as excinfo:
29 cm.raise_value_error()
30 assert str(excinfo.value) == "My value error"
31
32 with pytest.raises(ValueError) as excinfo:
33 cm.throw_pybind_value_error()
34 assert str(excinfo.value) == "pybind11 value error"
35
36 with pytest.raises(TypeError) as excinfo:
37 cm.throw_pybind_type_error()
38 assert str(excinfo.value) == "pybind11 type error"
39
40 with pytest.raises(StopIteration) as excinfo:
41 cm.throw_stop_iteration()
42
43
44def test_python_call_in_catch():
45 d = {}
46 assert m.python_call_in_destructor(d) is True
47 assert d["good"] is True
48
49
50def test_exception_matches():
51 m.exception_matches()
52
53
54def test_custom(msg):
55 # Can we catch a MyException?
56 with pytest.raises(m.MyException) as excinfo:
57 m.throws1()
58 assert msg(excinfo.value) == "this error should go to a custom type"
59
60 # Can we translate to standard Python exceptions?
61 with pytest.raises(RuntimeError) as excinfo:
62 m.throws2()
63 assert msg(excinfo.value) == "this error should go to a standard Python exception"
64
65 # Can we handle unknown exceptions?
66 with pytest.raises(RuntimeError) as excinfo:
67 m.throws3()
68 assert msg(excinfo.value) == "Caught an unknown exception!"
69
70 # Can we delegate to another handler by rethrowing?
71 with pytest.raises(m.MyException) as excinfo:
72 m.throws4()
73 assert msg(excinfo.value) == "this error is rethrown"
74
75 # Can we fall-through to the default handler?
76 with pytest.raises(RuntimeError) as excinfo:
77 m.throws_logic_error()
78 assert msg(excinfo.value) == "this error should fall through to the standard handler"
79
80 # Can we handle a helper-declared exception?
81 with pytest.raises(m.MyException5) as excinfo:
82 m.throws5()
83 assert msg(excinfo.value) == "this is a helper-defined translated exception"
84
85 # Exception subclassing:
86 with pytest.raises(m.MyException5) as excinfo:
87 m.throws5_1()
88 assert msg(excinfo.value) == "MyException5 subclass"
89 assert isinstance(excinfo.value, m.MyException5_1)
90
91 with pytest.raises(m.MyException5_1) as excinfo:
92 m.throws5_1()
93 assert msg(excinfo.value) == "MyException5 subclass"
94
95 with pytest.raises(m.MyException5) as excinfo:
96 try:
97 m.throws5()
98 except m.MyException5_1:
99 raise RuntimeError("Exception error: caught child from parent")
100 assert msg(excinfo.value) == "this is a helper-defined translated exception"
101
102
103def test_nested_throws(capture):
104 """Tests nested (e.g. C++ -> Python -> C++) exception handling"""
105
106 def throw_myex():
107 raise m.MyException("nested error")
108
109 def throw_myex5():
110 raise m.MyException5("nested error 5")
111
112 # In the comments below, the exception is caught in the first step, thrown in the last step
113
114 # C++ -> Python
115 with capture:
116 m.try_catch(m.MyException5, throw_myex5)
117 assert str(capture).startswith("MyException5: nested error 5")
118
119 # Python -> C++ -> Python
120 with pytest.raises(m.MyException) as excinfo:
121 m.try_catch(m.MyException5, throw_myex)
122 assert str(excinfo.value) == "nested error"
123
124 def pycatch(exctype, f, *args):
125 try:
126 f(*args)
127 except m.MyException as e:
128 print(e)
129
130 # C++ -> Python -> C++ -> Python
131 with capture:
132 m.try_catch(
133 m.MyException5, pycatch, m.MyException, m.try_catch, m.MyException, throw_myex5)
134 assert str(capture).startswith("MyException5: nested error 5")
135
136 # C++ -> Python -> C++
137 with capture:
138 m.try_catch(m.MyException, pycatch, m.MyException5, m.throws4)
139 assert capture == "this error is rethrown"
140
141 # Python -> C++ -> Python -> C++
142 with pytest.raises(m.MyException5) as excinfo:
143 m.try_catch(m.MyException, pycatch, m.MyException, m.throws5)
144 assert str(excinfo.value) == "this is a helper-defined translated exception"