test_exceptions.py revision 12391:ceeca8b41e4b
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" 145