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b3794f1087
The custom exception handling added in PR #273 is robust, but is overly complex for declaring the most common simple C++ -> Python exception mapping that needs only to copy `what()`. This add a simpler `py::register_exception<CppExp>(module, "PyExp");` function that greatly simplifies the common basic case of translation of a simple CppException into a simple PythonException, while not removing the more advanced capabilities of defining custom exception handlers.
75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
import pytest
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def test_error_already_set(msg):
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from pybind11_tests import throw_already_set
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with pytest.raises(RuntimeError) as excinfo:
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throw_already_set(False)
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assert msg(excinfo.value) == "Unknown internal error occurred"
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with pytest.raises(ValueError) as excinfo:
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throw_already_set(True)
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assert msg(excinfo.value) == "foo"
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def test_python_call_in_catch():
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from pybind11_tests import python_call_in_destructor
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d = {}
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assert python_call_in_destructor(d) is True
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assert d["good"] is True
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def test_custom(msg):
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from pybind11_tests import (MyException, MyException5, MyException5_1,
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throws1, throws2, throws3, throws4, throws5, throws5_1,
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throws_logic_error)
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# Can we catch a MyException?"
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with pytest.raises(MyException) as excinfo:
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throws1()
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assert msg(excinfo.value) == "this error should go to a custom type"
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# Can we translate to standard Python exceptions?
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with pytest.raises(RuntimeError) as excinfo:
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throws2()
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assert msg(excinfo.value) == "this error should go to a standard Python exception"
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# Can we handle unknown exceptions?
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with pytest.raises(RuntimeError) as excinfo:
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throws3()
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assert msg(excinfo.value) == "Caught an unknown exception!"
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# Can we delegate to another handler by rethrowing?
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with pytest.raises(MyException) as excinfo:
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throws4()
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assert msg(excinfo.value) == "this error is rethrown"
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# "Can we fall-through to the default handler?"
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with pytest.raises(RuntimeError) as excinfo:
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throws_logic_error()
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assert msg(excinfo.value) == "this error should fall through to the standard handler"
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# Can we handle a helper-declared exception?
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with pytest.raises(MyException5) as excinfo:
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throws5()
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assert msg(excinfo.value) == "this is a helper-defined translated exception"
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# Exception subclassing:
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with pytest.raises(MyException5) as excinfo:
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throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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assert isinstance(excinfo.value, MyException5_1)
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with pytest.raises(MyException5_1) as excinfo:
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throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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with pytest.raises(MyException5) as excinfo:
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try:
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throws5()
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except MyException5_1 as e:
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raise RuntimeError("Exception error: caught child from parent")
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assert msg(excinfo.value) == "this is a helper-defined translated exception"
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