210 lines
6.6 KiB
Python
210 lines
6.6 KiB
Python
# -*- coding: utf-8 -*-
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import sys
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import pytest
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from pybind11_tests import exceptions as m
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import pybind11_cross_module_tests as cm
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def test_std_exception(msg):
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with pytest.raises(RuntimeError) as excinfo:
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m.throw_std_exception()
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assert msg(excinfo.value) == "This exception was intentionally thrown."
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def test_error_already_set(msg):
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with pytest.raises(RuntimeError) as excinfo:
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m.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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m.throw_already_set(True)
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assert msg(excinfo.value) == "foo"
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def test_cross_module_exceptions():
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with pytest.raises(RuntimeError) as excinfo:
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cm.raise_runtime_error()
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assert str(excinfo.value) == "My runtime error"
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with pytest.raises(ValueError) as excinfo:
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cm.raise_value_error()
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assert str(excinfo.value) == "My value error"
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with pytest.raises(ValueError) as excinfo:
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cm.throw_pybind_value_error()
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assert str(excinfo.value) == "pybind11 value error"
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with pytest.raises(TypeError) as excinfo:
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cm.throw_pybind_type_error()
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assert str(excinfo.value) == "pybind11 type error"
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with pytest.raises(StopIteration) as excinfo:
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cm.throw_stop_iteration()
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def test_python_call_in_catch():
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d = {}
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assert m.python_call_in_destructor(d) is True
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assert d["good"] is True
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def ignore_pytest_unraisable_warning(f):
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unraisable = "PytestUnraisableExceptionWarning"
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if hasattr(pytest, unraisable): # Python >= 3.8 and pytest >= 6
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dec = pytest.mark.filterwarnings("ignore::pytest.{}".format(unraisable))
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return dec(f)
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else:
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return f
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@ignore_pytest_unraisable_warning
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def test_python_alreadyset_in_destructor(monkeypatch, capsys):
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hooked = False
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triggered = [False] # mutable, so Python 2.7 closure can modify it
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if hasattr(sys, "unraisablehook"): # Python 3.8+
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hooked = True
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# Don't take `sys.unraisablehook`, as that's overwritten by pytest
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default_hook = sys.__unraisablehook__
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def hook(unraisable_hook_args):
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exc_type, exc_value, exc_tb, err_msg, obj = unraisable_hook_args
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if obj == "already_set demo":
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triggered[0] = True
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default_hook(unraisable_hook_args)
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return
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# Use monkeypatch so pytest can apply and remove the patch as appropriate
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monkeypatch.setattr(sys, "unraisablehook", hook)
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assert m.python_alreadyset_in_destructor("already_set demo") is True
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if hooked:
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assert triggered[0] is True
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_, captured_stderr = capsys.readouterr()
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# Error message is different in Python 2 and 3, check for words that appear in both
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assert "ignored" in captured_stderr and "already_set demo" in captured_stderr
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def test_exception_matches():
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assert m.exception_matches()
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assert m.exception_matches_base()
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assert m.modulenotfound_exception_matches_base()
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def test_custom(msg):
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# Can we catch a MyException?
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with pytest.raises(m.MyException) as excinfo:
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m.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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m.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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m.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(m.MyException) as excinfo:
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m.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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m.throws_logic_error()
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assert (
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msg(excinfo.value) == "this error should fall through to the standard handler"
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)
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# OverFlow error translation.
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with pytest.raises(OverflowError) as excinfo:
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m.throws_overflow_error()
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# Can we handle a helper-declared exception?
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with pytest.raises(m.MyException5) as excinfo:
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m.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(m.MyException5) as excinfo:
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m.throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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assert isinstance(excinfo.value, m.MyException5_1)
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with pytest.raises(m.MyException5_1) as excinfo:
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m.throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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with pytest.raises(m.MyException5) as excinfo:
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try:
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m.throws5()
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except m.MyException5_1:
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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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def test_nested_throws(capture):
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"""Tests nested (e.g. C++ -> Python -> C++) exception handling"""
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def throw_myex():
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raise m.MyException("nested error")
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def throw_myex5():
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raise m.MyException5("nested error 5")
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# In the comments below, the exception is caught in the first step, thrown in the last step
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# C++ -> Python
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with capture:
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m.try_catch(m.MyException5, throw_myex5)
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assert str(capture).startswith("MyException5: nested error 5")
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# Python -> C++ -> Python
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with pytest.raises(m.MyException) as excinfo:
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m.try_catch(m.MyException5, throw_myex)
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assert str(excinfo.value) == "nested error"
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def pycatch(exctype, f, *args):
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try:
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f(*args)
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except m.MyException as e:
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print(e)
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# C++ -> Python -> C++ -> Python
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with capture:
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m.try_catch(
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m.MyException5,
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pycatch,
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m.MyException,
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m.try_catch,
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m.MyException,
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throw_myex5,
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)
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assert str(capture).startswith("MyException5: nested error 5")
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# C++ -> Python -> C++
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with capture:
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m.try_catch(m.MyException, pycatch, m.MyException5, m.throws4)
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assert capture == "this error is rethrown"
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# Python -> C++ -> Python -> C++
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with pytest.raises(m.MyException5) as excinfo:
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m.try_catch(m.MyException, pycatch, m.MyException, m.throws5)
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assert str(excinfo.value) == "this is a helper-defined translated exception"
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# This can often happen if you wrap a pybind11 class in a Python wrapper
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def test_invalid_repr():
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class MyRepr(object):
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def __repr__(self):
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raise AttributeError("Example error")
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with pytest.raises(TypeError):
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m.simple_bool_passthrough(MyRepr())
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