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import pytest
from exceptiongroup import BaseExceptionGroup, ExceptionGroup, catch
def test_bad_arg():
with pytest.raises(TypeError, match="the argument must be a mapping"):
with catch(1):
pass
def test_bad_handler():
with pytest.raises(TypeError, match="handlers must be callable"):
with catch({RuntimeError: None}):
pass
@pytest.mark.parametrize(
"exc_type",
[
pytest.param(BaseExceptionGroup, id="naked_basegroup"),
pytest.param(ExceptionGroup, id="naked_group"),
pytest.param((ValueError, BaseExceptionGroup), id="iterable_basegroup"),
pytest.param((ValueError, ExceptionGroup), id="iterable_group"),
],
)
def test_catch_exceptiongroup(exc_type):
with pytest.raises(TypeError, match="catching ExceptionGroup with catch"):
with catch({exc_type: (lambda e: True)}):
pass
def test_catch_ungrouped():
value_type_errors = []
zero_division_errors = []
for exc in [ValueError("foo"), TypeError("bar"), ZeroDivisionError()]:
with catch(
{
(ValueError, TypeError): value_type_errors.append,
ZeroDivisionError: zero_division_errors.append,
}
):
raise exc
assert len(value_type_errors) == 2
assert isinstance(value_type_errors[0], ExceptionGroup)
assert len(value_type_errors[0].exceptions) == 1
assert isinstance(value_type_errors[0].exceptions[0], ValueError)
assert isinstance(value_type_errors[1], ExceptionGroup)
assert len(value_type_errors[1].exceptions) == 1
assert isinstance(value_type_errors[1].exceptions[0], TypeError)
assert len(zero_division_errors) == 1
assert isinstance(zero_division_errors[0], ExceptionGroup)
assert isinstance(zero_division_errors[0].exceptions[0], ZeroDivisionError)
assert len(zero_division_errors[0].exceptions) == 1
def test_catch_group():
value_runtime_errors = []
zero_division_errors = []
with catch(
{
(ValueError, RuntimeError): value_runtime_errors.append,
ZeroDivisionError: zero_division_errors.append,
}
):
raise ExceptionGroup(
"booboo",
[
ValueError("foo"),
ValueError("bar"),
RuntimeError("bar"),
ZeroDivisionError(),
],
)
assert len(value_runtime_errors) == 1
assert isinstance(value_runtime_errors[0], ExceptionGroup)
exceptions = value_runtime_errors[0].exceptions
assert isinstance(exceptions[0], ValueError)
assert isinstance(exceptions[1], ValueError)
assert isinstance(exceptions[2], RuntimeError)
assert len(zero_division_errors) == 1
assert isinstance(zero_division_errors[0], ExceptionGroup)
exceptions = zero_division_errors[0].exceptions
assert isinstance(exceptions[0], ZeroDivisionError)
def test_catch_nested_group():
value_runtime_errors = []
zero_division_errors = []
with catch(
{
(ValueError, RuntimeError): value_runtime_errors.append,
ZeroDivisionError: zero_division_errors.append,
}
):
nested_group = ExceptionGroup(
"nested", [RuntimeError("bar"), ZeroDivisionError()]
)
raise ExceptionGroup("booboo", [ValueError("foo"), nested_group])
assert len(value_runtime_errors) == 1
exceptions = value_runtime_errors[0].exceptions
assert isinstance(exceptions[0], ValueError)
assert isinstance(exceptions[1], ExceptionGroup)
assert isinstance(exceptions[1].exceptions[0], RuntimeError)
assert len(zero_division_errors) == 1
assert isinstance(zero_division_errors[0], ExceptionGroup)
assert isinstance(zero_division_errors[0].exceptions[0], ExceptionGroup)
assert isinstance(
zero_division_errors[0].exceptions[0].exceptions[0], ZeroDivisionError
)
def test_catch_no_match():
try:
with catch({(ValueError, RuntimeError): (lambda e: None)}):
group = ExceptionGroup("booboo", [ZeroDivisionError()])
raise group
except ExceptionGroup as exc:
assert exc is not group
else:
pytest.fail("Did not raise an ExceptionGroup")
def test_catch_single_no_match():
try:
with catch({(ValueError, RuntimeError): (lambda e: None)}):
raise ZeroDivisionError
except ZeroDivisionError:
pass
else:
pytest.fail("Did not raise an ZeroDivisionError")
def test_catch_full_match():
with catch({(ValueError, RuntimeError): (lambda e: None)}):
raise ExceptionGroup("booboo", [ValueError()])
def test_catch_handler_raises():
def handler(exc):
raise RuntimeError("new")
with pytest.raises(RuntimeError, match="new") as exc:
with catch({(ValueError, ValueError): handler}):
excgrp = ExceptionGroup("booboo", [ValueError("bar")])
raise excgrp
context = exc.value.__context__
assert isinstance(context, ExceptionGroup)
assert str(context) == "booboo (1 sub-exception)"
assert len(context.exceptions) == 1
assert isinstance(context.exceptions[0], ValueError)
assert exc.value.__cause__ is None
def test_bare_raise_in_handler():
"""Test that a bare "raise" "middle" ecxeption group gets discarded."""
def handler(exc):
raise
with pytest.raises(ExceptionGroup) as excgrp:
with catch({(ValueError,): handler, (RuntimeError,): lambda eg: None}):
try:
first_exc = RuntimeError("first")
raise first_exc
except RuntimeError as exc:
middle_exc = ExceptionGroup(
"bad", [ValueError(), ValueError(), TypeError()]
)
raise middle_exc from exc
assert len(excgrp.value.exceptions) == 2
assert all(isinstance(exc, ValueError) for exc in excgrp.value.exceptions)
assert excgrp.value is not middle_exc
assert excgrp.value.__cause__ is first_exc
assert excgrp.value.__context__ is first_exc
def test_catch_subclass():
lookup_errors = []
with catch({LookupError: lookup_errors.append}):
raise KeyError("foo")
assert len(lookup_errors) == 1
assert isinstance(lookup_errors[0], ExceptionGroup)
exceptions = lookup_errors[0].exceptions
assert isinstance(exceptions[0], KeyError)
def test_async_handler(request):
async def handler(eg):
pass
def delegate(eg):
coro = handler(eg)
request.addfinalizer(coro.close)
return coro
with pytest.raises(TypeError, match="Exception handler must be a sync function."):
with catch({TypeError: delegate}):
raise ExceptionGroup("message", [TypeError("uh-oh")])
def test_bare_reraise_from_naked_exception():
def handler(eg):
raise
with pytest.raises(ExceptionGroup) as excgrp, catch({Exception: handler}):
raise KeyError("foo")
assert len(excgrp.value.exceptions) == 1
assert isinstance(excgrp.value.exceptions[0], KeyError)
assert str(excgrp.value.exceptions[0]) == "'foo'"
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