python 3.4 - How can I use pytest.raises with multiple exceptions? -

i'm testing code 1 of 2 exceptions can raised: machineerror or notimplementederror. use pytest.raises make sure @ least 1 of them raised when run test code, seems accept 1 exception type argument.

this signature pytest.raises:

raises(expected_exception, *args, **kwargs) 

i tried using or keyword inside context manager:

with pytest.raises(machineerror) or pytest.raises(notimplementederror):     verb = verb("donner<ind><fut><rel><sg><1>")     verb.conjugate() 

but assume checks whether first pytest.raises none , sets second 1 context manager if is.

passing multiple exceptions positional arguments doesn't work, because pytest.raises takes second argument callable. every subsequent positional argument passed argument callable.

from documentation:

>>> raises(zerodivisionerror, lambda: 1/0) <exceptioninfo ...>  >>> def f(x): return 1/x ... >>> raises(zerodivisionerror, f, 0) <exceptioninfo ...> >>> raises(zerodivisionerror, f, x=0) <exceptioninfo ...> 

passing exceptions list doesn't work either:

traceback (most recent call last):   file "<pyshell#4>", line 1, in <module>     pytest.raises([machineerror, notimplementederror]):   file "/usr/local/lib/python3.4/dist-packages/_pytest/python.py", line 1290, in raises     raise typeerror(msg % type(expected_exception)) typeerror: exceptions must old-style classes or derived baseexception, not <class 'list'> 

is there workaround this? doesn't have use context manager.

haven't tried myself, how this? pass exceptions tuple raises:

with pytest.raises( (machineerror, notimplementederror) ):     verb = ... 

in source pytest, pytest.raises may:

• catch expected_exception; or
• pass expected_exception raisescontext instance, uses issubclass check whether exception 1 wanted.

in python 3, except statements can take tuple of exceptions. issubclass function can take tuple. therefore, using tuple should acceptable in either situation.