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from __future__ import print_function
import unittest
import types
import wrapt
from compat import PYXY, exec_, getfullargspec
DECORATORS_CODE = """
import wrapt
@wrapt.decorator
def passthru_decorator(wrapped, instance, args, kwargs):
return wrapped(*args, **kwargs)
"""
decorators = types.ModuleType('decorators')
exec_(DECORATORS_CODE, decorators.__dict__, decorators.__dict__)
class Class(object):
@classmethod
def function(self, arg):
'''documentation'''
return arg
Original = Class
class Class(object):
@classmethod
@decorators.passthru_decorator
def function(self, arg):
'''documentation'''
return arg
class TestNamingOuterClassMethod(unittest.TestCase):
def test_class_object_name(self):
# Test preservation of instance method __name__ attribute.
self.assertEqual(Class.function.__name__,
Original.function.__name__)
def test_instance_object_name(self):
# Test preservation of instance method __name__ attribute.
self.assertEqual(Class().function.__name__,
Original().function.__name__)
def test_class_object_qualname(self):
# Test preservation of instance method __qualname__ attribute.
try:
__qualname__ = Original.original.__qualname__
except AttributeError:
pass
else:
self.assertEqual(Class.function.__qualname__, __qualname__)
def test_instance_object_qualname(self):
# Test preservation of instance method __qualname__ attribute.
try:
__qualname__ = Original().original.__qualname__
except AttributeError:
pass
else:
self.assertEqual(Class().function.__qualname__, __qualname__)
def test_class_module_name(self):
# Test preservation of instance method __module__ attribute.
self.assertEqual(Class.function.__module__,
Original.function.__module__)
def test_instance_module_name(self):
# Test preservation of instance method __module__ attribute.
self.assertEqual(Class().function.__module__,
Original().function.__module__)
def test_class_doc_string(self):
# Test preservation of instance method __doc__ attribute.
self.assertEqual(Class.function.__doc__,
Original.function.__doc__)
def test_instance_doc_string(self):
# Test preservation of instance method __doc__ attribute.
self.assertEqual(Class().function.__doc__,
Original().function.__doc__)
def test_class_argspec(self):
# Test preservation of instance method argument specification.
original_argspec = getfullargspec(Original.function)
function_argspec = getfullargspec(Class.function)
self.assertEqual(original_argspec, function_argspec)
def test_instance_argspec(self):
# Test preservation of instance method argument specification.
original_argspec = getfullargspec(Original().function)
function_argspec = getfullargspec(Class().function)
self.assertEqual(original_argspec, function_argspec)
def test_class_isinstance(self):
# Test preservation of isinstance() checks.
self.assertTrue(isinstance(Class.function,
type(Original.function)))
def test_instance_isinstance(self):
# Test preservation of isinstance() checks.
self.assertTrue(isinstance(Class().function,
type(Original().function)))
class TestCallingOuterClassMethod(unittest.TestCase):
def test_class_call_function(self):
# Test calling classmethod. Prior to Python 3.9, the instance
# and class passed to the wrapper will both be None because our
# decorator is surrounded by the classmethod decorator. The
# classmethod decorator doesn't bind the method and treats it
# like a normal function, explicitly passing the class as the
# first argument with the actual arguments following that. This
# was only finally fixed in Python 3.9. For more details see:
# https://bugs.python.org/issue19072
_args = (1, 2)
_kwargs = {'one': 1, 'two': 2}
@wrapt.decorator
def _decorator(wrapped, instance, args, kwargs):
if PYXY < (3, 9):
self.assertEqual(instance, None)
self.assertEqual(args, (Class,)+_args)
else:
self.assertEqual(instance, Class)
self.assertEqual(args, _args)
self.assertEqual(kwargs, _kwargs)
self.assertEqual(wrapped.__module__, _function.__module__)
self.assertEqual(wrapped.__name__, _function.__name__)
return wrapped(*args, **kwargs)
@_decorator
def _function(*args, **kwargs):
return args, kwargs
class Class(object):
@classmethod
@_decorator
def _function(cls, *args, **kwargs):
return (args, kwargs)
result = Class._function(*_args, **_kwargs)
self.assertEqual(result, (_args, _kwargs))
def test_instance_call_function(self):
# Test calling classmethod via class instance. Prior to Python
# 3.9, the instance and class passed to the wrapper will both be
# None because our decorator is surrounded by the classmethod
# decorator. The classmethod decorator doesn't bind the method
# and treats it like a normal function, explicitly passing the
# class as the first argument with the actual arguments
# following that. This was only finally fixed in Python 3.9. For
# more details see: https://bugs.python.org/issue19072
_args = (1, 2)
_kwargs = {'one': 1, 'two': 2}
@wrapt.decorator
def _decorator(wrapped, instance, args, kwargs):
if PYXY < (3, 9):
self.assertEqual(instance, None)
self.assertEqual(args, (Class,)+_args)
else:
self.assertEqual(instance, Class)
self.assertEqual(args, _args)
self.assertEqual(kwargs, _kwargs)
self.assertEqual(wrapped.__module__, _function.__module__)
self.assertEqual(wrapped.__name__, _function.__name__)
return wrapped(*args, **kwargs)
@_decorator
def _function(*args, **kwargs):
return args, kwargs
class Class(object):
@classmethod
@_decorator
def _function(cls, *args, **kwargs):
return (args, kwargs)
result = Class()._function(*_args, **_kwargs)
self.assertEqual(result, (_args, _kwargs))
if __name__ == '__main__':
unittest.main()
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