mirror of
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2360 lines
76 KiB
Python
2360 lines
76 KiB
Python
# mock.py
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# Test tools for mocking and patching.
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# Maintained by Michael Foord
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# Backport for other versions of Python available from
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# http://pypi.python.org/pypi/mock
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__all__ = (
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'Mock',
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'MagicMock',
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'patch',
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'sentinel',
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'DEFAULT',
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'ANY',
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'call',
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'create_autospec',
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'FILTER_DIR',
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'NonCallableMock',
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'NonCallableMagicMock',
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'mock_open',
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'PropertyMock',
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)
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__version__ = '1.0'
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import inspect
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import pprint
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import sys
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import builtins
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from types import ModuleType
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from functools import wraps, partial
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_builtins = {name for name in dir(builtins) if not name.startswith('_')}
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BaseExceptions = (BaseException,)
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if 'java' in sys.platform:
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# jython
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import java
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BaseExceptions = (BaseException, java.lang.Throwable)
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FILTER_DIR = True
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# Workaround for issue #12370
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# Without this, the __class__ properties wouldn't be set correctly
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_safe_super = super
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def _is_instance_mock(obj):
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# can't use isinstance on Mock objects because they override __class__
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# The base class for all mocks is NonCallableMock
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return issubclass(type(obj), NonCallableMock)
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def _is_exception(obj):
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return (
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isinstance(obj, BaseExceptions) or
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isinstance(obj, type) and issubclass(obj, BaseExceptions)
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)
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class _slotted(object):
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__slots__ = ['a']
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DescriptorTypes = (
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type(_slotted.a),
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property,
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)
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def _get_signature_object(func, as_instance, eat_self):
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"""
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Given an arbitrary, possibly callable object, try to create a suitable
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signature object.
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Return a (reduced func, signature) tuple, or None.
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"""
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if isinstance(func, type) and not as_instance:
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# If it's a type and should be modelled as a type, use __init__.
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try:
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func = func.__init__
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except AttributeError:
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return None
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# Skip the `self` argument in __init__
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eat_self = True
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elif not isinstance(func, FunctionTypes):
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# If we really want to model an instance of the passed type,
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# __call__ should be looked up, not __init__.
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try:
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func = func.__call__
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except AttributeError:
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return None
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if eat_self:
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sig_func = partial(func, None)
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else:
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sig_func = func
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try:
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return func, inspect.signature(sig_func)
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except ValueError:
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# Certain callable types are not supported by inspect.signature()
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return None
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def _check_signature(func, mock, skipfirst, instance=False):
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sig = _get_signature_object(func, instance, skipfirst)
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if sig is None:
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return
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func, sig = sig
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def checksig(_mock_self, *args, **kwargs):
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sig.bind(*args, **kwargs)
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_copy_func_details(func, checksig)
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type(mock)._mock_check_sig = checksig
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def _copy_func_details(func, funcopy):
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funcopy.__name__ = func.__name__
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funcopy.__doc__ = func.__doc__
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try:
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funcopy.__text_signature__ = func.__text_signature__
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except AttributeError:
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pass
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# we explicitly don't copy func.__dict__ into this copy as it would
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# expose original attributes that should be mocked
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try:
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funcopy.__module__ = func.__module__
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except AttributeError:
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pass
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try:
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funcopy.__defaults__ = func.__defaults__
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except AttributeError:
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pass
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try:
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funcopy.__kwdefaults__ = func.__kwdefaults__
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except AttributeError:
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pass
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def _callable(obj):
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if isinstance(obj, type):
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return True
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if getattr(obj, '__call__', None) is not None:
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return True
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return False
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def _is_list(obj):
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# checks for list or tuples
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# XXXX badly named!
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return type(obj) in (list, tuple)
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def _instance_callable(obj):
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"""Given an object, return True if the object is callable.
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For classes, return True if instances would be callable."""
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if not isinstance(obj, type):
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# already an instance
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return getattr(obj, '__call__', None) is not None
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# *could* be broken by a class overriding __mro__ or __dict__ via
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# a metaclass
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for base in (obj,) + obj.__mro__:
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if base.__dict__.get('__call__') is not None:
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return True
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return False
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def _set_signature(mock, original, instance=False):
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# creates a function with signature (*args, **kwargs) that delegates to a
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# mock. It still does signature checking by calling a lambda with the same
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# signature as the original.
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if not _callable(original):
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return
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skipfirst = isinstance(original, type)
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result = _get_signature_object(original, instance, skipfirst)
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if result is None:
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return
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func, sig = result
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def checksig(*args, **kwargs):
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sig.bind(*args, **kwargs)
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_copy_func_details(func, checksig)
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name = original.__name__
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if not name.isidentifier():
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name = 'funcopy'
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context = {'_checksig_': checksig, 'mock': mock}
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src = """def %s(*args, **kwargs):
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_checksig_(*args, **kwargs)
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return mock(*args, **kwargs)""" % name
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exec (src, context)
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funcopy = context[name]
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_setup_func(funcopy, mock)
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return funcopy
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def _setup_func(funcopy, mock):
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funcopy.mock = mock
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# can't use isinstance with mocks
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if not _is_instance_mock(mock):
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return
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def assert_called_with(*args, **kwargs):
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return mock.assert_called_with(*args, **kwargs)
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def assert_called_once_with(*args, **kwargs):
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return mock.assert_called_once_with(*args, **kwargs)
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def assert_has_calls(*args, **kwargs):
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return mock.assert_has_calls(*args, **kwargs)
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def assert_any_call(*args, **kwargs):
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return mock.assert_any_call(*args, **kwargs)
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def reset_mock():
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funcopy.method_calls = _CallList()
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funcopy.mock_calls = _CallList()
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mock.reset_mock()
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ret = funcopy.return_value
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if _is_instance_mock(ret) and not ret is mock:
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ret.reset_mock()
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funcopy.called = False
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funcopy.call_count = 0
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funcopy.call_args = None
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funcopy.call_args_list = _CallList()
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funcopy.method_calls = _CallList()
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funcopy.mock_calls = _CallList()
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funcopy.return_value = mock.return_value
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funcopy.side_effect = mock.side_effect
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funcopy._mock_children = mock._mock_children
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funcopy.assert_called_with = assert_called_with
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funcopy.assert_called_once_with = assert_called_once_with
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funcopy.assert_has_calls = assert_has_calls
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funcopy.assert_any_call = assert_any_call
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funcopy.reset_mock = reset_mock
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mock._mock_delegate = funcopy
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def _is_magic(name):
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return '__%s__' % name[2:-2] == name
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class _SentinelObject(object):
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"A unique, named, sentinel object."
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def __init__(self, name):
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self.name = name
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def __repr__(self):
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return 'sentinel.%s' % self.name
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class _Sentinel(object):
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"""Access attributes to return a named object, usable as a sentinel."""
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def __init__(self):
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self._sentinels = {}
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def __getattr__(self, name):
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if name == '__bases__':
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# Without this help(unittest.mock) raises an exception
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raise AttributeError
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return self._sentinels.setdefault(name, _SentinelObject(name))
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sentinel = _Sentinel()
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DEFAULT = sentinel.DEFAULT
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_missing = sentinel.MISSING
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_deleted = sentinel.DELETED
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def _copy(value):
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if type(value) in (dict, list, tuple, set):
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return type(value)(value)
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return value
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_allowed_names = {
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'return_value', '_mock_return_value', 'side_effect',
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'_mock_side_effect', '_mock_parent', '_mock_new_parent',
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'_mock_name', '_mock_new_name'
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}
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def _delegating_property(name):
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_allowed_names.add(name)
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_the_name = '_mock_' + name
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def _get(self, name=name, _the_name=_the_name):
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sig = self._mock_delegate
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if sig is None:
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return getattr(self, _the_name)
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return getattr(sig, name)
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def _set(self, value, name=name, _the_name=_the_name):
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sig = self._mock_delegate
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if sig is None:
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self.__dict__[_the_name] = value
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else:
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setattr(sig, name, value)
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return property(_get, _set)
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class _CallList(list):
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def __contains__(self, value):
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if not isinstance(value, list):
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return list.__contains__(self, value)
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len_value = len(value)
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len_self = len(self)
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if len_value > len_self:
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return False
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for i in range(0, len_self - len_value + 1):
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sub_list = self[i:i+len_value]
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if sub_list == value:
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return True
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return False
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def __repr__(self):
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return pprint.pformat(list(self))
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def _check_and_set_parent(parent, value, name, new_name):
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if not _is_instance_mock(value):
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return False
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if ((value._mock_name or value._mock_new_name) or
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(value._mock_parent is not None) or
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(value._mock_new_parent is not None)):
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return False
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_parent = parent
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while _parent is not None:
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# setting a mock (value) as a child or return value of itself
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# should not modify the mock
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if _parent is value:
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return False
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_parent = _parent._mock_new_parent
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if new_name:
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value._mock_new_parent = parent
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value._mock_new_name = new_name
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if name:
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value._mock_parent = parent
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value._mock_name = name
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return True
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# Internal class to identify if we wrapped an iterator object or not.
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class _MockIter(object):
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def __init__(self, obj):
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self.obj = iter(obj)
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def __iter__(self):
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return self
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def __next__(self):
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return next(self.obj)
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class Base(object):
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_mock_return_value = DEFAULT
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_mock_side_effect = None
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def __init__(self, *args, **kwargs):
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pass
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class NonCallableMock(Base):
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"""A non-callable version of `Mock`"""
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def __new__(cls, *args, **kw):
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# every instance has its own class
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# so we can create magic methods on the
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# class without stomping on other mocks
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new = type(cls.__name__, (cls,), {'__doc__': cls.__doc__})
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instance = object.__new__(new)
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return instance
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def __init__(
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self, spec=None, wraps=None, name=None, spec_set=None,
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parent=None, _spec_state=None, _new_name='', _new_parent=None,
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_spec_as_instance=False, _eat_self=None, unsafe=False, **kwargs
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):
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if _new_parent is None:
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_new_parent = parent
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__dict__ = self.__dict__
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__dict__['_mock_parent'] = parent
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__dict__['_mock_name'] = name
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__dict__['_mock_new_name'] = _new_name
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__dict__['_mock_new_parent'] = _new_parent
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if spec_set is not None:
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spec = spec_set
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spec_set = True
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if _eat_self is None:
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_eat_self = parent is not None
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self._mock_add_spec(spec, spec_set, _spec_as_instance, _eat_self)
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__dict__['_mock_children'] = {}
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__dict__['_mock_wraps'] = wraps
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__dict__['_mock_delegate'] = None
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__dict__['_mock_called'] = False
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__dict__['_mock_call_args'] = None
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__dict__['_mock_call_count'] = 0
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__dict__['_mock_call_args_list'] = _CallList()
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__dict__['_mock_mock_calls'] = _CallList()
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__dict__['method_calls'] = _CallList()
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__dict__['_mock_unsafe'] = unsafe
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if kwargs:
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self.configure_mock(**kwargs)
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_safe_super(NonCallableMock, self).__init__(
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spec, wraps, name, spec_set, parent,
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_spec_state
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)
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def attach_mock(self, mock, attribute):
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"""
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Attach a mock as an attribute of this one, replacing its name and
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parent. Calls to the attached mock will be recorded in the
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`method_calls` and `mock_calls` attributes of this one."""
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mock._mock_parent = None
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mock._mock_new_parent = None
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mock._mock_name = ''
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mock._mock_new_name = None
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setattr(self, attribute, mock)
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def mock_add_spec(self, spec, spec_set=False):
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"""Add a spec to a mock. `spec` can either be an object or a
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list of strings. Only attributes on the `spec` can be fetched as
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attributes from the mock.
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If `spec_set` is True then only attributes on the spec can be set."""
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self._mock_add_spec(spec, spec_set)
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def _mock_add_spec(self, spec, spec_set, _spec_as_instance=False,
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_eat_self=False):
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_spec_class = None
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_spec_signature = None
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if spec is not None and not _is_list(spec):
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if isinstance(spec, type):
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_spec_class = spec
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else:
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_spec_class = _get_class(spec)
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res = _get_signature_object(spec,
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_spec_as_instance, _eat_self)
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_spec_signature = res and res[1]
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spec = dir(spec)
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__dict__ = self.__dict__
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__dict__['_spec_class'] = _spec_class
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__dict__['_spec_set'] = spec_set
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__dict__['_spec_signature'] = _spec_signature
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__dict__['_mock_methods'] = spec
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def __get_return_value(self):
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ret = self._mock_return_value
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if self._mock_delegate is not None:
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ret = self._mock_delegate.return_value
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if ret is DEFAULT:
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ret = self._get_child_mock(
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_new_parent=self, _new_name='()'
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)
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self.return_value = ret
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return ret
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def __set_return_value(self, value):
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if self._mock_delegate is not None:
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self._mock_delegate.return_value = value
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else:
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self._mock_return_value = value
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_check_and_set_parent(self, value, None, '()')
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__return_value_doc = "The value to be returned when the mock is called."
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return_value = property(__get_return_value, __set_return_value,
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__return_value_doc)
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@property
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def __class__(self):
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if self._spec_class is None:
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return type(self)
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return self._spec_class
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called = _delegating_property('called')
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call_count = _delegating_property('call_count')
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call_args = _delegating_property('call_args')
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call_args_list = _delegating_property('call_args_list')
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mock_calls = _delegating_property('mock_calls')
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def __get_side_effect(self):
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delegated = self._mock_delegate
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if delegated is None:
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return self._mock_side_effect
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sf = delegated.side_effect
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if (sf is not None and not callable(sf)
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and not isinstance(sf, _MockIter) and not _is_exception(sf)):
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sf = _MockIter(sf)
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delegated.side_effect = sf
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return sf
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def __set_side_effect(self, value):
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value = _try_iter(value)
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delegated = self._mock_delegate
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if delegated is None:
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self._mock_side_effect = value
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else:
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delegated.side_effect = value
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side_effect = property(__get_side_effect, __set_side_effect)
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|
|
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def reset_mock(self, visited=None):
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"Restore the mock object to its initial state."
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if visited is None:
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visited = []
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if id(self) in visited:
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return
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visited.append(id(self))
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self.called = False
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self.call_args = None
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self.call_count = 0
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self.mock_calls = _CallList()
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self.call_args_list = _CallList()
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self.method_calls = _CallList()
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for child in self._mock_children.values():
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if isinstance(child, _SpecState):
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continue
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child.reset_mock(visited)
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ret = self._mock_return_value
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if _is_instance_mock(ret) and ret is not self:
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ret.reset_mock(visited)
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|
|
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def configure_mock(self, **kwargs):
|
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"""Set attributes on the mock through keyword arguments.
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Attributes plus return values and side effects can be set on child
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mocks using standard dot notation and unpacking a dictionary in the
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method call:
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|
|
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
|
|
>>> mock.configure_mock(**attrs)"""
|
|
for arg, val in sorted(kwargs.items(),
|
|
# we sort on the number of dots so that
|
|
# attributes are set before we set attributes on
|
|
# attributes
|
|
key=lambda entry: entry[0].count('.')):
|
|
args = arg.split('.')
|
|
final = args.pop()
|
|
obj = self
|
|
for entry in args:
|
|
obj = getattr(obj, entry)
|
|
setattr(obj, final, val)
|
|
|
|
|
|
def __getattr__(self, name):
|
|
if name in {'_mock_methods', '_mock_unsafe'}:
|
|
raise AttributeError(name)
|
|
elif self._mock_methods is not None:
|
|
if name not in self._mock_methods or name in _all_magics:
|
|
raise AttributeError("Mock object has no attribute %r" % name)
|
|
elif _is_magic(name):
|
|
raise AttributeError(name)
|
|
if not self._mock_unsafe:
|
|
if name.startswith(('assert', 'assret')):
|
|
raise AttributeError(name)
|
|
|
|
result = self._mock_children.get(name)
|
|
if result is _deleted:
|
|
raise AttributeError(name)
|
|
elif result is None:
|
|
wraps = None
|
|
if self._mock_wraps is not None:
|
|
# XXXX should we get the attribute without triggering code
|
|
# execution?
|
|
wraps = getattr(self._mock_wraps, name)
|
|
|
|
result = self._get_child_mock(
|
|
parent=self, name=name, wraps=wraps, _new_name=name,
|
|
_new_parent=self
|
|
)
|
|
self._mock_children[name] = result
|
|
|
|
elif isinstance(result, _SpecState):
|
|
result = create_autospec(
|
|
result.spec, result.spec_set, result.instance,
|
|
result.parent, result.name
|
|
)
|
|
self._mock_children[name] = result
|
|
|
|
return result
|
|
|
|
|
|
def __repr__(self):
|
|
_name_list = [self._mock_new_name]
|
|
_parent = self._mock_new_parent
|
|
last = self
|
|
|
|
dot = '.'
|
|
if _name_list == ['()']:
|
|
dot = ''
|
|
seen = set()
|
|
while _parent is not None:
|
|
last = _parent
|
|
|
|
_name_list.append(_parent._mock_new_name + dot)
|
|
dot = '.'
|
|
if _parent._mock_new_name == '()':
|
|
dot = ''
|
|
|
|
_parent = _parent._mock_new_parent
|
|
|
|
# use ids here so as not to call __hash__ on the mocks
|
|
if id(_parent) in seen:
|
|
break
|
|
seen.add(id(_parent))
|
|
|
|
_name_list = list(reversed(_name_list))
|
|
_first = last._mock_name or 'mock'
|
|
if len(_name_list) > 1:
|
|
if _name_list[1] not in ('()', '().'):
|
|
_first += '.'
|
|
_name_list[0] = _first
|
|
name = ''.join(_name_list)
|
|
|
|
name_string = ''
|
|
if name not in ('mock', 'mock.'):
|
|
name_string = ' name=%r' % name
|
|
|
|
spec_string = ''
|
|
if self._spec_class is not None:
|
|
spec_string = ' spec=%r'
|
|
if self._spec_set:
|
|
spec_string = ' spec_set=%r'
|
|
spec_string = spec_string % self._spec_class.__name__
|
|
return "<%s%s%s id='%s'>" % (
|
|
type(self).__name__,
|
|
name_string,
|
|
spec_string,
|
|
id(self)
|
|
)
|
|
|
|
|
|
def __dir__(self):
|
|
"""Filter the output of `dir(mock)` to only useful members."""
|
|
if not FILTER_DIR:
|
|
return object.__dir__(self)
|
|
|
|
extras = self._mock_methods or []
|
|
from_type = dir(type(self))
|
|
from_dict = list(self.__dict__)
|
|
|
|
from_type = [e for e in from_type if not e.startswith('_')]
|
|
from_dict = [e for e in from_dict if not e.startswith('_') or
|
|
_is_magic(e)]
|
|
return sorted(set(extras + from_type + from_dict +
|
|
list(self._mock_children)))
|
|
|
|
|
|
def __setattr__(self, name, value):
|
|
if name in _allowed_names:
|
|
# property setters go through here
|
|
return object.__setattr__(self, name, value)
|
|
elif (self._spec_set and self._mock_methods is not None and
|
|
name not in self._mock_methods and
|
|
name not in self.__dict__):
|
|
raise AttributeError("Mock object has no attribute '%s'" % name)
|
|
elif name in _unsupported_magics:
|
|
msg = 'Attempting to set unsupported magic method %r.' % name
|
|
raise AttributeError(msg)
|
|
elif name in _all_magics:
|
|
if self._mock_methods is not None and name not in self._mock_methods:
|
|
raise AttributeError("Mock object has no attribute '%s'" % name)
|
|
|
|
if not _is_instance_mock(value):
|
|
setattr(type(self), name, _get_method(name, value))
|
|
original = value
|
|
value = lambda *args, **kw: original(self, *args, **kw)
|
|
else:
|
|
# only set _new_name and not name so that mock_calls is tracked
|
|
# but not method calls
|
|
_check_and_set_parent(self, value, None, name)
|
|
setattr(type(self), name, value)
|
|
self._mock_children[name] = value
|
|
elif name == '__class__':
|
|
self._spec_class = value
|
|
return
|
|
else:
|
|
if _check_and_set_parent(self, value, name, name):
|
|
self._mock_children[name] = value
|
|
return object.__setattr__(self, name, value)
|
|
|
|
|
|
def __delattr__(self, name):
|
|
if name in _all_magics and name in type(self).__dict__:
|
|
delattr(type(self), name)
|
|
if name not in self.__dict__:
|
|
# for magic methods that are still MagicProxy objects and
|
|
# not set on the instance itself
|
|
return
|
|
|
|
if name in self.__dict__:
|
|
object.__delattr__(self, name)
|
|
|
|
obj = self._mock_children.get(name, _missing)
|
|
if obj is _deleted:
|
|
raise AttributeError(name)
|
|
if obj is not _missing:
|
|
del self._mock_children[name]
|
|
self._mock_children[name] = _deleted
|
|
|
|
|
|
def _format_mock_call_signature(self, args, kwargs):
|
|
name = self._mock_name or 'mock'
|
|
return _format_call_signature(name, args, kwargs)
|
|
|
|
|
|
def _format_mock_failure_message(self, args, kwargs):
|
|
message = 'Expected call: %s\nActual call: %s'
|
|
expected_string = self._format_mock_call_signature(args, kwargs)
|
|
call_args = self.call_args
|
|
if len(call_args) == 3:
|
|
call_args = call_args[1:]
|
|
actual_string = self._format_mock_call_signature(*call_args)
|
|
return message % (expected_string, actual_string)
|
|
|
|
|
|
def _call_matcher(self, _call):
|
|
"""
|
|
Given a call (or simply a (args, kwargs) tuple), return a
|
|
comparison key suitable for matching with other calls.
|
|
This is a best effort method which relies on the spec's signature,
|
|
if available, or falls back on the arguments themselves.
|
|
"""
|
|
sig = self._spec_signature
|
|
if sig is not None:
|
|
if len(_call) == 2:
|
|
name = ''
|
|
args, kwargs = _call
|
|
else:
|
|
name, args, kwargs = _call
|
|
try:
|
|
return name, sig.bind(*args, **kwargs)
|
|
except TypeError as e:
|
|
return e.with_traceback(None)
|
|
else:
|
|
return _call
|
|
|
|
def assert_not_called(_mock_self):
|
|
"""assert that the mock was never called.
|
|
"""
|
|
self = _mock_self
|
|
if self.call_count != 0:
|
|
msg = ("Expected '%s' to not have been called. Called %s times." %
|
|
(self._mock_name or 'mock', self.call_count))
|
|
raise AssertionError(msg)
|
|
|
|
def assert_called_with(_mock_self, *args, **kwargs):
|
|
"""assert that the mock was called with the specified arguments.
|
|
|
|
Raises an AssertionError if the args and keyword args passed in are
|
|
different to the last call to the mock."""
|
|
self = _mock_self
|
|
if self.call_args is None:
|
|
expected = self._format_mock_call_signature(args, kwargs)
|
|
raise AssertionError('Expected call: %s\nNot called' % (expected,))
|
|
|
|
def _error_message():
|
|
msg = self._format_mock_failure_message(args, kwargs)
|
|
return msg
|
|
expected = self._call_matcher((args, kwargs))
|
|
actual = self._call_matcher(self.call_args)
|
|
if expected != actual:
|
|
cause = expected if isinstance(expected, Exception) else None
|
|
raise AssertionError(_error_message()) from cause
|
|
|
|
|
|
def assert_called_once_with(_mock_self, *args, **kwargs):
|
|
"""assert that the mock was called exactly once and with the specified
|
|
arguments."""
|
|
self = _mock_self
|
|
if not self.call_count == 1:
|
|
msg = ("Expected '%s' to be called once. Called %s times." %
|
|
(self._mock_name or 'mock', self.call_count))
|
|
raise AssertionError(msg)
|
|
return self.assert_called_with(*args, **kwargs)
|
|
|
|
|
|
def assert_has_calls(self, calls, any_order=False):
|
|
"""assert the mock has been called with the specified calls.
|
|
The `mock_calls` list is checked for the calls.
|
|
|
|
If `any_order` is False (the default) then the calls must be
|
|
sequential. There can be extra calls before or after the
|
|
specified calls.
|
|
|
|
If `any_order` is True then the calls can be in any order, but
|
|
they must all appear in `mock_calls`."""
|
|
expected = [self._call_matcher(c) for c in calls]
|
|
cause = expected if isinstance(expected, Exception) else None
|
|
all_calls = _CallList(self._call_matcher(c) for c in self.mock_calls)
|
|
if not any_order:
|
|
if expected not in all_calls:
|
|
raise AssertionError(
|
|
'Calls not found.\nExpected: %r\n'
|
|
'Actual: %r' % (calls, self.mock_calls)
|
|
) from cause
|
|
return
|
|
|
|
all_calls = list(all_calls)
|
|
|
|
not_found = []
|
|
for kall in expected:
|
|
try:
|
|
all_calls.remove(kall)
|
|
except ValueError:
|
|
not_found.append(kall)
|
|
if not_found:
|
|
raise AssertionError(
|
|
'%r not all found in call list' % (tuple(not_found),)
|
|
) from cause
|
|
|
|
|
|
def assert_any_call(self, *args, **kwargs):
|
|
"""assert the mock has been called with the specified arguments.
|
|
|
|
The assert passes if the mock has *ever* been called, unlike
|
|
`assert_called_with` and `assert_called_once_with` that only pass if
|
|
the call is the most recent one."""
|
|
expected = self._call_matcher((args, kwargs))
|
|
actual = [self._call_matcher(c) for c in self.call_args_list]
|
|
if expected not in actual:
|
|
cause = expected if isinstance(expected, Exception) else None
|
|
expected_string = self._format_mock_call_signature(args, kwargs)
|
|
raise AssertionError(
|
|
'%s call not found' % expected_string
|
|
) from cause
|
|
|
|
|
|
def _get_child_mock(self, **kw):
|
|
"""Create the child mocks for attributes and return value.
|
|
By default child mocks will be the same type as the parent.
|
|
Subclasses of Mock may want to override this to customize the way
|
|
child mocks are made.
|
|
|
|
For non-callable mocks the callable variant will be used (rather than
|
|
any custom subclass)."""
|
|
_type = type(self)
|
|
if not issubclass(_type, CallableMixin):
|
|
if issubclass(_type, NonCallableMagicMock):
|
|
klass = MagicMock
|
|
elif issubclass(_type, NonCallableMock) :
|
|
klass = Mock
|
|
else:
|
|
klass = _type.__mro__[1]
|
|
return klass(**kw)
|
|
|
|
|
|
|
|
def _try_iter(obj):
|
|
if obj is None:
|
|
return obj
|
|
if _is_exception(obj):
|
|
return obj
|
|
if _callable(obj):
|
|
return obj
|
|
try:
|
|
return iter(obj)
|
|
except TypeError:
|
|
# XXXX backwards compatibility
|
|
# but this will blow up on first call - so maybe we should fail early?
|
|
return obj
|
|
|
|
|
|
|
|
class CallableMixin(Base):
|
|
|
|
def __init__(self, spec=None, side_effect=None, return_value=DEFAULT,
|
|
wraps=None, name=None, spec_set=None, parent=None,
|
|
_spec_state=None, _new_name='', _new_parent=None, **kwargs):
|
|
self.__dict__['_mock_return_value'] = return_value
|
|
|
|
_safe_super(CallableMixin, self).__init__(
|
|
spec, wraps, name, spec_set, parent,
|
|
_spec_state, _new_name, _new_parent, **kwargs
|
|
)
|
|
|
|
self.side_effect = side_effect
|
|
|
|
|
|
def _mock_check_sig(self, *args, **kwargs):
|
|
# stub method that can be replaced with one with a specific signature
|
|
pass
|
|
|
|
|
|
def __call__(_mock_self, *args, **kwargs):
|
|
# can't use self in-case a function / method we are mocking uses self
|
|
# in the signature
|
|
_mock_self._mock_check_sig(*args, **kwargs)
|
|
return _mock_self._mock_call(*args, **kwargs)
|
|
|
|
|
|
def _mock_call(_mock_self, *args, **kwargs):
|
|
self = _mock_self
|
|
self.called = True
|
|
self.call_count += 1
|
|
_new_name = self._mock_new_name
|
|
_new_parent = self._mock_new_parent
|
|
|
|
_call = _Call((args, kwargs), two=True)
|
|
self.call_args = _call
|
|
self.call_args_list.append(_call)
|
|
self.mock_calls.append(_Call(('', args, kwargs)))
|
|
|
|
seen = set()
|
|
skip_next_dot = _new_name == '()'
|
|
do_method_calls = self._mock_parent is not None
|
|
name = self._mock_name
|
|
while _new_parent is not None:
|
|
this_mock_call = _Call((_new_name, args, kwargs))
|
|
if _new_parent._mock_new_name:
|
|
dot = '.'
|
|
if skip_next_dot:
|
|
dot = ''
|
|
|
|
skip_next_dot = False
|
|
if _new_parent._mock_new_name == '()':
|
|
skip_next_dot = True
|
|
|
|
_new_name = _new_parent._mock_new_name + dot + _new_name
|
|
|
|
if do_method_calls:
|
|
if _new_name == name:
|
|
this_method_call = this_mock_call
|
|
else:
|
|
this_method_call = _Call((name, args, kwargs))
|
|
_new_parent.method_calls.append(this_method_call)
|
|
|
|
do_method_calls = _new_parent._mock_parent is not None
|
|
if do_method_calls:
|
|
name = _new_parent._mock_name + '.' + name
|
|
|
|
_new_parent.mock_calls.append(this_mock_call)
|
|
_new_parent = _new_parent._mock_new_parent
|
|
|
|
# use ids here so as not to call __hash__ on the mocks
|
|
_new_parent_id = id(_new_parent)
|
|
if _new_parent_id in seen:
|
|
break
|
|
seen.add(_new_parent_id)
|
|
|
|
ret_val = DEFAULT
|
|
effect = self.side_effect
|
|
if effect is not None:
|
|
if _is_exception(effect):
|
|
raise effect
|
|
|
|
if not _callable(effect):
|
|
result = next(effect)
|
|
if _is_exception(result):
|
|
raise result
|
|
if result is DEFAULT:
|
|
result = self.return_value
|
|
return result
|
|
|
|
ret_val = effect(*args, **kwargs)
|
|
|
|
if (self._mock_wraps is not None and
|
|
self._mock_return_value is DEFAULT):
|
|
return self._mock_wraps(*args, **kwargs)
|
|
if ret_val is DEFAULT:
|
|
ret_val = self.return_value
|
|
return ret_val
|
|
|
|
|
|
|
|
class Mock(CallableMixin, NonCallableMock):
|
|
"""
|
|
Create a new `Mock` object. `Mock` takes several optional arguments
|
|
that specify the behaviour of the Mock object:
|
|
|
|
* `spec`: This can be either a list of strings or an existing object (a
|
|
class or instance) that acts as the specification for the mock object. If
|
|
you pass in an object then a list of strings is formed by calling dir on
|
|
the object (excluding unsupported magic attributes and methods). Accessing
|
|
any attribute not in this list will raise an `AttributeError`.
|
|
|
|
If `spec` is an object (rather than a list of strings) then
|
|
`mock.__class__` returns the class of the spec object. This allows mocks
|
|
to pass `isinstance` tests.
|
|
|
|
* `spec_set`: A stricter variant of `spec`. If used, attempting to *set*
|
|
or get an attribute on the mock that isn't on the object passed as
|
|
`spec_set` will raise an `AttributeError`.
|
|
|
|
* `side_effect`: A function to be called whenever the Mock is called. See
|
|
the `side_effect` attribute. Useful for raising exceptions or
|
|
dynamically changing return values. The function is called with the same
|
|
arguments as the mock, and unless it returns `DEFAULT`, the return
|
|
value of this function is used as the return value.
|
|
|
|
If `side_effect` is an iterable then each call to the mock will return
|
|
the next value from the iterable. If any of the members of the iterable
|
|
are exceptions they will be raised instead of returned.
|
|
|
|
* `return_value`: The value returned when the mock is called. By default
|
|
this is a new Mock (created on first access). See the
|
|
`return_value` attribute.
|
|
|
|
* `wraps`: Item for the mock object to wrap. If `wraps` is not None then
|
|
calling the Mock will pass the call through to the wrapped object
|
|
(returning the real result). Attribute access on the mock will return a
|
|
Mock object that wraps the corresponding attribute of the wrapped object
|
|
(so attempting to access an attribute that doesn't exist will raise an
|
|
`AttributeError`).
|
|
|
|
If the mock has an explicit `return_value` set then calls are not passed
|
|
to the wrapped object and the `return_value` is returned instead.
|
|
|
|
* `name`: If the mock has a name then it will be used in the repr of the
|
|
mock. This can be useful for debugging. The name is propagated to child
|
|
mocks.
|
|
|
|
Mocks can also be called with arbitrary keyword arguments. These will be
|
|
used to set attributes on the mock after it is created.
|
|
"""
|
|
|
|
|
|
|
|
def _dot_lookup(thing, comp, import_path):
|
|
try:
|
|
return getattr(thing, comp)
|
|
except AttributeError:
|
|
__import__(import_path)
|
|
return getattr(thing, comp)
|
|
|
|
|
|
def _importer(target):
|
|
components = target.split('.')
|
|
import_path = components.pop(0)
|
|
thing = __import__(import_path)
|
|
|
|
for comp in components:
|
|
import_path += ".%s" % comp
|
|
thing = _dot_lookup(thing, comp, import_path)
|
|
return thing
|
|
|
|
|
|
def _is_started(patcher):
|
|
# XXXX horrible
|
|
return hasattr(patcher, 'is_local')
|
|
|
|
|
|
class _patch(object):
|
|
|
|
attribute_name = None
|
|
_active_patches = []
|
|
|
|
def __init__(
|
|
self, getter, attribute, new, spec, create,
|
|
spec_set, autospec, new_callable, kwargs
|
|
):
|
|
if new_callable is not None:
|
|
if new is not DEFAULT:
|
|
raise ValueError(
|
|
"Cannot use 'new' and 'new_callable' together"
|
|
)
|
|
if autospec is not None:
|
|
raise ValueError(
|
|
"Cannot use 'autospec' and 'new_callable' together"
|
|
)
|
|
|
|
self.getter = getter
|
|
self.attribute = attribute
|
|
self.new = new
|
|
self.new_callable = new_callable
|
|
self.spec = spec
|
|
self.create = create
|
|
self.has_local = False
|
|
self.spec_set = spec_set
|
|
self.autospec = autospec
|
|
self.kwargs = kwargs
|
|
self.additional_patchers = []
|
|
|
|
|
|
def copy(self):
|
|
patcher = _patch(
|
|
self.getter, self.attribute, self.new, self.spec,
|
|
self.create, self.spec_set,
|
|
self.autospec, self.new_callable, self.kwargs
|
|
)
|
|
patcher.attribute_name = self.attribute_name
|
|
patcher.additional_patchers = [
|
|
p.copy() for p in self.additional_patchers
|
|
]
|
|
return patcher
|
|
|
|
|
|
def __call__(self, func):
|
|
if isinstance(func, type):
|
|
return self.decorate_class(func)
|
|
return self.decorate_callable(func)
|
|
|
|
|
|
def decorate_class(self, klass):
|
|
for attr in dir(klass):
|
|
if not attr.startswith(patch.TEST_PREFIX):
|
|
continue
|
|
|
|
attr_value = getattr(klass, attr)
|
|
if not hasattr(attr_value, "__call__"):
|
|
continue
|
|
|
|
patcher = self.copy()
|
|
setattr(klass, attr, patcher(attr_value))
|
|
return klass
|
|
|
|
|
|
def decorate_callable(self, func):
|
|
if hasattr(func, 'patchings'):
|
|
func.patchings.append(self)
|
|
return func
|
|
|
|
@wraps(func)
|
|
def patched(*args, **keywargs):
|
|
extra_args = []
|
|
entered_patchers = []
|
|
|
|
exc_info = tuple()
|
|
try:
|
|
for patching in patched.patchings:
|
|
arg = patching.__enter__()
|
|
entered_patchers.append(patching)
|
|
if patching.attribute_name is not None:
|
|
keywargs.update(arg)
|
|
elif patching.new is DEFAULT:
|
|
extra_args.append(arg)
|
|
|
|
args += tuple(extra_args)
|
|
return func(*args, **keywargs)
|
|
except:
|
|
if (patching not in entered_patchers and
|
|
_is_started(patching)):
|
|
# the patcher may have been started, but an exception
|
|
# raised whilst entering one of its additional_patchers
|
|
entered_patchers.append(patching)
|
|
# Pass the exception to __exit__
|
|
exc_info = sys.exc_info()
|
|
# re-raise the exception
|
|
raise
|
|
finally:
|
|
for patching in reversed(entered_patchers):
|
|
patching.__exit__(*exc_info)
|
|
|
|
patched.patchings = [self]
|
|
return patched
|
|
|
|
|
|
def get_original(self):
|
|
target = self.getter()
|
|
name = self.attribute
|
|
|
|
original = DEFAULT
|
|
local = False
|
|
|
|
try:
|
|
original = target.__dict__[name]
|
|
except (AttributeError, KeyError):
|
|
original = getattr(target, name, DEFAULT)
|
|
else:
|
|
local = True
|
|
|
|
if name in _builtins and isinstance(target, ModuleType):
|
|
self.create = True
|
|
|
|
if not self.create and original is DEFAULT:
|
|
raise AttributeError(
|
|
"%s does not have the attribute %r" % (target, name)
|
|
)
|
|
return original, local
|
|
|
|
|
|
def __enter__(self):
|
|
"""Perform the patch."""
|
|
new, spec, spec_set = self.new, self.spec, self.spec_set
|
|
autospec, kwargs = self.autospec, self.kwargs
|
|
new_callable = self.new_callable
|
|
self.target = self.getter()
|
|
|
|
# normalise False to None
|
|
if spec is False:
|
|
spec = None
|
|
if spec_set is False:
|
|
spec_set = None
|
|
if autospec is False:
|
|
autospec = None
|
|
|
|
if spec is not None and autospec is not None:
|
|
raise TypeError("Can't specify spec and autospec")
|
|
if ((spec is not None or autospec is not None) and
|
|
spec_set not in (True, None)):
|
|
raise TypeError("Can't provide explicit spec_set *and* spec or autospec")
|
|
|
|
original, local = self.get_original()
|
|
|
|
if new is DEFAULT and autospec is None:
|
|
inherit = False
|
|
if spec is True:
|
|
# set spec to the object we are replacing
|
|
spec = original
|
|
if spec_set is True:
|
|
spec_set = original
|
|
spec = None
|
|
elif spec is not None:
|
|
if spec_set is True:
|
|
spec_set = spec
|
|
spec = None
|
|
elif spec_set is True:
|
|
spec_set = original
|
|
|
|
if spec is not None or spec_set is not None:
|
|
if original is DEFAULT:
|
|
raise TypeError("Can't use 'spec' with create=True")
|
|
if isinstance(original, type):
|
|
# If we're patching out a class and there is a spec
|
|
inherit = True
|
|
|
|
Klass = MagicMock
|
|
_kwargs = {}
|
|
if new_callable is not None:
|
|
Klass = new_callable
|
|
elif spec is not None or spec_set is not None:
|
|
this_spec = spec
|
|
if spec_set is not None:
|
|
this_spec = spec_set
|
|
if _is_list(this_spec):
|
|
not_callable = '__call__' not in this_spec
|
|
else:
|
|
not_callable = not callable(this_spec)
|
|
if not_callable:
|
|
Klass = NonCallableMagicMock
|
|
|
|
if spec is not None:
|
|
_kwargs['spec'] = spec
|
|
if spec_set is not None:
|
|
_kwargs['spec_set'] = spec_set
|
|
|
|
# add a name to mocks
|
|
if (isinstance(Klass, type) and
|
|
issubclass(Klass, NonCallableMock) and self.attribute):
|
|
_kwargs['name'] = self.attribute
|
|
|
|
_kwargs.update(kwargs)
|
|
new = Klass(**_kwargs)
|
|
|
|
if inherit and _is_instance_mock(new):
|
|
# we can only tell if the instance should be callable if the
|
|
# spec is not a list
|
|
this_spec = spec
|
|
if spec_set is not None:
|
|
this_spec = spec_set
|
|
if (not _is_list(this_spec) and not
|
|
_instance_callable(this_spec)):
|
|
Klass = NonCallableMagicMock
|
|
|
|
_kwargs.pop('name')
|
|
new.return_value = Klass(_new_parent=new, _new_name='()',
|
|
**_kwargs)
|
|
elif autospec is not None:
|
|
# spec is ignored, new *must* be default, spec_set is treated
|
|
# as a boolean. Should we check spec is not None and that spec_set
|
|
# is a bool?
|
|
if new is not DEFAULT:
|
|
raise TypeError(
|
|
"autospec creates the mock for you. Can't specify "
|
|
"autospec and new."
|
|
)
|
|
if original is DEFAULT:
|
|
raise TypeError("Can't use 'autospec' with create=True")
|
|
spec_set = bool(spec_set)
|
|
if autospec is True:
|
|
autospec = original
|
|
|
|
new = create_autospec(autospec, spec_set=spec_set,
|
|
_name=self.attribute, **kwargs)
|
|
elif kwargs:
|
|
# can't set keyword args when we aren't creating the mock
|
|
# XXXX If new is a Mock we could call new.configure_mock(**kwargs)
|
|
raise TypeError("Can't pass kwargs to a mock we aren't creating")
|
|
|
|
new_attr = new
|
|
|
|
self.temp_original = original
|
|
self.is_local = local
|
|
setattr(self.target, self.attribute, new_attr)
|
|
if self.attribute_name is not None:
|
|
extra_args = {}
|
|
if self.new is DEFAULT:
|
|
extra_args[self.attribute_name] = new
|
|
for patching in self.additional_patchers:
|
|
arg = patching.__enter__()
|
|
if patching.new is DEFAULT:
|
|
extra_args.update(arg)
|
|
return extra_args
|
|
|
|
return new
|
|
|
|
|
|
def __exit__(self, *exc_info):
|
|
"""Undo the patch."""
|
|
if not _is_started(self):
|
|
raise RuntimeError('stop called on unstarted patcher')
|
|
|
|
if self.is_local and self.temp_original is not DEFAULT:
|
|
setattr(self.target, self.attribute, self.temp_original)
|
|
else:
|
|
delattr(self.target, self.attribute)
|
|
if not self.create and not hasattr(self.target, self.attribute):
|
|
# needed for proxy objects like django settings
|
|
setattr(self.target, self.attribute, self.temp_original)
|
|
|
|
del self.temp_original
|
|
del self.is_local
|
|
del self.target
|
|
for patcher in reversed(self.additional_patchers):
|
|
if _is_started(patcher):
|
|
patcher.__exit__(*exc_info)
|
|
|
|
|
|
def start(self):
|
|
"""Activate a patch, returning any created mock."""
|
|
result = self.__enter__()
|
|
self._active_patches.append(self)
|
|
return result
|
|
|
|
|
|
def stop(self):
|
|
"""Stop an active patch."""
|
|
try:
|
|
self._active_patches.remove(self)
|
|
except ValueError:
|
|
# If the patch hasn't been started this will fail
|
|
pass
|
|
|
|
return self.__exit__()
|
|
|
|
|
|
|
|
def _get_target(target):
|
|
try:
|
|
target, attribute = target.rsplit('.', 1)
|
|
except (TypeError, ValueError):
|
|
raise TypeError("Need a valid target to patch. You supplied: %r" %
|
|
(target,))
|
|
getter = lambda: _importer(target)
|
|
return getter, attribute
|
|
|
|
|
|
def _patch_object(
|
|
target, attribute, new=DEFAULT, spec=None,
|
|
create=False, spec_set=None, autospec=None,
|
|
new_callable=None, **kwargs
|
|
):
|
|
"""
|
|
patch the named member (`attribute`) on an object (`target`) with a mock
|
|
object.
|
|
|
|
`patch.object` can be used as a decorator, class decorator or a context
|
|
manager. Arguments `new`, `spec`, `create`, `spec_set`,
|
|
`autospec` and `new_callable` have the same meaning as for `patch`. Like
|
|
`patch`, `patch.object` takes arbitrary keyword arguments for configuring
|
|
the mock object it creates.
|
|
|
|
When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
|
|
for choosing which methods to wrap.
|
|
"""
|
|
getter = lambda: target
|
|
return _patch(
|
|
getter, attribute, new, spec, create,
|
|
spec_set, autospec, new_callable, kwargs
|
|
)
|
|
|
|
|
|
def _patch_multiple(target, spec=None, create=False, spec_set=None,
|
|
autospec=None, new_callable=None, **kwargs):
|
|
"""Perform multiple patches in a single call. It takes the object to be
|
|
patched (either as an object or a string to fetch the object by importing)
|
|
and keyword arguments for the patches::
|
|
|
|
with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
|
|
...
|
|
|
|
Use `DEFAULT` as the value if you want `patch.multiple` to create
|
|
mocks for you. In this case the created mocks are passed into a decorated
|
|
function by keyword, and a dictionary is returned when `patch.multiple` is
|
|
used as a context manager.
|
|
|
|
`patch.multiple` can be used as a decorator, class decorator or a context
|
|
manager. The arguments `spec`, `spec_set`, `create`,
|
|
`autospec` and `new_callable` have the same meaning as for `patch`. These
|
|
arguments will be applied to *all* patches done by `patch.multiple`.
|
|
|
|
When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
|
|
for choosing which methods to wrap.
|
|
"""
|
|
if type(target) is str:
|
|
getter = lambda: _importer(target)
|
|
else:
|
|
getter = lambda: target
|
|
|
|
if not kwargs:
|
|
raise ValueError(
|
|
'Must supply at least one keyword argument with patch.multiple'
|
|
)
|
|
# need to wrap in a list for python 3, where items is a view
|
|
items = list(kwargs.items())
|
|
attribute, new = items[0]
|
|
patcher = _patch(
|
|
getter, attribute, new, spec, create, spec_set,
|
|
autospec, new_callable, {}
|
|
)
|
|
patcher.attribute_name = attribute
|
|
for attribute, new in items[1:]:
|
|
this_patcher = _patch(
|
|
getter, attribute, new, spec, create, spec_set,
|
|
autospec, new_callable, {}
|
|
)
|
|
this_patcher.attribute_name = attribute
|
|
patcher.additional_patchers.append(this_patcher)
|
|
return patcher
|
|
|
|
|
|
def patch(
|
|
target, new=DEFAULT, spec=None, create=False,
|
|
spec_set=None, autospec=None, new_callable=None, **kwargs
|
|
):
|
|
"""
|
|
`patch` acts as a function decorator, class decorator or a context
|
|
manager. Inside the body of the function or with statement, the `target`
|
|
is patched with a `new` object. When the function/with statement exits
|
|
the patch is undone.
|
|
|
|
If `new` is omitted, then the target is replaced with a
|
|
`MagicMock`. If `patch` is used as a decorator and `new` is
|
|
omitted, the created mock is passed in as an extra argument to the
|
|
decorated function. If `patch` is used as a context manager the created
|
|
mock is returned by the context manager.
|
|
|
|
`target` should be a string in the form `'package.module.ClassName'`. The
|
|
`target` is imported and the specified object replaced with the `new`
|
|
object, so the `target` must be importable from the environment you are
|
|
calling `patch` from. The target is imported when the decorated function
|
|
is executed, not at decoration time.
|
|
|
|
The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
|
|
if patch is creating one for you.
|
|
|
|
In addition you can pass `spec=True` or `spec_set=True`, which causes
|
|
patch to pass in the object being mocked as the spec/spec_set object.
|
|
|
|
`new_callable` allows you to specify a different class, or callable object,
|
|
that will be called to create the `new` object. By default `MagicMock` is
|
|
used.
|
|
|
|
A more powerful form of `spec` is `autospec`. If you set `autospec=True`
|
|
then the mock with be created with a spec from the object being replaced.
|
|
All attributes of the mock will also have the spec of the corresponding
|
|
attribute of the object being replaced. Methods and functions being
|
|
mocked will have their arguments checked and will raise a `TypeError` if
|
|
they are called with the wrong signature. For mocks replacing a class,
|
|
their return value (the 'instance') will have the same spec as the class.
|
|
|
|
Instead of `autospec=True` you can pass `autospec=some_object` to use an
|
|
arbitrary object as the spec instead of the one being replaced.
|
|
|
|
By default `patch` will fail to replace attributes that don't exist. If
|
|
you pass in `create=True`, and the attribute doesn't exist, patch will
|
|
create the attribute for you when the patched function is called, and
|
|
delete it again afterwards. This is useful for writing tests against
|
|
attributes that your production code creates at runtime. It is off by
|
|
default because it can be dangerous. With it switched on you can write
|
|
passing tests against APIs that don't actually exist!
|
|
|
|
Patch can be used as a `TestCase` class decorator. It works by
|
|
decorating each test method in the class. This reduces the boilerplate
|
|
code when your test methods share a common patchings set. `patch` finds
|
|
tests by looking for method names that start with `patch.TEST_PREFIX`.
|
|
By default this is `test`, which matches the way `unittest` finds tests.
|
|
You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
|
|
|
|
Patch can be used as a context manager, with the with statement. Here the
|
|
patching applies to the indented block after the with statement. If you
|
|
use "as" then the patched object will be bound to the name after the
|
|
"as"; very useful if `patch` is creating a mock object for you.
|
|
|
|
`patch` takes arbitrary keyword arguments. These will be passed to
|
|
the `Mock` (or `new_callable`) on construction.
|
|
|
|
`patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
|
|
available for alternate use-cases.
|
|
"""
|
|
getter, attribute = _get_target(target)
|
|
return _patch(
|
|
getter, attribute, new, spec, create,
|
|
spec_set, autospec, new_callable, kwargs
|
|
)
|
|
|
|
|
|
class _patch_dict(object):
|
|
"""
|
|
Patch a dictionary, or dictionary like object, and restore the dictionary
|
|
to its original state after the test.
|
|
|
|
`in_dict` can be a dictionary or a mapping like container. If it is a
|
|
mapping then it must at least support getting, setting and deleting items
|
|
plus iterating over keys.
|
|
|
|
`in_dict` can also be a string specifying the name of the dictionary, which
|
|
will then be fetched by importing it.
|
|
|
|
`values` can be a dictionary of values to set in the dictionary. `values`
|
|
can also be an iterable of `(key, value)` pairs.
|
|
|
|
If `clear` is True then the dictionary will be cleared before the new
|
|
values are set.
|
|
|
|
`patch.dict` can also be called with arbitrary keyword arguments to set
|
|
values in the dictionary::
|
|
|
|
with patch.dict('sys.modules', mymodule=Mock(), other_module=Mock()):
|
|
...
|
|
|
|
`patch.dict` can be used as a context manager, decorator or class
|
|
decorator. When used as a class decorator `patch.dict` honours
|
|
`patch.TEST_PREFIX` for choosing which methods to wrap.
|
|
"""
|
|
|
|
def __init__(self, in_dict, values=(), clear=False, **kwargs):
|
|
if isinstance(in_dict, str):
|
|
in_dict = _importer(in_dict)
|
|
self.in_dict = in_dict
|
|
# support any argument supported by dict(...) constructor
|
|
self.values = dict(values)
|
|
self.values.update(kwargs)
|
|
self.clear = clear
|
|
self._original = None
|
|
|
|
|
|
def __call__(self, f):
|
|
if isinstance(f, type):
|
|
return self.decorate_class(f)
|
|
@wraps(f)
|
|
def _inner(*args, **kw):
|
|
self._patch_dict()
|
|
try:
|
|
return f(*args, **kw)
|
|
finally:
|
|
self._unpatch_dict()
|
|
|
|
return _inner
|
|
|
|
|
|
def decorate_class(self, klass):
|
|
for attr in dir(klass):
|
|
attr_value = getattr(klass, attr)
|
|
if (attr.startswith(patch.TEST_PREFIX) and
|
|
hasattr(attr_value, "__call__")):
|
|
decorator = _patch_dict(self.in_dict, self.values, self.clear)
|
|
decorated = decorator(attr_value)
|
|
setattr(klass, attr, decorated)
|
|
return klass
|
|
|
|
|
|
def __enter__(self):
|
|
"""Patch the dict."""
|
|
self._patch_dict()
|
|
|
|
|
|
def _patch_dict(self):
|
|
values = self.values
|
|
in_dict = self.in_dict
|
|
clear = self.clear
|
|
|
|
try:
|
|
original = in_dict.copy()
|
|
except AttributeError:
|
|
# dict like object with no copy method
|
|
# must support iteration over keys
|
|
original = {}
|
|
for key in in_dict:
|
|
original[key] = in_dict[key]
|
|
self._original = original
|
|
|
|
if clear:
|
|
_clear_dict(in_dict)
|
|
|
|
try:
|
|
in_dict.update(values)
|
|
except AttributeError:
|
|
# dict like object with no update method
|
|
for key in values:
|
|
in_dict[key] = values[key]
|
|
|
|
|
|
def _unpatch_dict(self):
|
|
in_dict = self.in_dict
|
|
original = self._original
|
|
|
|
_clear_dict(in_dict)
|
|
|
|
try:
|
|
in_dict.update(original)
|
|
except AttributeError:
|
|
for key in original:
|
|
in_dict[key] = original[key]
|
|
|
|
|
|
def __exit__(self, *args):
|
|
"""Unpatch the dict."""
|
|
self._unpatch_dict()
|
|
return False
|
|
|
|
start = __enter__
|
|
stop = __exit__
|
|
|
|
|
|
def _clear_dict(in_dict):
|
|
try:
|
|
in_dict.clear()
|
|
except AttributeError:
|
|
keys = list(in_dict)
|
|
for key in keys:
|
|
del in_dict[key]
|
|
|
|
|
|
def _patch_stopall():
|
|
"""Stop all active patches. LIFO to unroll nested patches."""
|
|
for patch in reversed(_patch._active_patches):
|
|
patch.stop()
|
|
|
|
|
|
patch.object = _patch_object
|
|
patch.dict = _patch_dict
|
|
patch.multiple = _patch_multiple
|
|
patch.stopall = _patch_stopall
|
|
patch.TEST_PREFIX = 'test'
|
|
|
|
magic_methods = (
|
|
"lt le gt ge eq ne "
|
|
"getitem setitem delitem "
|
|
"len contains iter "
|
|
"hash str sizeof "
|
|
"enter exit "
|
|
# we added divmod and rdivmod here instead of numerics
|
|
# because there is no idivmod
|
|
"divmod rdivmod neg pos abs invert "
|
|
"complex int float index "
|
|
"trunc floor ceil "
|
|
"bool next "
|
|
)
|
|
|
|
numerics = (
|
|
"add sub mul matmul div floordiv mod lshift rshift and xor or pow truediv"
|
|
)
|
|
inplace = ' '.join('i%s' % n for n in numerics.split())
|
|
right = ' '.join('r%s' % n for n in numerics.split())
|
|
|
|
# not including __prepare__, __instancecheck__, __subclasscheck__
|
|
# (as they are metaclass methods)
|
|
# __del__ is not supported at all as it causes problems if it exists
|
|
|
|
_non_defaults = {
|
|
'__get__', '__set__', '__delete__', '__reversed__', '__missing__',
|
|
'__reduce__', '__reduce_ex__', '__getinitargs__', '__getnewargs__',
|
|
'__getstate__', '__setstate__', '__getformat__', '__setformat__',
|
|
'__repr__', '__dir__', '__subclasses__', '__format__',
|
|
}
|
|
|
|
|
|
def _get_method(name, func):
|
|
"Turns a callable object (like a mock) into a real function"
|
|
def method(self, *args, **kw):
|
|
return func(self, *args, **kw)
|
|
method.__name__ = name
|
|
return method
|
|
|
|
|
|
_magics = {
|
|
'__%s__' % method for method in
|
|
' '.join([magic_methods, numerics, inplace, right]).split()
|
|
}
|
|
|
|
_all_magics = _magics | _non_defaults
|
|
|
|
_unsupported_magics = {
|
|
'__getattr__', '__setattr__',
|
|
'__init__', '__new__', '__prepare__'
|
|
'__instancecheck__', '__subclasscheck__',
|
|
'__del__'
|
|
}
|
|
|
|
_calculate_return_value = {
|
|
'__hash__': lambda self: object.__hash__(self),
|
|
'__str__': lambda self: object.__str__(self),
|
|
'__sizeof__': lambda self: object.__sizeof__(self),
|
|
}
|
|
|
|
_return_values = {
|
|
'__lt__': NotImplemented,
|
|
'__gt__': NotImplemented,
|
|
'__le__': NotImplemented,
|
|
'__ge__': NotImplemented,
|
|
'__int__': 1,
|
|
'__contains__': False,
|
|
'__len__': 0,
|
|
'__exit__': False,
|
|
'__complex__': 1j,
|
|
'__float__': 1.0,
|
|
'__bool__': True,
|
|
'__index__': 1,
|
|
}
|
|
|
|
|
|
def _get_eq(self):
|
|
def __eq__(other):
|
|
ret_val = self.__eq__._mock_return_value
|
|
if ret_val is not DEFAULT:
|
|
return ret_val
|
|
return self is other
|
|
return __eq__
|
|
|
|
def _get_ne(self):
|
|
def __ne__(other):
|
|
if self.__ne__._mock_return_value is not DEFAULT:
|
|
return DEFAULT
|
|
return self is not other
|
|
return __ne__
|
|
|
|
def _get_iter(self):
|
|
def __iter__():
|
|
ret_val = self.__iter__._mock_return_value
|
|
if ret_val is DEFAULT:
|
|
return iter([])
|
|
# if ret_val was already an iterator, then calling iter on it should
|
|
# return the iterator unchanged
|
|
return iter(ret_val)
|
|
return __iter__
|
|
|
|
_side_effect_methods = {
|
|
'__eq__': _get_eq,
|
|
'__ne__': _get_ne,
|
|
'__iter__': _get_iter,
|
|
}
|
|
|
|
|
|
|
|
def _set_return_value(mock, method, name):
|
|
fixed = _return_values.get(name, DEFAULT)
|
|
if fixed is not DEFAULT:
|
|
method.return_value = fixed
|
|
return
|
|
|
|
return_calulator = _calculate_return_value.get(name)
|
|
if return_calulator is not None:
|
|
try:
|
|
return_value = return_calulator(mock)
|
|
except AttributeError:
|
|
# XXXX why do we return AttributeError here?
|
|
# set it as a side_effect instead?
|
|
return_value = AttributeError(name)
|
|
method.return_value = return_value
|
|
return
|
|
|
|
side_effector = _side_effect_methods.get(name)
|
|
if side_effector is not None:
|
|
method.side_effect = side_effector(mock)
|
|
|
|
|
|
|
|
class MagicMixin(object):
|
|
def __init__(self, *args, **kw):
|
|
self._mock_set_magics() # make magic work for kwargs in init
|
|
_safe_super(MagicMixin, self).__init__(*args, **kw)
|
|
self._mock_set_magics() # fix magic broken by upper level init
|
|
|
|
|
|
def _mock_set_magics(self):
|
|
these_magics = _magics
|
|
|
|
if getattr(self, "_mock_methods", None) is not None:
|
|
these_magics = _magics.intersection(self._mock_methods)
|
|
|
|
remove_magics = set()
|
|
remove_magics = _magics - these_magics
|
|
|
|
for entry in remove_magics:
|
|
if entry in type(self).__dict__:
|
|
# remove unneeded magic methods
|
|
delattr(self, entry)
|
|
|
|
# don't overwrite existing attributes if called a second time
|
|
these_magics = these_magics - set(type(self).__dict__)
|
|
|
|
_type = type(self)
|
|
for entry in these_magics:
|
|
setattr(_type, entry, MagicProxy(entry, self))
|
|
|
|
|
|
|
|
class NonCallableMagicMock(MagicMixin, NonCallableMock):
|
|
"""A version of `MagicMock` that isn't callable."""
|
|
def mock_add_spec(self, spec, spec_set=False):
|
|
"""Add a spec to a mock. `spec` can either be an object or a
|
|
list of strings. Only attributes on the `spec` can be fetched as
|
|
attributes from the mock.
|
|
|
|
If `spec_set` is True then only attributes on the spec can be set."""
|
|
self._mock_add_spec(spec, spec_set)
|
|
self._mock_set_magics()
|
|
|
|
|
|
|
|
class MagicMock(MagicMixin, Mock):
|
|
"""
|
|
MagicMock is a subclass of Mock with default implementations
|
|
of most of the magic methods. You can use MagicMock without having to
|
|
configure the magic methods yourself.
|
|
|
|
If you use the `spec` or `spec_set` arguments then *only* magic
|
|
methods that exist in the spec will be created.
|
|
|
|
Attributes and the return value of a `MagicMock` will also be `MagicMocks`.
|
|
"""
|
|
def mock_add_spec(self, spec, spec_set=False):
|
|
"""Add a spec to a mock. `spec` can either be an object or a
|
|
list of strings. Only attributes on the `spec` can be fetched as
|
|
attributes from the mock.
|
|
|
|
If `spec_set` is True then only attributes on the spec can be set."""
|
|
self._mock_add_spec(spec, spec_set)
|
|
self._mock_set_magics()
|
|
|
|
|
|
|
|
class MagicProxy(object):
|
|
def __init__(self, name, parent):
|
|
self.name = name
|
|
self.parent = parent
|
|
|
|
def __call__(self, *args, **kwargs):
|
|
m = self.create_mock()
|
|
return m(*args, **kwargs)
|
|
|
|
def create_mock(self):
|
|
entry = self.name
|
|
parent = self.parent
|
|
m = parent._get_child_mock(name=entry, _new_name=entry,
|
|
_new_parent=parent)
|
|
setattr(parent, entry, m)
|
|
_set_return_value(parent, m, entry)
|
|
return m
|
|
|
|
def __get__(self, obj, _type=None):
|
|
return self.create_mock()
|
|
|
|
|
|
|
|
class _ANY(object):
|
|
"A helper object that compares equal to everything."
|
|
|
|
def __eq__(self, other):
|
|
return True
|
|
|
|
def __ne__(self, other):
|
|
return False
|
|
|
|
def __repr__(self):
|
|
return '<ANY>'
|
|
|
|
ANY = _ANY()
|
|
|
|
|
|
|
|
def _format_call_signature(name, args, kwargs):
|
|
message = '%s(%%s)' % name
|
|
formatted_args = ''
|
|
args_string = ', '.join([repr(arg) for arg in args])
|
|
kwargs_string = ', '.join([
|
|
'%s=%r' % (key, value) for key, value in sorted(kwargs.items())
|
|
])
|
|
if args_string:
|
|
formatted_args = args_string
|
|
if kwargs_string:
|
|
if formatted_args:
|
|
formatted_args += ', '
|
|
formatted_args += kwargs_string
|
|
|
|
return message % formatted_args
|
|
|
|
|
|
|
|
class _Call(tuple):
|
|
"""
|
|
A tuple for holding the results of a call to a mock, either in the form
|
|
`(args, kwargs)` or `(name, args, kwargs)`.
|
|
|
|
If args or kwargs are empty then a call tuple will compare equal to
|
|
a tuple without those values. This makes comparisons less verbose::
|
|
|
|
_Call(('name', (), {})) == ('name',)
|
|
_Call(('name', (1,), {})) == ('name', (1,))
|
|
_Call(((), {'a': 'b'})) == ({'a': 'b'},)
|
|
|
|
The `_Call` object provides a useful shortcut for comparing with call::
|
|
|
|
_Call(((1, 2), {'a': 3})) == call(1, 2, a=3)
|
|
_Call(('foo', (1, 2), {'a': 3})) == call.foo(1, 2, a=3)
|
|
|
|
If the _Call has no name then it will match any name.
|
|
"""
|
|
def __new__(cls, value=(), name=None, parent=None, two=False,
|
|
from_kall=True):
|
|
name = ''
|
|
args = ()
|
|
kwargs = {}
|
|
_len = len(value)
|
|
if _len == 3:
|
|
name, args, kwargs = value
|
|
elif _len == 2:
|
|
first, second = value
|
|
if isinstance(first, str):
|
|
name = first
|
|
if isinstance(second, tuple):
|
|
args = second
|
|
else:
|
|
kwargs = second
|
|
else:
|
|
args, kwargs = first, second
|
|
elif _len == 1:
|
|
value, = value
|
|
if isinstance(value, str):
|
|
name = value
|
|
elif isinstance(value, tuple):
|
|
args = value
|
|
else:
|
|
kwargs = value
|
|
|
|
if two:
|
|
return tuple.__new__(cls, (args, kwargs))
|
|
|
|
return tuple.__new__(cls, (name, args, kwargs))
|
|
|
|
|
|
def __init__(self, value=(), name=None, parent=None, two=False,
|
|
from_kall=True):
|
|
self.name = name
|
|
self.parent = parent
|
|
self.from_kall = from_kall
|
|
|
|
|
|
def __eq__(self, other):
|
|
if other is ANY:
|
|
return True
|
|
try:
|
|
len_other = len(other)
|
|
except TypeError:
|
|
return False
|
|
|
|
self_name = ''
|
|
if len(self) == 2:
|
|
self_args, self_kwargs = self
|
|
else:
|
|
self_name, self_args, self_kwargs = self
|
|
|
|
other_name = ''
|
|
if len_other == 0:
|
|
other_args, other_kwargs = (), {}
|
|
elif len_other == 3:
|
|
other_name, other_args, other_kwargs = other
|
|
elif len_other == 1:
|
|
value, = other
|
|
if isinstance(value, tuple):
|
|
other_args = value
|
|
other_kwargs = {}
|
|
elif isinstance(value, str):
|
|
other_name = value
|
|
other_args, other_kwargs = (), {}
|
|
else:
|
|
other_args = ()
|
|
other_kwargs = value
|
|
else:
|
|
# len 2
|
|
# could be (name, args) or (name, kwargs) or (args, kwargs)
|
|
first, second = other
|
|
if isinstance(first, str):
|
|
other_name = first
|
|
if isinstance(second, tuple):
|
|
other_args, other_kwargs = second, {}
|
|
else:
|
|
other_args, other_kwargs = (), second
|
|
else:
|
|
other_args, other_kwargs = first, second
|
|
|
|
if self_name and other_name != self_name:
|
|
return False
|
|
|
|
# this order is important for ANY to work!
|
|
return (other_args, other_kwargs) == (self_args, self_kwargs)
|
|
|
|
|
|
def __call__(self, *args, **kwargs):
|
|
if self.name is None:
|
|
return _Call(('', args, kwargs), name='()')
|
|
|
|
name = self.name + '()'
|
|
return _Call((self.name, args, kwargs), name=name, parent=self)
|
|
|
|
|
|
def __getattr__(self, attr):
|
|
if self.name is None:
|
|
return _Call(name=attr, from_kall=False)
|
|
name = '%s.%s' % (self.name, attr)
|
|
return _Call(name=name, parent=self, from_kall=False)
|
|
|
|
|
|
def count(self, *args, **kwargs):
|
|
return self.__getattr__('count')(*args, **kwargs)
|
|
|
|
def index(self, *args, **kwargs):
|
|
return self.__getattr__('index')(*args, **kwargs)
|
|
|
|
def __repr__(self):
|
|
if not self.from_kall:
|
|
name = self.name or 'call'
|
|
if name.startswith('()'):
|
|
name = 'call%s' % name
|
|
return name
|
|
|
|
if len(self) == 2:
|
|
name = 'call'
|
|
args, kwargs = self
|
|
else:
|
|
name, args, kwargs = self
|
|
if not name:
|
|
name = 'call'
|
|
elif not name.startswith('()'):
|
|
name = 'call.%s' % name
|
|
else:
|
|
name = 'call%s' % name
|
|
return _format_call_signature(name, args, kwargs)
|
|
|
|
|
|
def call_list(self):
|
|
"""For a call object that represents multiple calls, `call_list`
|
|
returns a list of all the intermediate calls as well as the
|
|
final call."""
|
|
vals = []
|
|
thing = self
|
|
while thing is not None:
|
|
if thing.from_kall:
|
|
vals.append(thing)
|
|
thing = thing.parent
|
|
return _CallList(reversed(vals))
|
|
|
|
|
|
call = _Call(from_kall=False)
|
|
|
|
|
|
|
|
def create_autospec(spec, spec_set=False, instance=False, _parent=None,
|
|
_name=None, **kwargs):
|
|
"""Create a mock object using another object as a spec. Attributes on the
|
|
mock will use the corresponding attribute on the `spec` object as their
|
|
spec.
|
|
|
|
Functions or methods being mocked will have their arguments checked
|
|
to check that they are called with the correct signature.
|
|
|
|
If `spec_set` is True then attempting to set attributes that don't exist
|
|
on the spec object will raise an `AttributeError`.
|
|
|
|
If a class is used as a spec then the return value of the mock (the
|
|
instance of the class) will have the same spec. You can use a class as the
|
|
spec for an instance object by passing `instance=True`. The returned mock
|
|
will only be callable if instances of the mock are callable.
|
|
|
|
`create_autospec` also takes arbitrary keyword arguments that are passed to
|
|
the constructor of the created mock."""
|
|
if _is_list(spec):
|
|
# can't pass a list instance to the mock constructor as it will be
|
|
# interpreted as a list of strings
|
|
spec = type(spec)
|
|
|
|
is_type = isinstance(spec, type)
|
|
|
|
_kwargs = {'spec': spec}
|
|
if spec_set:
|
|
_kwargs = {'spec_set': spec}
|
|
elif spec is None:
|
|
# None we mock with a normal mock without a spec
|
|
_kwargs = {}
|
|
if _kwargs and instance:
|
|
_kwargs['_spec_as_instance'] = True
|
|
|
|
_kwargs.update(kwargs)
|
|
|
|
Klass = MagicMock
|
|
if type(spec) in DescriptorTypes:
|
|
# descriptors don't have a spec
|
|
# because we don't know what type they return
|
|
_kwargs = {}
|
|
elif not _callable(spec):
|
|
Klass = NonCallableMagicMock
|
|
elif is_type and instance and not _instance_callable(spec):
|
|
Klass = NonCallableMagicMock
|
|
|
|
_name = _kwargs.pop('name', _name)
|
|
|
|
_new_name = _name
|
|
if _parent is None:
|
|
# for a top level object no _new_name should be set
|
|
_new_name = ''
|
|
|
|
mock = Klass(parent=_parent, _new_parent=_parent, _new_name=_new_name,
|
|
name=_name, **_kwargs)
|
|
|
|
if isinstance(spec, FunctionTypes):
|
|
# should only happen at the top level because we don't
|
|
# recurse for functions
|
|
mock = _set_signature(mock, spec)
|
|
else:
|
|
_check_signature(spec, mock, is_type, instance)
|
|
|
|
if _parent is not None and not instance:
|
|
_parent._mock_children[_name] = mock
|
|
|
|
if is_type and not instance and 'return_value' not in kwargs:
|
|
mock.return_value = create_autospec(spec, spec_set, instance=True,
|
|
_name='()', _parent=mock)
|
|
|
|
for entry in dir(spec):
|
|
if _is_magic(entry):
|
|
# MagicMock already does the useful magic methods for us
|
|
continue
|
|
|
|
# XXXX do we need a better way of getting attributes without
|
|
# triggering code execution (?) Probably not - we need the actual
|
|
# object to mock it so we would rather trigger a property than mock
|
|
# the property descriptor. Likewise we want to mock out dynamically
|
|
# provided attributes.
|
|
# XXXX what about attributes that raise exceptions other than
|
|
# AttributeError on being fetched?
|
|
# we could be resilient against it, or catch and propagate the
|
|
# exception when the attribute is fetched from the mock
|
|
try:
|
|
original = getattr(spec, entry)
|
|
except AttributeError:
|
|
continue
|
|
|
|
kwargs = {'spec': original}
|
|
if spec_set:
|
|
kwargs = {'spec_set': original}
|
|
|
|
if not isinstance(original, FunctionTypes):
|
|
new = _SpecState(original, spec_set, mock, entry, instance)
|
|
mock._mock_children[entry] = new
|
|
else:
|
|
parent = mock
|
|
if isinstance(spec, FunctionTypes):
|
|
parent = mock.mock
|
|
|
|
skipfirst = _must_skip(spec, entry, is_type)
|
|
kwargs['_eat_self'] = skipfirst
|
|
new = MagicMock(parent=parent, name=entry, _new_name=entry,
|
|
_new_parent=parent,
|
|
**kwargs)
|
|
mock._mock_children[entry] = new
|
|
_check_signature(original, new, skipfirst=skipfirst)
|
|
|
|
# so functions created with _set_signature become instance attributes,
|
|
# *plus* their underlying mock exists in _mock_children of the parent
|
|
# mock. Adding to _mock_children may be unnecessary where we are also
|
|
# setting as an instance attribute?
|
|
if isinstance(new, FunctionTypes):
|
|
setattr(mock, entry, new)
|
|
|
|
return mock
|
|
|
|
|
|
def _must_skip(spec, entry, is_type):
|
|
"""
|
|
Return whether we should skip the first argument on spec's `entry`
|
|
attribute.
|
|
"""
|
|
if not isinstance(spec, type):
|
|
if entry in getattr(spec, '__dict__', {}):
|
|
# instance attribute - shouldn't skip
|
|
return False
|
|
spec = spec.__class__
|
|
|
|
for klass in spec.__mro__:
|
|
result = klass.__dict__.get(entry, DEFAULT)
|
|
if result is DEFAULT:
|
|
continue
|
|
if isinstance(result, (staticmethod, classmethod)):
|
|
return False
|
|
elif isinstance(getattr(result, '__get__', None), MethodWrapperTypes):
|
|
# Normal method => skip if looked up on type
|
|
# (if looked up on instance, self is already skipped)
|
|
return is_type
|
|
else:
|
|
return False
|
|
|
|
# shouldn't get here unless function is a dynamically provided attribute
|
|
# XXXX untested behaviour
|
|
return is_type
|
|
|
|
|
|
def _get_class(obj):
|
|
try:
|
|
return obj.__class__
|
|
except AttributeError:
|
|
# it is possible for objects to have no __class__
|
|
return type(obj)
|
|
|
|
|
|
class _SpecState(object):
|
|
|
|
def __init__(self, spec, spec_set=False, parent=None,
|
|
name=None, ids=None, instance=False):
|
|
self.spec = spec
|
|
self.ids = ids
|
|
self.spec_set = spec_set
|
|
self.parent = parent
|
|
self.instance = instance
|
|
self.name = name
|
|
|
|
|
|
FunctionTypes = (
|
|
# python function
|
|
type(create_autospec),
|
|
# instance method
|
|
type(ANY.__eq__),
|
|
)
|
|
|
|
MethodWrapperTypes = (
|
|
type(ANY.__eq__.__get__),
|
|
)
|
|
|
|
|
|
file_spec = None
|
|
|
|
def _iterate_read_data(read_data):
|
|
# Helper for mock_open:
|
|
# Retrieve lines from read_data via a generator so that separate calls to
|
|
# readline, read, and readlines are properly interleaved
|
|
data_as_list = ['{}\n'.format(l) for l in read_data.split('\n')]
|
|
|
|
if data_as_list[-1] == '\n':
|
|
# If the last line ended in a newline, the list comprehension will have an
|
|
# extra entry that's just a newline. Remove this.
|
|
data_as_list = data_as_list[:-1]
|
|
else:
|
|
# If there wasn't an extra newline by itself, then the file being
|
|
# emulated doesn't have a newline to end the last line remove the
|
|
# newline that our naive format() added
|
|
data_as_list[-1] = data_as_list[-1][:-1]
|
|
|
|
for line in data_as_list:
|
|
yield line
|
|
|
|
def mock_open(mock=None, read_data=''):
|
|
"""
|
|
A helper function to create a mock to replace the use of `open`. It works
|
|
for `open` called directly or used as a context manager.
|
|
|
|
The `mock` argument is the mock object to configure. If `None` (the
|
|
default) then a `MagicMock` will be created for you, with the API limited
|
|
to methods or attributes available on standard file handles.
|
|
|
|
`read_data` is a string for the `read` methoddline`, and `readlines` of the
|
|
file handle to return. This is an empty string by default.
|
|
"""
|
|
def _readlines_side_effect(*args, **kwargs):
|
|
if handle.readlines.return_value is not None:
|
|
return handle.readlines.return_value
|
|
return list(_data)
|
|
|
|
def _read_side_effect(*args, **kwargs):
|
|
if handle.read.return_value is not None:
|
|
return handle.read.return_value
|
|
return ''.join(_data)
|
|
|
|
def _readline_side_effect():
|
|
if handle.readline.return_value is not None:
|
|
while True:
|
|
yield handle.readline.return_value
|
|
for line in _data:
|
|
yield line
|
|
|
|
|
|
global file_spec
|
|
if file_spec is None:
|
|
import _io
|
|
file_spec = list(set(dir(_io.TextIOWrapper)).union(set(dir(_io.BytesIO))))
|
|
|
|
if mock is None:
|
|
mock = MagicMock(name='open', spec=open)
|
|
|
|
handle = MagicMock(spec=file_spec)
|
|
handle.__enter__.return_value = handle
|
|
|
|
_data = _iterate_read_data(read_data)
|
|
|
|
handle.write.return_value = None
|
|
handle.read.return_value = None
|
|
handle.readline.return_value = None
|
|
handle.readlines.return_value = None
|
|
|
|
handle.read.side_effect = _read_side_effect
|
|
handle.readline.side_effect = _readline_side_effect()
|
|
handle.readlines.side_effect = _readlines_side_effect
|
|
|
|
mock.return_value = handle
|
|
return mock
|
|
|
|
|
|
class PropertyMock(Mock):
|
|
"""
|
|
A mock intended to be used as a property, or other descriptor, on a class.
|
|
`PropertyMock` provides `__get__` and `__set__` methods so you can specify
|
|
a return value when it is fetched.
|
|
|
|
Fetching a `PropertyMock` instance from an object calls the mock, with
|
|
no args. Setting it calls the mock with the value being set.
|
|
"""
|
|
def _get_child_mock(self, **kwargs):
|
|
return MagicMock(**kwargs)
|
|
|
|
def __get__(self, obj, obj_type):
|
|
return self()
|
|
def __set__(self, obj, val):
|
|
self(val)
|