mirror of
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142 lines
4.5 KiB
Python
142 lines
4.5 KiB
Python
from functools import partial
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from testfixtures.compat import ClassType
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from testfixtures.resolve import resolve, not_there
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from testfixtures.utils import wrap, extend_docstring
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import warnings
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def not_same_descriptor(x, y, descriptor):
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return isinstance(x, descriptor) and not isinstance(y, descriptor)
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class Replacer:
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"""
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These are used to manage the mocking out of objects so that units
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of code can be tested without having to rely on their normal
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dependencies.
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"""
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def __init__(self):
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self.originals = {}
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def _replace(self, container, name, method, value, strict=True):
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if value is not_there:
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if method == 'a':
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try:
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delattr(container, name)
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except AttributeError:
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pass
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if method == 'i':
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try:
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del container[name]
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except KeyError:
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pass
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else:
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if method == 'a':
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setattr(container, name, value)
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if method == 'i':
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container[name] = value
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def __call__(self, target, replacement, strict=True):
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"""
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Replace the specified target with the supplied replacement.
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"""
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container, method, attribute, t_obj = resolve(target)
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if method is None:
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raise ValueError('target must contain at least one dot!')
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if t_obj is not_there and strict:
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raise AttributeError('Original %r not found' % attribute)
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replacement_to_use = replacement
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if isinstance(container, (type, ClassType)):
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if not_same_descriptor(t_obj, replacement, classmethod):
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replacement_to_use = classmethod(replacement)
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elif not_same_descriptor(t_obj, replacement, staticmethod):
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replacement_to_use = staticmethod(replacement)
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self._replace(container, attribute, method, replacement_to_use, strict)
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if target not in self.originals:
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self.originals[target] = t_obj
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return replacement
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def replace(self, target, replacement, strict=True):
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"""
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Replace the specified target with the supplied replacement.
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"""
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self(target, replacement, strict)
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def restore(self):
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"""
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Restore all the original objects that have been replaced by
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calls to the :meth:`replace` method of this :class:`Replacer`.
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"""
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for target, original in tuple(self.originals.items()):
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container, method, attribute, found = resolve(target)
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self._replace(container, attribute, method, original, strict=False)
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del self.originals[target]
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.restore()
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def __del__(self):
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if self.originals:
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# no idea why coverage misses the following statement
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# it's covered by test_replace.TestReplace.test_replacer_del
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warnings.warn( # pragma: no cover
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'Replacer deleted without being restored, '
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'originals left: %r' % self.originals
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)
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def replace(target, replacement, strict=True):
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"""
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A decorator to replace a target object for the duration of a test
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function.
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"""
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r = Replacer()
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return wrap(partial(r.__call__, target, replacement, strict), r.restore)
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class Replace(object):
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"""
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A context manager that uses a :class:`Replacer` to replace a single target.
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"""
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def __init__(self, target, replacement, strict=True):
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self.target = target
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self.replacement = replacement
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self.strict = strict
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self._replacer = Replacer()
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def __enter__(self):
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return self._replacer(self.target, self.replacement, self.strict)
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._replacer.restore()
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replace_params_doc = """
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:param target: A string containing the dotted-path to the
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object to be replaced. This path may specify a
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module in a package, an attribute of a module,
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or any attribute of something contained within
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a module.
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:param replacement: The object to use as a replacement.
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:param strict: When `True`, an exception will be raised if an
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attempt is made to replace an object that does
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not exist.
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"""
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# add the param docs, so we only have one copy of them!
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extend_docstring(replace_params_doc,
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[Replacer.__call__, Replacer.replace, replace, Replace])
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