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raises.py
from weakref import ref import re import sys from hamcrest.core.base_matcher import BaseMatcher from hamcrest.core.compat import is_callable __author__ = "Per Fagrell" __copyright__ = "Copyright 2013 hamcrest.org" __license__ = "BSD, see License.txt" class Raises(BaseMatcher): def __init__(self, expected, pattern=None): self.pattern = pattern self.expected = expected self.actual = None self.function = None def _matches(self, function): if not is_callable(function): return False self.function = ref(function) return self._call_function(function) def _call_function(self, function): self.actual = None try: function() except Exception: self.actual = sys.exc_info()[1] if isinstance(self.actual, self.expected): if self.pattern is not None: return re.search(self.pattern, str(self.actual)) is not None return True return False def describe_to(self, description): description.append_text('Expected a callable raising %s' % self.expected) def describe_mismatch(self, item, description): if not is_callable(item): description.append_text('%s is not callable' % item) return function = None if self.function is None else self.function() if function is None or function is not item: self.function = ref(item) if not self._call_function(item): return if self.actual is None: description.append_text('No exception raised.') elif isinstance(self.actual, self.expected) and self.pattern is not None: description.append_text('Correct assertion type raised, but the expected pattern ("%s") not found.' % self.pattern) description.append_text('\n message was: "%s"' % str(self.actual)) else: description.append_text('%s was raised instead' % type(self.actual)) def raises(exception, pattern=None): """Matches if the called function raised the expected exception. :param exception: The class of the expected exception :param pattern: Optional regular expression to match exception message. Expects the actual to be wrapped by using :py:func:`~hamcrest.core.core.raises.calling`, or a callable taking no arguments. Optional argument pattern should be a string containing a regular expression. If provided, the string representation of the actual exception - e.g. `str(actual)` - must match pattern. Examples:: assert_that(calling(int).with_args('q'), raises(TypeError)) assert_that(calling(parse, broken_input), raises(ValueError)) """ return Raises(exception, pattern) class DeferredCallable(object): def __init__(self, func): self.func = func self.args = tuple() self.kwargs = {} def __call__(self): return self.func(*self.args, **self.kwargs) def with_args(self, *args, **kwargs): self.args = args self.kwargs = kwargs return self def calling(func): """Wrapper for function call that delays the actual execution so that :py:func:`~hamcrest.core.core.raises.raises` matcher can catch any thrown exception. :param func: The function or method to be called The arguments can be provided with a call to the `with_args` function on the returned object:: calling(my_method).with_args(arguments, and_='keywords') """ return DeferredCallable(func)
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