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Diffstat (limited to 'src/third_party/wiredtiger/test/3rdparty/testtools-0.9.34/testtools/matchers/_impl.py')
| -rw-r--r-- | src/third_party/wiredtiger/test/3rdparty/testtools-0.9.34/testtools/matchers/_impl.py | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/test/3rdparty/testtools-0.9.34/testtools/matchers/_impl.py b/src/third_party/wiredtiger/test/3rdparty/testtools-0.9.34/testtools/matchers/_impl.py new file mode 100644 index 00000000000..36e5ee02218 --- /dev/null +++ b/src/third_party/wiredtiger/test/3rdparty/testtools-0.9.34/testtools/matchers/_impl.py @@ -0,0 +1,175 @@ +# Copyright (c) 2009-2012 testtools developers. See LICENSE for details. + +"""Matchers, a way to express complex assertions outside the testcase. + +Inspired by 'hamcrest'. + +Matcher provides the abstract API that all matchers need to implement. + +Bundled matchers are listed in __all__: a list can be obtained by running +$ python -c 'import testtools.matchers; print testtools.matchers.__all__' +""" + +__all__ = [ + 'Matcher', + 'Mismatch', + 'MismatchDecorator', + 'MismatchError', + ] + +from testtools.compat import ( + _isbytes, + istext, + str_is_unicode, + text_repr + ) + + +class Matcher(object): + """A pattern matcher. + + A Matcher must implement match and __str__ to be used by + testtools.TestCase.assertThat. Matcher.match(thing) returns None when + thing is completely matched, and a Mismatch object otherwise. + + Matchers can be useful outside of test cases, as they are simply a + pattern matching language expressed as objects. + + testtools.matchers is inspired by hamcrest, but is pythonic rather than + a Java transcription. + """ + + def match(self, something): + """Return None if this matcher matches something, a Mismatch otherwise. + """ + raise NotImplementedError(self.match) + + def __str__(self): + """Get a sensible human representation of the matcher. + + This should include the parameters given to the matcher and any + state that would affect the matches operation. + """ + raise NotImplementedError(self.__str__) + + +class Mismatch(object): + """An object describing a mismatch detected by a Matcher.""" + + def __init__(self, description=None, details=None): + """Construct a `Mismatch`. + + :param description: A description to use. If not provided, + `Mismatch.describe` must be implemented. + :param details: Extra details about the mismatch. Defaults + to the empty dict. + """ + if description: + self._description = description + if details is None: + details = {} + self._details = details + + def describe(self): + """Describe the mismatch. + + This should be either a human-readable string or castable to a string. + In particular, is should either be plain ascii or unicode on Python 2, + and care should be taken to escape control characters. + """ + try: + return self._description + except AttributeError: + raise NotImplementedError(self.describe) + + def get_details(self): + """Get extra details about the mismatch. + + This allows the mismatch to provide extra information beyond the basic + description, including large text or binary files, or debugging internals + without having to force it to fit in the output of 'describe'. + + The testtools assertion assertThat will query get_details and attach + all its values to the test, permitting them to be reported in whatever + manner the test environment chooses. + + :return: a dict mapping names to Content objects. name is a string to + name the detail, and the Content object is the detail to add + to the result. For more information see the API to which items from + this dict are passed testtools.TestCase.addDetail. + """ + return getattr(self, '_details', {}) + + def __repr__(self): + return "<testtools.matchers.Mismatch object at %x attributes=%r>" % ( + id(self), self.__dict__) + + +class MismatchError(AssertionError): + """Raised when a mismatch occurs.""" + + # This class exists to work around + # <https://bugs.launchpad.net/testtools/+bug/804127>. It provides a + # guaranteed way of getting a readable exception, no matter what crazy + # characters are in the matchee, matcher or mismatch. + + def __init__(self, matchee, matcher, mismatch, verbose=False): + # Have to use old-style upcalling for Python 2.4 and 2.5 + # compatibility. + AssertionError.__init__(self) + self.matchee = matchee + self.matcher = matcher + self.mismatch = mismatch + self.verbose = verbose + + def __str__(self): + difference = self.mismatch.describe() + if self.verbose: + # GZ 2011-08-24: Smelly API? Better to take any object and special + # case text inside? + if istext(self.matchee) or _isbytes(self.matchee): + matchee = text_repr(self.matchee, multiline=False) + else: + matchee = repr(self.matchee) + return ( + 'Match failed. Matchee: %s\nMatcher: %s\nDifference: %s\n' + % (matchee, self.matcher, difference)) + else: + return difference + + if not str_is_unicode: + + __unicode__ = __str__ + + def __str__(self): + return self.__unicode__().encode("ascii", "backslashreplace") + + +class MismatchDecorator(object): + """Decorate a ``Mismatch``. + + Forwards all messages to the original mismatch object. Probably the best + way to use this is inherit from this class and then provide your own + custom decoration logic. + """ + + def __init__(self, original): + """Construct a `MismatchDecorator`. + + :param original: A `Mismatch` object to decorate. + """ + self.original = original + + def __repr__(self): + return '<testtools.matchers.MismatchDecorator(%r)>' % (self.original,) + + def describe(self): + return self.original.describe() + + def get_details(self): + return self.original.get_details() + + +# Signal that this is part of the testing framework, and that code from this +# should not normally appear in tracebacks. +__unittest = True |