96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
""" recording warnings during test function execution. """
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import sys
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import warnings
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def pytest_funcarg__recwarn(request):
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"""Return a WarningsRecorder instance that provides these methods:
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* ``pop(category=None)``: return last warning matching the category.
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* ``clear()``: clear list of warnings
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See http://docs.python.org/library/warnings.html for information
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on warning categories.
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"""
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if sys.version_info >= (2,7):
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oldfilters = warnings.filters[:]
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warnings.simplefilter('default')
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def reset_filters():
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warnings.filters[:] = oldfilters
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request.addfinalizer(reset_filters)
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wrec = WarningsRecorder()
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request.addfinalizer(wrec.finalize)
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return wrec
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def pytest_namespace():
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return {'deprecated_call': deprecated_call}
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def deprecated_call(func, *args, **kwargs):
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""" assert that calling ``func(*args, **kwargs)``
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triggers a DeprecationWarning.
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"""
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l = []
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oldwarn_explicit = getattr(warnings, 'warn_explicit')
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def warn_explicit(*args, **kwargs):
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l.append(args)
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oldwarn_explicit(*args, **kwargs)
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oldwarn = getattr(warnings, 'warn')
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def warn(*args, **kwargs):
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l.append(args)
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oldwarn(*args, **kwargs)
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warnings.warn_explicit = warn_explicit
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warnings.warn = warn
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try:
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ret = func(*args, **kwargs)
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finally:
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warnings.warn_explicit = warn_explicit
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warnings.warn = warn
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if not l:
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__tracebackhide__ = True
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raise AssertionError("%r did not produce DeprecationWarning" %(func,))
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return ret
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class RecordedWarning:
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def __init__(self, message, category, filename, lineno, line):
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self.message = message
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self.category = category
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self.filename = filename
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self.lineno = lineno
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self.line = line
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class WarningsRecorder:
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def __init__(self):
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self.list = []
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def showwarning(message, category, filename, lineno, line=0):
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self.list.append(RecordedWarning(
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message, category, filename, lineno, line))
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try:
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self.old_showwarning(message, category,
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filename, lineno, line=line)
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except TypeError:
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# < python2.6
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self.old_showwarning(message, category, filename, lineno)
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self.old_showwarning = warnings.showwarning
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warnings.showwarning = showwarning
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def pop(self, cls=Warning):
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""" pop the first recorded warning, raise exception if not exists."""
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for i, w in enumerate(self.list):
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if issubclass(w.category, cls):
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return self.list.pop(i)
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__tracebackhide__ = True
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assert 0, "%r not found in %r" %(cls, self.list)
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#def resetregistry(self):
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# warnings.onceregistry.clear()
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# warnings.__warningregistry__.clear()
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def clear(self):
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self.list[:] = []
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def finalize(self):
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warnings.showwarning = self.old_showwarning
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