94 lines
3.0 KiB
Python
94 lines
3.0 KiB
Python
"""
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provides "recwarn" funcarg for asserting warnings to be shown
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to a user. See the test at the bottom for an example.
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"""
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import py
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import os
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def pytest_funcarg__recwarn(request):
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""" check that warnings have been raised. """
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warnings = WarningsRecorder()
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request.addfinalizer(warnings.finalize)
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return warnings
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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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warningmodule = py.std.warnings
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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 = warningmodule.showwarning
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warningmodule.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 py.builtin.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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# import warnings
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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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py.std.warnings.showwarning = self.old_showwarning
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def test_WarningRecorder():
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showwarning = py.std.warnings.showwarning
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rec = WarningsRecorder()
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assert py.std.warnings.showwarning != showwarning
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assert not rec.list
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py.std.warnings.warn_explicit("hello", UserWarning, "xyz", 13)
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assert len(rec.list) == 1
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py.std.warnings.warn(DeprecationWarning("hello"))
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assert len(rec.list) == 2
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warn = rec.pop()
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assert str(warn.message) == "hello"
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l = rec.list
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rec.clear()
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assert len(rec.list) == 0
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assert l is rec.list
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py.test.raises(AssertionError, "rec.pop()")
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rec.finalize()
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assert showwarning == py.std.warnings.showwarning
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def test_recwarn_functional(testdir):
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sorter = testdir.inline_runsource("""
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pytest_plugins = 'pytest_recwarn',
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import warnings
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oldwarn = warnings.showwarning
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def test_method(recwarn):
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assert warnings.showwarning != oldwarn
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warnings.warn("hello")
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warn = recwarn.pop()
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assert isinstance(warn.message, UserWarning)
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def test_finalized():
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assert warnings.showwarning == oldwarn
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""")
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res = sorter.countoutcomes()
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assert tuple(res) == (2, 0, 0), res
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