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92 lines
3.2 KiB
Python
92 lines
3.2 KiB
Python
import warnings
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import os
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import unittest
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from test import test_support
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# The warnings module isn't easily tested, because it relies on module
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# globals to store configuration information. setUp() and tearDown()
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# preserve the current settings to avoid bashing them while running tests.
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# To capture the warning messages, a replacement for showwarning() is
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# used to save warning information in a global variable.
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class WarningMessage:
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"Holds results of latest showwarning() call"
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pass
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def showwarning(message, category, filename, lineno, file=None):
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msg.message = str(message)
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msg.category = category.__name__
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msg.filename = os.path.basename(filename)
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msg.lineno = lineno
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class TestModule(unittest.TestCase):
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def setUp(self):
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global msg
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msg = WarningMessage()
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self._filters = warnings.filters[:]
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self._showwarning = warnings.showwarning
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warnings.showwarning = showwarning
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self.ignored = [w[2].__name__ for w in self._filters
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if w[0]=='ignore' and w[1] is None and w[3] is None]
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def tearDown(self):
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warnings.filters = self._filters[:]
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warnings.showwarning = self._showwarning
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def test_warn_default_category(self):
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for i in range(4):
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text = 'multi %d' %i # Different text on each call
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warnings.warn(text)
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self.assertEqual(msg.message, text)
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self.assertEqual(msg.category, 'UserWarning')
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def test_warn_specific_category(self):
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text = 'None'
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for category in [DeprecationWarning, FutureWarning,
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PendingDeprecationWarning, RuntimeWarning,
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SyntaxWarning, UserWarning, Warning]:
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if category.__name__ in self.ignored:
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text = 'filtered out' + category.__name__
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warnings.warn(text, category)
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self.assertNotEqual(msg.message, text)
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else:
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text = 'unfiltered %s' % category.__name__
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warnings.warn(text, category)
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self.assertEqual(msg.message, text)
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self.assertEqual(msg.category, category.__name__)
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def test_filtering(self):
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warnings.filterwarnings("error", "", Warning, "", 0)
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self.assertRaises(UserWarning, warnings.warn, 'convert to error')
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warnings.resetwarnings()
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text = 'handle normally'
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warnings.warn(text)
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self.assertEqual(msg.message, text)
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self.assertEqual(msg.category, 'UserWarning')
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warnings.filterwarnings("ignore", "", Warning, "", 0)
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text = 'filtered out'
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warnings.warn(text)
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self.assertNotEqual(msg.message, text)
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warnings.resetwarnings()
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warnings.filterwarnings("error", "hex*", Warning, "", 0)
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self.assertRaises(UserWarning, warnings.warn, 'hex/oct')
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text = 'nonmatching text'
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warnings.warn(text)
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self.assertEqual(msg.message, text)
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self.assertEqual(msg.category, 'UserWarning')
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def test_main(verbose=None):
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test_support.run_unittest(TestModule)
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# Obscure hack so that this test passes after reloads (regrtest -R).
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if '__warningregistry__' in globals():
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del globals()['__warningregistry__']
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if __name__ == "__main__":
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test_main(verbose=True)
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