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import warnings
import linecache
import os
from io import StringIO
import sys
import unittest
from test import test_support
from test import warning_tests
class TestModule(unittest.TestCase):
def setUp(self):
self.ignored = [w[2].__name__ for w in warnings.filters
if w[0]=='ignore' and w[1] is None and w[3] is None]
def test_warn_default_category(self):
with test_support.catch_warning() as w:
for i in range(4):
text = 'multi %d' %i # Different text on each call
warnings.warn(text)
self.assertEqual(str(w.message), text)
self.assert_(w.category is UserWarning)
def test_warn_specific_category(self):
with test_support.catch_warning() as w:
text = 'None'
for category in [DeprecationWarning, FutureWarning,
PendingDeprecationWarning, RuntimeWarning,
SyntaxWarning, UserWarning, Warning]:
if category.__name__ in self.ignored:
text = 'filtered out' + category.__name__
warnings.warn(text, category)
self.assertNotEqual(w.message, text)
else:
text = 'unfiltered %s' % category.__name__
warnings.warn(text, category)
self.assertEqual(str(w.message), text)
self.assert_(w.category is category)
def test_filtering(self):
# Test filterwarnings().
# Implicitly also tests resetwarnings().
with test_support.catch_warning() as w:
warnings.filterwarnings("error", "", Warning, "", 0)
self.assertRaises(UserWarning, warnings.warn, 'convert to error')
warnings.resetwarnings()
text = 'handle normally'
warnings.warn(text)
self.assertEqual(str(w.message), text)
self.assert_(w.category is UserWarning)
warnings.filterwarnings("ignore", "", Warning, "", 0)
text = 'filtered out'
warnings.warn(text)
self.assertNotEqual(str(w.message), text)
warnings.resetwarnings()
warnings.filterwarnings("error", "hex*", Warning, "", 0)
self.assertRaises(UserWarning, warnings.warn, 'hex/oct')
text = 'nonmatching text'
warnings.warn(text)
self.assertEqual(str(w.message), text)
self.assert_(w.category is UserWarning)
def test_options(self):
# Uses the private _setoption() function to test the parsing
# of command-line warning arguments
with test_support.catch_warning():
self.assertRaises(warnings._OptionError,
warnings._setoption, '1:2:3:4:5:6')
self.assertRaises(warnings._OptionError,
warnings._setoption, 'bogus::Warning')
self.assertRaises(warnings._OptionError,
warnings._setoption, 'ignore:2::4:-5')
warnings._setoption('error::Warning::0')
self.assertRaises(UserWarning, warnings.warn, 'convert to error')
def test_filename(self):
with test_support.catch_warning() as w:
warning_tests.inner("spam1")
self.assertEqual(os.path.basename(w.filename), "warning_tests.py")
warning_tests.outer("spam2")
self.assertEqual(os.path.basename(w.filename), "warning_tests.py")
def test_stacklevel(self):
# Test stacklevel argument
# make sure all messages are different, so the warning won't be skipped
with test_support.catch_warning() as w:
warning_tests.inner("spam3", stacklevel=1)
self.assertEqual(os.path.basename(w.filename), "warning_tests.py")
warning_tests.outer("spam4", stacklevel=1)
self.assertEqual(os.path.basename(w.filename), "warning_tests.py")
warning_tests.inner("spam5", stacklevel=2)
self.assertEqual(os.path.basename(w.filename), "test_warnings.py")
warning_tests.outer("spam6", stacklevel=2)
self.assertEqual(os.path.basename(w.filename), "warning_tests.py")
warning_tests.inner("spam7", stacklevel=9999)
self.assertEqual(os.path.basename(w.filename), "sys")
class WarningsDisplayTests(unittest.TestCase):
def test_formatwarning(self):
message = "msg"
category = Warning
file_name = os.path.splitext(warning_tests.__file__)[0] + '.py'
line_num = 3
file_line = linecache.getline(file_name, line_num).strip()
expect = "%s:%s: %s: %s\n %s\n" % (file_name, line_num, category.__name__,
message, file_line)
self.failUnlessEqual(warnings.formatwarning(message, category,
file_name, line_num),
expect)
def test_showwarning(self):
file_name = os.path.splitext(warning_tests.__file__)[0] + '.py'
line_num = 3
expected_file_line = linecache.getline(file_name, line_num).strip()
message = 'msg'
category = Warning
file_object = StringIO()
expect = warnings.formatwarning(message, category, file_name, line_num)
warnings.showwarning(message, category, file_name, line_num,
file_object)
self.failUnlessEqual(file_object.getvalue(), expect)
def test_main(verbose=None):
# Obscure hack so that this test passes after reloads or repeated calls
# to test_main (regrtest -R).
if '__warningregistry__' in globals():
del globals()['__warningregistry__']
if hasattr(warning_tests, '__warningregistry__'):
del warning_tests.__warningregistry__
if hasattr(sys, '__warningregistry__'):
del sys.__warningregistry__
test_support.run_unittest(TestModule, WarningsDisplayTests)
if __name__ == "__main__":
test_main(verbose=True)
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