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'''Test warnings replacement in pyshell.py and run.py.
This file could be expanded to include traceback overrides
(in same two modules). If so, change name.
Revise if output destination changes (http://bugs.python.org/issue18318).
Make sure warnings module is left unaltered (http://bugs.python.org/issue18081).
'''
from idlelib import run
from idlelib import pyshell as shell
import unittest
from test.support import captured_stderr
import warnings
# Try to capture default showwarning before Idle modules are imported.
showwarning = warnings.showwarning
# But if we run this file within idle, we are in the middle of the run.main loop
# and default showwarnings has already been replaced.
running_in_idle = 'idle' in showwarning.__name__
# The following was generated from pyshell.idle_formatwarning
# and checked as matching expectation.
idlemsg = '''
Warning (from warnings module):
File "test_warning.py", line 99
Line of code
UserWarning: Test
'''
shellmsg = idlemsg + ">>> "
class RunWarnTest(unittest.TestCase):
@unittest.skipIf(running_in_idle, "Does not work when run within Idle.")
def test_showwarnings(self):
self.assertIs(warnings.showwarning, showwarning)
run.capture_warnings(True)
self.assertIs(warnings.showwarning, run.idle_showwarning_subproc)
run.capture_warnings(False)
self.assertIs(warnings.showwarning, showwarning)
def test_run_show(self):
with captured_stderr() as f:
run.idle_showwarning_subproc(
'Test', UserWarning, 'test_warning.py', 99, f, 'Line of code')
# The following uses .splitlines to erase line-ending differences
self.assertEqual(idlemsg.splitlines(), f.getvalue().splitlines())
class ShellWarnTest(unittest.TestCase):
@unittest.skipIf(running_in_idle, "Does not work when run within Idle.")
def test_showwarnings(self):
self.assertIs(warnings.showwarning, showwarning)
shell.capture_warnings(True)
self.assertIs(warnings.showwarning, shell.idle_showwarning)
shell.capture_warnings(False)
self.assertIs(warnings.showwarning, showwarning)
def test_idle_formatter(self):
# Will fail if format changed without regenerating idlemsg
s = shell.idle_formatwarning(
'Test', UserWarning, 'test_warning.py', 99, 'Line of code')
self.assertEqual(idlemsg, s)
def test_shell_show(self):
with captured_stderr() as f:
shell.idle_showwarning(
'Test', UserWarning, 'test_warning.py', 99, f, 'Line of code')
self.assertEqual(shellmsg.splitlines(), f.getvalue().splitlines())
if __name__ == '__main__':
unittest.main(verbosity=2)
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