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[EDIT] FILE: test_warning.py

'''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).
'''

import unittest
from test.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__

from idlelib import run
from idlelib import PyShell as shell

# 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, exit=False)

CANCEL