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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). ''' 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)