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1'''Test warnings replacement in pyshell.py and run.py.
2
3This file could be expanded to include traceback overrides
4(in same two modules). If so, change name.
5Revise if output destination changes (http://bugs.python.org/issue18318).
6Make sure warnings module is left unaltered (http://bugs.python.org/issue18081).
7'''
8from idlelib import run
9from idlelib import pyshell as shell
10import unittest
11from test.support import captured_stderr
12import warnings
13
14# Try to capture default showwarning before Idle modules are imported.
15showwarning = warnings.showwarning
16# But if we run this file within idle, we are in the middle of the run.main loop
17# and default showwarnings has already been replaced.
18running_in_idle = 'idle' in showwarning.__name__
19
20# The following was generated from pyshell.idle_formatwarning
21# and checked as matching expectation.
22idlemsg = '''
23Warning (from warnings module):
24  File "test_warning.py", line 99
25    Line of code
26UserWarning: Test
27'''
28shellmsg = idlemsg + ">>> "
29
30
31class RunWarnTest(unittest.TestCase):
32
33    @unittest.skipIf(running_in_idle, "Does not work when run within Idle.")
34    def test_showwarnings(self):
35        self.assertIs(warnings.showwarning, showwarning)
36        run.capture_warnings(True)
37        self.assertIs(warnings.showwarning, run.idle_showwarning_subproc)
38        run.capture_warnings(False)
39        self.assertIs(warnings.showwarning, showwarning)
40
41    def test_run_show(self):
42        with captured_stderr() as f:
43            run.idle_showwarning_subproc(
44                    'Test', UserWarning, 'test_warning.py', 99, f, 'Line of code')
45            # The following uses .splitlines to erase line-ending differences
46            self.assertEqual(idlemsg.splitlines(), f.getvalue().splitlines())
47
48
49class ShellWarnTest(unittest.TestCase):
50
51    @unittest.skipIf(running_in_idle, "Does not work when run within Idle.")
52    def test_showwarnings(self):
53        self.assertIs(warnings.showwarning, showwarning)
54        shell.capture_warnings(True)
55        self.assertIs(warnings.showwarning, shell.idle_showwarning)
56        shell.capture_warnings(False)
57        self.assertIs(warnings.showwarning, showwarning)
58
59    def test_idle_formatter(self):
60        # Will fail if format changed without regenerating idlemsg
61        s = shell.idle_formatwarning(
62                'Test', UserWarning, 'test_warning.py', 99, 'Line of code')
63        self.assertEqual(idlemsg, s)
64
65    def test_shell_show(self):
66        with captured_stderr() as f:
67            shell.idle_showwarning(
68                    'Test', UserWarning, 'test_warning.py', 99, f, 'Line of code')
69            self.assertEqual(shellmsg.splitlines(), f.getvalue().splitlines())
70
71
72if __name__ == '__main__':
73    unittest.main(verbosity=2)
74