Lib/test/test_atexit.py

   1 import sys
   2 import unittest
   3 import StringIO
   4 import atexit
   5 from imp import reload
   6 from test import test_support
   7
   8 class TestCase(unittest.TestCase):
   9     def setUp(self):
  10         s = StringIO.StringIO()
  11         self.save_stdout = sys.stdout
  12         self.save_stderr = sys.stderr
  13         sys.stdout = sys.stderr = self.subst_io = s
  14         self.save_handlers = atexit._exithandlers
  15         atexit._exithandlers = []
  16
  17     def tearDown(self):
  18         sys.stdout = self.save_stdout
  19         sys.stderr = self.save_stderr
  20         atexit._exithandlers = self.save_handlers
  21
  22     def test_args(self):
  23         atexit.register(self.h1)
  24         atexit.register(self.h4)
  25         atexit.register(self.h4, 4, kw="abc")
  26         atexit._run_exitfuncs()
  27         self.assertEqual(self.subst_io.getvalue(),
  28                          "h4 (4,) {'kw': 'abc'}\nh4 () {}\nh1\n")
  29
  30     def test_badargs(self):
  31         atexit.register(lambda: 1, 0, 0, (x for x in (1,2)), 0, 0)
  32         self.assertRaises(TypeError, atexit._run_exitfuncs)
  33
  34     def test_order(self):
  35         atexit.register(self.h1)
  36         atexit.register(self.h2)
  37         atexit.register(self.h3)
  38         atexit._run_exitfuncs()
  39         self.assertEqual(self.subst_io.getvalue(), "h3\nh2\nh1\n")
  40
  41     def test_sys_override(self):
  42         # be sure a preset sys.exitfunc is handled properly
  43         exfunc = sys.exitfunc
  44         sys.exitfunc = self.h1
  45         reload(atexit)
  46         try:
  47             atexit.register(self.h2)
  48             atexit._run_exitfuncs()
  49         finally:
  50             sys.exitfunc = exfunc
  51         self.assertEqual(self.subst_io.getvalue(), "h2\nh1\n")
  52
  53     def test_raise(self):
  54         atexit.register(self.raise1)
  55         atexit.register(self.raise2)
  56         self.assertRaises(TypeError, atexit._run_exitfuncs)
  57
  58     ### helpers
  59     def h1(self):
  60         print "h1"
  61
  62     def h2(self):
  63         print "h2"
  64
  65     def h3(self):
  66         print "h3"
  67
  68     def h4(self, *args, **kwargs):
  69         print "h4", args, kwargs
  70
  71     def raise1(self):
  72         raise TypeError
  73
  74     def raise2(self):
  75         raise SystemError
  76
  77 def test_main():
  78     test_support.run_unittest(TestCase)
  79
  80
  81 if __name__ == "__main__":
  82     test_main()