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1import sys
2import unittest
3import StringIO
4import atexit
5from imp import reload
6from test import test_support
7
8class 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
77def test_main():
78    test_support.run_unittest(TestCase)
79
80
81if __name__ == "__main__":
82    test_main()
83