/Lib/test/test_atexit.py
Python | 181 lines | 136 code | 35 blank | 10 comment | 3 complexity | c7cb05a1d20e652dbb8c0c044ed22729 MD5 | raw file
- import sys
- import unittest
- import io
- import atexit
- from test import support
- ### helpers
- def h1():
- print("h1")
- def h2():
- print("h2")
- def h3():
- print("h3")
- def h4(*args, **kwargs):
- print("h4", args, kwargs)
- def raise1():
- raise TypeError
- def raise2():
- raise SystemError
- class GeneralTest(unittest.TestCase):
- def setUp(self):
- self.save_stdout = sys.stdout
- self.save_stderr = sys.stderr
- self.stream = io.StringIO()
- sys.stdout = sys.stderr = self.stream
- atexit._clear()
- def tearDown(self):
- sys.stdout = self.save_stdout
- sys.stderr = self.save_stderr
- atexit._clear()
- def test_args(self):
- # be sure args are handled properly
- atexit.register(h1)
- atexit.register(h4)
- atexit.register(h4, 4, kw="abc")
- atexit._run_exitfuncs()
- self.assertEqual(self.stream.getvalue(),
- "h4 (4,) {'kw': 'abc'}\nh4 () {}\nh1\n")
- def test_badargs(self):
- atexit.register(lambda: 1, 0, 0, (x for x in (1,2)), 0, 0)
- self.assertRaises(TypeError, atexit._run_exitfuncs)
- def test_order(self):
- # be sure handlers are executed in reverse order
- atexit.register(h1)
- atexit.register(h2)
- atexit.register(h3)
- atexit._run_exitfuncs()
- self.assertEqual(self.stream.getvalue(), "h3\nh2\nh1\n")
- def test_raise(self):
- # be sure raises are handled properly
- atexit.register(raise1)
- atexit.register(raise2)
- self.assertRaises(TypeError, atexit._run_exitfuncs)
- def test_raise_unnormalized(self):
- # Issue #10756: Make sure that an unnormalized exception is
- # handled properly
- atexit.register(lambda: 1 / 0)
- self.assertRaises(ZeroDivisionError, atexit._run_exitfuncs)
- self.assertIn("ZeroDivisionError", self.stream.getvalue())
- def test_print_tracebacks(self):
- # Issue #18776: the tracebacks should be printed when errors occur.
- def f():
- 1/0 # one
- def g():
- 1/0 # two
- def h():
- 1/0 # three
- atexit.register(f)
- atexit.register(g)
- atexit.register(h)
- self.assertRaises(ZeroDivisionError, atexit._run_exitfuncs)
- stderr = self.stream.getvalue()
- self.assertEqual(stderr.count("ZeroDivisionError"), 3)
- self.assertIn("# one", stderr)
- self.assertIn("# two", stderr)
- self.assertIn("# three", stderr)
- def test_stress(self):
- a = [0]
- def inc():
- a[0] += 1
- for i in range(128):
- atexit.register(inc)
- atexit._run_exitfuncs()
- self.assertEqual(a[0], 128)
- def test_clear(self):
- a = [0]
- def inc():
- a[0] += 1
- atexit.register(inc)
- atexit._clear()
- atexit._run_exitfuncs()
- self.assertEqual(a[0], 0)
- def test_unregister(self):
- a = [0]
- def inc():
- a[0] += 1
- def dec():
- a[0] -= 1
- for i in range(4):
- atexit.register(inc)
- atexit.register(dec)
- atexit.unregister(inc)
- atexit._run_exitfuncs()
- self.assertEqual(a[0], -1)
- def test_bound_methods(self):
- l = []
- atexit.register(l.append, 5)
- atexit._run_exitfuncs()
- self.assertEqual(l, [5])
- atexit.unregister(l.append)
- atexit._run_exitfuncs()
- self.assertEqual(l, [5])
- class SubinterpreterTest(unittest.TestCase):
- def test_callbacks_leak(self):
- # This test shows a leak in refleak mode if atexit doesn't
- # take care to free callbacks in its per-subinterpreter module
- # state.
- n = atexit._ncallbacks()
- code = r"""if 1:
- import atexit
- def f():
- pass
- atexit.register(f)
- del atexit
- """
- ret = support.run_in_subinterp(code)
- self.assertEqual(ret, 0)
- self.assertEqual(atexit._ncallbacks(), n)
- def test_callbacks_leak_refcycle(self):
- # Similar to the above, but with a refcycle through the atexit
- # module.
- n = atexit._ncallbacks()
- code = r"""if 1:
- import atexit
- def f():
- pass
- atexit.register(f)
- atexit.__atexit = atexit
- """
- ret = support.run_in_subinterp(code)
- self.assertEqual(ret, 0)
- self.assertEqual(atexit._ncallbacks(), n)
- if __name__ == "__main__":
- unittest.main()