mirror of
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356 lines
12 KiB
Python
356 lines
12 KiB
Python
# -*- coding: iso-8859-1 -*-
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import unittest, test.support
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import sys, io
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class SysModuleTest(unittest.TestCase):
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def setUp(self):
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self.orig_stdout = sys.stdout
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self.orig_stderr = sys.stderr
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self.orig_displayhook = sys.displayhook
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def tearDown(self):
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sys.stdout = self.orig_stdout
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sys.stderr = self.orig_stderr
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sys.displayhook = self.orig_displayhook
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def test_original_displayhook(self):
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import builtins
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out = io.StringIO()
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sys.stdout = out
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dh = sys.__displayhook__
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self.assertRaises(TypeError, dh)
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if hasattr(builtins, "_"):
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del builtins._
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dh(None)
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self.assertEqual(out.getvalue(), "")
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self.assert_(not hasattr(builtins, "_"))
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dh(42)
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self.assertEqual(out.getvalue(), "42\n")
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self.assertEqual(builtins._, 42)
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del sys.stdout
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self.assertRaises(RuntimeError, dh, 42)
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def test_lost_displayhook(self):
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del sys.displayhook
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code = compile("42", "<string>", "single")
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self.assertRaises(RuntimeError, eval, code)
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def test_custom_displayhook(self):
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def baddisplayhook(obj):
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raise ValueError
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sys.displayhook = baddisplayhook
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code = compile("42", "<string>", "single")
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self.assertRaises(ValueError, eval, code)
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def test_original_excepthook(self):
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err = io.StringIO()
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sys.stderr = err
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eh = sys.__excepthook__
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self.assertRaises(TypeError, eh)
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try:
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raise ValueError(42)
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except ValueError as exc:
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eh(*sys.exc_info())
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self.assert_(err.getvalue().endswith("ValueError: 42\n"))
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# FIXME: testing the code for a lost or replaced excepthook in
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# Python/pythonrun.c::PyErr_PrintEx() is tricky.
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def test_exit(self):
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self.assertRaises(TypeError, sys.exit, 42, 42)
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# call without argument
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try:
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sys.exit(0)
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except SystemExit as exc:
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self.assertEquals(exc.code, 0)
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except:
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self.fail("wrong exception")
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else:
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self.fail("no exception")
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# call with tuple argument with one entry
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# entry will be unpacked
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try:
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sys.exit(42)
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except SystemExit as exc:
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self.assertEquals(exc.code, 42)
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except:
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self.fail("wrong exception")
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else:
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self.fail("no exception")
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# call with integer argument
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try:
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sys.exit((42,))
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except SystemExit as exc:
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self.assertEquals(exc.code, 42)
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except:
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self.fail("wrong exception")
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else:
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self.fail("no exception")
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# call with string argument
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try:
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sys.exit("exit")
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except SystemExit as exc:
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self.assertEquals(exc.code, "exit")
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except:
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self.fail("wrong exception")
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else:
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self.fail("no exception")
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# call with tuple argument with two entries
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try:
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sys.exit((17, 23))
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except SystemExit as exc:
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self.assertEquals(exc.code, (17, 23))
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except:
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self.fail("wrong exception")
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else:
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self.fail("no exception")
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# test that the exit machinery handles SystemExits properly
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import subprocess
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rc = subprocess.call([sys.executable, "-c",
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"raise SystemExit(47)"])
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self.assertEqual(rc, 47)
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def test_getdefaultencoding(self):
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self.assertRaises(TypeError, sys.getdefaultencoding, 42)
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# can't check more than the type, as the user might have changed it
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self.assert_(isinstance(sys.getdefaultencoding(), str))
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# testing sys.settrace() is done in test_trace.py
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# testing sys.setprofile() is done in test_profile.py
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def test_setcheckinterval(self):
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self.assertRaises(TypeError, sys.setcheckinterval)
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orig = sys.getcheckinterval()
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for n in 0, 100, 120, orig: # orig last to restore starting state
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sys.setcheckinterval(n)
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self.assertEquals(sys.getcheckinterval(), n)
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def test_recursionlimit(self):
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self.assertRaises(TypeError, sys.getrecursionlimit, 42)
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oldlimit = sys.getrecursionlimit()
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self.assertRaises(TypeError, sys.setrecursionlimit)
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self.assertRaises(ValueError, sys.setrecursionlimit, -42)
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sys.setrecursionlimit(10000)
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self.assertEqual(sys.getrecursionlimit(), 10000)
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sys.setrecursionlimit(oldlimit)
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def test_getwindowsversion(self):
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if hasattr(sys, "getwindowsversion"):
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v = sys.getwindowsversion()
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self.assert_(isinstance(v, tuple))
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self.assertEqual(len(v), 5)
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self.assert_(isinstance(v[0], int))
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self.assert_(isinstance(v[1], int))
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self.assert_(isinstance(v[2], int))
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self.assert_(isinstance(v[3], int))
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self.assert_(isinstance(v[4], str))
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def test_dlopenflags(self):
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if hasattr(sys, "setdlopenflags"):
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self.assert_(hasattr(sys, "getdlopenflags"))
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self.assertRaises(TypeError, sys.getdlopenflags, 42)
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oldflags = sys.getdlopenflags()
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self.assertRaises(TypeError, sys.setdlopenflags)
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sys.setdlopenflags(oldflags+1)
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self.assertEqual(sys.getdlopenflags(), oldflags+1)
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sys.setdlopenflags(oldflags)
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def test_refcount(self):
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self.assertRaises(TypeError, sys.getrefcount)
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c = sys.getrefcount(None)
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n = None
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self.assertEqual(sys.getrefcount(None), c+1)
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del n
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self.assertEqual(sys.getrefcount(None), c)
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if hasattr(sys, "gettotalrefcount"):
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self.assert_(isinstance(sys.gettotalrefcount(), int))
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def test_getframe(self):
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self.assertRaises(TypeError, sys._getframe, 42, 42)
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self.assertRaises(ValueError, sys._getframe, 2000000000)
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self.assert_(
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SysModuleTest.test_getframe.__code__ \
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is sys._getframe().f_code
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)
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# sys._current_frames() is a CPython-only gimmick.
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def test_current_frames(self):
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have_threads = True
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try:
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import _thread
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except ImportError:
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have_threads = False
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if have_threads:
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self.current_frames_with_threads()
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else:
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self.current_frames_without_threads()
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# Test sys._current_frames() in a WITH_THREADS build.
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def current_frames_with_threads(self):
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import threading, _thread
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import traceback
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# Spawn a thread that blocks at a known place. Then the main
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# thread does sys._current_frames(), and verifies that the frames
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# returned make sense.
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entered_g = threading.Event()
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leave_g = threading.Event()
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thread_info = [] # the thread's id
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def f123():
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g456()
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def g456():
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thread_info.append(_thread.get_ident())
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entered_g.set()
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leave_g.wait()
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t = threading.Thread(target=f123)
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t.start()
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entered_g.wait()
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# At this point, t has finished its entered_g.set(), although it's
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# impossible to guess whether it's still on that line or has moved on
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# to its leave_g.wait().
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self.assertEqual(len(thread_info), 1)
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thread_id = thread_info[0]
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d = sys._current_frames()
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main_id = _thread.get_ident()
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self.assert_(main_id in d)
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self.assert_(thread_id in d)
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# Verify that the captured main-thread frame is _this_ frame.
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frame = d.pop(main_id)
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self.assert_(frame is sys._getframe())
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# Verify that the captured thread frame is blocked in g456, called
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# from f123. This is a litte tricky, since various bits of
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# threading.py are also in the thread's call stack.
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frame = d.pop(thread_id)
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stack = traceback.extract_stack(frame)
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for i, (filename, lineno, funcname, sourceline) in enumerate(stack):
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if funcname == "f123":
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break
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else:
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self.fail("didn't find f123() on thread's call stack")
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self.assertEqual(sourceline, "g456()")
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# And the next record must be for g456().
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filename, lineno, funcname, sourceline = stack[i+1]
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self.assertEqual(funcname, "g456")
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self.assert_(sourceline in ["leave_g.wait()", "entered_g.set()"])
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# Reap the spawned thread.
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leave_g.set()
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t.join()
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# Test sys._current_frames() when thread support doesn't exist.
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def current_frames_without_threads(self):
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# Not much happens here: there is only one thread, with artificial
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# "thread id" 0.
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d = sys._current_frames()
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self.assertEqual(len(d), 1)
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self.assert_(0 in d)
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self.assert_(d[0] is sys._getframe())
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def test_attributes(self):
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self.assert_(isinstance(sys.api_version, int))
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self.assert_(isinstance(sys.argv, list))
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self.assert_(sys.byteorder in ("little", "big"))
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self.assert_(isinstance(sys.builtin_module_names, tuple))
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self.assert_(isinstance(sys.copyright, str))
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self.assert_(isinstance(sys.exec_prefix, str))
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self.assert_(isinstance(sys.executable, str))
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self.assertEqual(len(sys.float_info), 11)
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self.assertEqual(sys.float_info.radix, 2)
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self.assert_(isinstance(sys.hexversion, int))
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self.assert_(isinstance(sys.maxsize, int))
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self.assert_(isinstance(sys.maxunicode, int))
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self.assert_(isinstance(sys.platform, str))
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self.assert_(isinstance(sys.prefix, str))
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self.assert_(isinstance(sys.version, str))
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vi = sys.version_info
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self.assert_(isinstance(vi, tuple))
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self.assertEqual(len(vi), 5)
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self.assert_(isinstance(vi[0], int))
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self.assert_(isinstance(vi[1], int))
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self.assert_(isinstance(vi[2], int))
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self.assert_(vi[3] in ("alpha", "beta", "candidate", "final"))
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self.assert_(isinstance(vi[4], int))
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def test_43581(self):
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# Can't use sys.stdout, as this is a cStringIO object when
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# the test runs under regrtest.
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self.assertEqual(sys.__stdout__.encoding, sys.__stderr__.encoding)
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def test_intern(self):
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self.assertRaises(TypeError, sys.intern)
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s = "never interned before"
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self.assert_(sys.intern(s) is s)
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s2 = s.swapcase().swapcase()
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self.assert_(sys.intern(s2) is s)
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# Subclasses of string can't be interned, because they
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# provide too much opportunity for insane things to happen.
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# We don't want them in the interned dict and if they aren't
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# actually interned, we don't want to create the appearance
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# that they are by allowing intern() to succeeed.
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class S(str):
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def __hash__(self):
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return 123
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self.assertRaises(TypeError, sys.intern, S("abc"))
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def test_sys_flags(self):
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self.failUnless(sys.flags)
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attrs = ("debug", "division_warning",
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"inspect", "interactive", "optimize", "dont_write_bytecode",
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"no_site", "ignore_environment", "tabcheck", "verbose",
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"bytes_warning")
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for attr in attrs:
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self.assert_(hasattr(sys.flags, attr), attr)
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self.assertEqual(type(getattr(sys.flags, attr)), int, attr)
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self.assert_(repr(sys.flags))
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def test_clear_type_cache(self):
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sys._clear_type_cache()
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def test_compact_freelists(self):
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sys._compact_freelists()
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r = sys._compact_freelists()
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## freed blocks shouldn't change
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#self.assertEqual(r[0][2], 0)
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## fill freelists
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#ints = list(range(10000))
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#floats = [float(i) for i in ints]
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#del ints
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#del floats
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## should free more than 100 blocks
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#r = sys._compact_freelists()
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#self.assert_(r[0][1] > 100, r[0][1])
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#self.assert_(r[0][2] > 100, r[0][2])
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def test_main():
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test.support.run_unittest(SysModuleTest)
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if __name__ == "__main__":
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test_main()
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