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| Current File : //compat/linux/proc/self/root/usr/local/lib/python2.5/test/test_sys.py |
# -*- coding: iso-8859-1 -*-
import unittest, test.test_support
import sys, cStringIO
class SysModuleTest(unittest.TestCase):
def test_original_displayhook(self):
import __builtin__
savestdout = sys.stdout
out = cStringIO.StringIO()
sys.stdout = out
dh = sys.__displayhook__
self.assertRaises(TypeError, dh)
if hasattr(__builtin__, "_"):
del __builtin__._
dh(None)
self.assertEqual(out.getvalue(), "")
self.assert_(not hasattr(__builtin__, "_"))
dh(42)
self.assertEqual(out.getvalue(), "42\n")
self.assertEqual(__builtin__._, 42)
del sys.stdout
self.assertRaises(RuntimeError, dh, 42)
sys.stdout = savestdout
def test_lost_displayhook(self):
olddisplayhook = sys.displayhook
del sys.displayhook
code = compile("42", "<string>", "single")
self.assertRaises(RuntimeError, eval, code)
sys.displayhook = olddisplayhook
def test_custom_displayhook(self):
olddisplayhook = sys.displayhook
def baddisplayhook(obj):
raise ValueError
sys.displayhook = baddisplayhook
code = compile("42", "<string>", "single")
self.assertRaises(ValueError, eval, code)
sys.displayhook = olddisplayhook
def test_original_excepthook(self):
savestderr = sys.stderr
err = cStringIO.StringIO()
sys.stderr = err
eh = sys.__excepthook__
self.assertRaises(TypeError, eh)
try:
raise ValueError(42)
except ValueError, exc:
eh(*sys.exc_info())
sys.stderr = savestderr
self.assert_(err.getvalue().endswith("ValueError: 42\n"))
# FIXME: testing the code for a lost or replaced excepthook in
# Python/pythonrun.c::PyErr_PrintEx() is tricky.
def test_exc_clear(self):
self.assertRaises(TypeError, sys.exc_clear, 42)
# Verify that exc_info is present and matches exc, then clear it, and
# check that it worked.
def clear_check(exc):
typ, value, traceback = sys.exc_info()
self.assert_(typ is not None)
self.assert_(value is exc)
self.assert_(traceback is not None)
sys.exc_clear()
typ, value, traceback = sys.exc_info()
self.assert_(typ is None)
self.assert_(value is None)
self.assert_(traceback is None)
def clear():
try:
raise ValueError, 42
except ValueError, exc:
clear_check(exc)
# Raise an exception and check that it can be cleared
clear()
# Verify that a frame currently handling an exception is
# unaffected by calling exc_clear in a nested frame.
try:
raise ValueError, 13
except ValueError, exc:
typ1, value1, traceback1 = sys.exc_info()
clear()
typ2, value2, traceback2 = sys.exc_info()
self.assert_(typ1 is typ2)
self.assert_(value1 is exc)
self.assert_(value1 is value2)
self.assert_(traceback1 is traceback2)
# Check that an exception can be cleared outside of an except block
clear_check(exc)
def test_exit(self):
self.assertRaises(TypeError, sys.exit, 42, 42)
# call without argument
try:
sys.exit(0)
except SystemExit, exc:
self.assertEquals(exc.code, 0)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with tuple argument with one entry
# entry will be unpacked
try:
sys.exit(42)
except SystemExit, exc:
self.assertEquals(exc.code, 42)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with integer argument
try:
sys.exit((42,))
except SystemExit, exc:
self.assertEquals(exc.code, 42)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with string argument
try:
sys.exit("exit")
except SystemExit, exc:
self.assertEquals(exc.code, "exit")
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with tuple argument with two entries
try:
sys.exit((17, 23))
except SystemExit, exc:
self.assertEquals(exc.code, (17, 23))
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# test that the exit machinery handles SystemExits properly
import subprocess
# both unnormalized...
rc = subprocess.call([sys.executable, "-c",
"raise SystemExit, 46"])
self.assertEqual(rc, 46)
# ... and normalized
rc = subprocess.call([sys.executable, "-c",
"raise SystemExit(47)"])
self.assertEqual(rc, 47)
def test_getdefaultencoding(self):
if test.test_support.have_unicode:
self.assertRaises(TypeError, sys.getdefaultencoding, 42)
# can't check more than the type, as the user might have changed it
self.assert_(isinstance(sys.getdefaultencoding(), str))
# testing sys.settrace() is done in test_trace.py
# testing sys.setprofile() is done in test_profile.py
def test_setcheckinterval(self):
self.assertRaises(TypeError, sys.setcheckinterval)
orig = sys.getcheckinterval()
for n in 0, 100, 120, orig: # orig last to restore starting state
sys.setcheckinterval(n)
self.assertEquals(sys.getcheckinterval(), n)
def test_recursionlimit(self):
self.assertRaises(TypeError, sys.getrecursionlimit, 42)
oldlimit = sys.getrecursionlimit()
self.assertRaises(TypeError, sys.setrecursionlimit)
self.assertRaises(ValueError, sys.setrecursionlimit, -42)
sys.setrecursionlimit(10000)
self.assertEqual(sys.getrecursionlimit(), 10000)
sys.setrecursionlimit(oldlimit)
def test_getwindowsversion(self):
if hasattr(sys, "getwindowsversion"):
v = sys.getwindowsversion()
self.assert_(isinstance(v, tuple))
self.assertEqual(len(v), 5)
self.assert_(isinstance(v[0], int))
self.assert_(isinstance(v[1], int))
self.assert_(isinstance(v[2], int))
self.assert_(isinstance(v[3], int))
self.assert_(isinstance(v[4], str))
def test_dlopenflags(self):
if hasattr(sys, "setdlopenflags"):
self.assert_(hasattr(sys, "getdlopenflags"))
self.assertRaises(TypeError, sys.getdlopenflags, 42)
oldflags = sys.getdlopenflags()
self.assertRaises(TypeError, sys.setdlopenflags)
sys.setdlopenflags(oldflags+1)
self.assertEqual(sys.getdlopenflags(), oldflags+1)
sys.setdlopenflags(oldflags)
def test_refcount(self):
self.assertRaises(TypeError, sys.getrefcount)
c = sys.getrefcount(None)
n = None
self.assertEqual(sys.getrefcount(None), c+1)
del n
self.assertEqual(sys.getrefcount(None), c)
if hasattr(sys, "gettotalrefcount"):
self.assert_(isinstance(sys.gettotalrefcount(), int))
def test_getframe(self):
self.assertRaises(TypeError, sys._getframe, 42, 42)
self.assertRaises(ValueError, sys._getframe, 2000000000)
self.assert_(
SysModuleTest.test_getframe.im_func.func_code \
is sys._getframe().f_code
)
# sys._current_frames() is a CPython-only gimmick.
def test_current_frames(self):
have_threads = True
try:
import thread
except ImportError:
have_threads = False
if have_threads:
self.current_frames_with_threads()
else:
self.current_frames_without_threads()
# Test sys._current_frames() in a WITH_THREADS build.
def current_frames_with_threads(self):
import threading, thread
import traceback
# Spawn a thread that blocks at a known place. Then the main
# thread does sys._current_frames(), and verifies that the frames
# returned make sense.
entered_g = threading.Event()
leave_g = threading.Event()
thread_info = [] # the thread's id
def f123():
g456()
def g456():
thread_info.append(thread.get_ident())
entered_g.set()
leave_g.wait()
t = threading.Thread(target=f123)
t.start()
entered_g.wait()
# At this point, t has finished its entered_g.set(), although it's
# impossible to guess whether it's still on that line or has moved on
# to its leave_g.wait().
self.assertEqual(len(thread_info), 1)
thread_id = thread_info[0]
d = sys._current_frames()
main_id = thread.get_ident()
self.assert_(main_id in d)
self.assert_(thread_id in d)
# Verify that the captured main-thread frame is _this_ frame.
frame = d.pop(main_id)
self.assert_(frame is sys._getframe())
# Verify that the captured thread frame is blocked in g456, called
# from f123. This is a litte tricky, since various bits of
# threading.py are also in the thread's call stack.
frame = d.pop(thread_id)
stack = traceback.extract_stack(frame)
for i, (filename, lineno, funcname, sourceline) in enumerate(stack):
if funcname == "f123":
break
else:
self.fail("didn't find f123() on thread's call stack")
self.assertEqual(sourceline, "g456()")
# And the next record must be for g456().
filename, lineno, funcname, sourceline = stack[i+1]
self.assertEqual(funcname, "g456")
self.assert_(sourceline in ["leave_g.wait()", "entered_g.set()"])
# Reap the spawned thread.
leave_g.set()
t.join()
# Test sys._current_frames() when thread support doesn't exist.
def current_frames_without_threads(self):
# Not much happens here: there is only one thread, with artificial
# "thread id" 0.
d = sys._current_frames()
self.assertEqual(len(d), 1)
self.assert_(0 in d)
self.assert_(d[0] is sys._getframe())
def test_attributes(self):
self.assert_(isinstance(sys.api_version, int))
self.assert_(isinstance(sys.argv, list))
self.assert_(sys.byteorder in ("little", "big"))
self.assert_(isinstance(sys.builtin_module_names, tuple))
self.assert_(isinstance(sys.copyright, basestring))
self.assert_(isinstance(sys.exec_prefix, basestring))
self.assert_(isinstance(sys.executable, basestring))
self.assert_(isinstance(sys.hexversion, int))
self.assert_(isinstance(sys.maxint, int))
if test.test_support.have_unicode:
self.assert_(isinstance(sys.maxunicode, int))
self.assert_(isinstance(sys.platform, basestring))
self.assert_(isinstance(sys.prefix, basestring))
self.assert_(isinstance(sys.version, basestring))
vi = sys.version_info
self.assert_(isinstance(vi, tuple))
self.assertEqual(len(vi), 5)
self.assert_(isinstance(vi[0], int))
self.assert_(isinstance(vi[1], int))
self.assert_(isinstance(vi[2], int))
self.assert_(vi[3] in ("alpha", "beta", "candidate", "final"))
self.assert_(isinstance(vi[4], int))
def test_43581(self):
# Can't use sys.stdout, as this is a cStringIO object when
# the test runs under regrtest.
self.assert_(sys.__stdout__.encoding == sys.__stderr__.encoding)
def test_main():
test.test_support.run_unittest(SysModuleTest)
if __name__ == "__main__":
test_main()