Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / devtools / v9 / lib / python2.4 / test / test_import.py

from test.test_support import TESTFN, TestFailed

import os
import random
import sys
import py_compile

# Brief digression to test that import is case-sensitive:  if we got this
# far, we know for sure that "random" exists.
try:
   import RAnDoM
except ImportError:
   pass
else:
   raise TestFailed("import of RAnDoM should have failed (case mismatch)")

# Another brief digression to test the accuracy of manifest float constants.
import double_const  # don't blink -- that *was* the test

def remove_files(name):
   for f in (name + os.extsep + "py",
             name + os.extsep + "pyc",
             name + os.extsep + "pyo",
             name + os.extsep + "pyw",
             name + "$py.class"):
       if os.path.exists(f):
           os.remove(f)

def test_with_extension(ext): # ext normally ".py"; perhaps ".pyw"
   source = TESTFN + ext
   pyo = TESTFN + os.extsep + "pyo"
   if sys.platform.startswith('java'):
       pyc = TESTFN + "$py.class"
   else:
       pyc = TESTFN + os.extsep + "pyc"

   f = open(source, "w")
   print >> f, "# This tests Python's ability to import a", ext, "file."
   a = random.randrange(1000)
   b = random.randrange(1000)
   print >> f, "a =", a
   print >> f, "b =", b
   f.close()

   try:
       try:
           mod = __import__(TESTFN)
       except ImportError, err:
           raise ValueError("import from %s failed: %s" % (ext, err))

       if mod.a != a or mod.b != b:
           print a, "!=", mod.a
           print b, "!=", mod.b
           raise ValueError("module loaded (%s) but contents invalid" % mod)
   finally:
       os.unlink(source)

   try:
       try:
           reload(mod)
       except ImportError, err:
           raise ValueError("import from .pyc/.pyo failed: %s" % err)
   finally:
       try:
           os.unlink(pyc)
       except os.error:
           pass
       try:
           os.unlink(pyo)
       except os.error:
           pass
       del sys.modules[TESTFN]

sys.path.insert(0, os.curdir)
try:
   test_with_extension(os.extsep + "py")
   if sys.platform.startswith("win"):
       for ext in ".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw":
           test_with_extension(ext)
finally:
   del sys.path[0]

# Verify that the imp module can correctly load and find .py files
import imp
x = imp.find_module("os")
os = imp.load_module("os", *x)

def test_module_with_large_stack(module):
   # create module w/list of 65000 elements to test bug #561858
   filename = module + os.extsep + 'py'

   # create a file with a list of 65000 elements
   f = open(filename, 'w+')
   f.write('d = [\n')
   for i in range(65000):
       f.write('"",\n')
   f.write(']')
   f.close()

   # compile & remove .py file, we only need .pyc (or .pyo)
   f = open(filename, 'r')
   py_compile.compile(filename)
   f.close()
   os.unlink(filename)

   # need to be able to load from current dir
   sys.path.append('')

   # this used to crash
   exec 'import ' + module

   # cleanup
   del sys.path[-1]
   for ext in 'pyc', 'pyo':
       fname = module + os.extsep + ext
       if os.path.exists(fname):
           os.unlink(fname)

test_module_with_large_stack('longlist')

def test_failing_import_sticks():
   source = TESTFN + os.extsep + "py"
   f = open(source, "w")
   print >> f, "a = 1/0"
   f.close()

   # New in 2.4, we shouldn't be able to import that no matter how often
   # we try.
   sys.path.insert(0, os.curdir)
   try:
       for i in 1, 2, 3:
           try:
               mod = __import__(TESTFN)
           except ZeroDivisionError:
               if TESTFN in sys.modules:
                   raise TestFailed("damaged module in sys.modules", i)
           else:
               raise TestFailed("was able to import a damaged module", i)
   finally:
       sys.path.pop(0)
       remove_files(TESTFN)

test_failing_import_sticks()

def test_failing_reload():
   # A failing reload should leave the module object in sys.modules.
   source = TESTFN + os.extsep + "py"
   f = open(source, "w")
   print >> f, "a = 1"
   print >> f, "b = 2"
   f.close()

   sys.path.insert(0, os.curdir)
   try:
       mod = __import__(TESTFN)
       if TESTFN not in sys.modules:
           raise TestFailed("expected module in sys.modules")
       if mod.a != 1 or mod.b != 2:
           raise TestFailed("module has wrong attribute values")

       # On WinXP, just replacing the .py file wasn't enough to
       # convince reload() to reparse it.  Maybe the timestamp didn't
       # move enough.  We force it to get reparsed by removing the
       # compiled file too.
       remove_files(TESTFN)

       # Now damage the module.
       f = open(source, "w")
       print >> f, "a = 10"
       print >> f, "b = 20//0"
       f.close()
       try:
           reload(mod)
       except ZeroDivisionError:
           pass
       else:
           raise TestFailed("was able to reload a damaged module")

       # But we still expect the module to be in sys.modules.
       mod = sys.modules.get(TESTFN)
       if mod is None:
           raise TestFailed("expected module to still be in sys.modules")
       # We should have replaced a w/ 10, but the old b value should
       # stick.
       if mod.a != 10 or mod.b != 2:
           raise TestFailed("module has wrong attribute values")

   finally:
       sys.path.pop(0)
       remove_files(TESTFN)
       if TESTFN in sys.modules:
           del sys.modules[TESTFN]

test_failing_reload()