def testAFakeZlib(self):
#
# This could cause a stack overflow before: importing zlib.py
# from a compressed archive would cause zlib to be imported
# which would find zlib.py in the archive, which would... etc.
#
# This test *must* be executed first: it must be the first one
# to trigger zipimport to import zlib (zipimport caches the
# zlib.decompress function object, after which the problem being
# tested here wouldn't be a problem anymore...
# (Hence the 'A' in the test method name: to make it the first
# item in a list sorted by name, like unittest.makeSuite() does.)
#
# This test fails on platforms on which the zlib module is
# statically linked, but the problem it tests for can't
# occur in that case (builtin modules are always found first),
# so we'll simply skip it then. Bug #765456.
#
if "zlib" in sys.builtin_module_names:
return
if "zlib" in sys.modules:
del sys.modules["zlib"]
files = {"zlib.py": (NOW, test_src)}
try:
self.doTest(".py", files, "zlib")
except ImportError:
if self.compression != ZIP_DEFLATED:
self.fail("expected test to not raise ImportError")
else:
if self.compression != ZIP_STORED:
self.fail("expected test to raise ImportError")
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