cpython/Lib/test/test_zipimport.py

import sys
import os
import marshal
import importlib
import importlib.util
import struct
import time
import unittest
import unittest.mock
import warnings

from test import support
from test.support import import_helper
from test.support import os_helper

from zipfile import ZipFile, ZipInfo, ZIP_STORED, ZIP_DEFLATED

import zipimport
import linecache
import doctest
import inspect
import io
from traceback import extract_tb, extract_stack, print_tb
try:
    import zlib
except ImportError:
    zlib = None

test_src = """\
def get_name():
    return __name__
def get_file():
    return __file__
"""
test_co = compile(test_src, "<???>", "exec")
raise_src = 'def do_raise(): raise TypeError\n'

def make_pyc(co, mtime, size):
    data = marshal.dumps(co)
    pyc = (importlib.util.MAGIC_NUMBER +
        struct.pack("<iLL", 0,
                    int(mtime) & 0xFFFF_FFFF, size & 0xFFFF_FFFF) + data)
    return pyc

def module_path_to_dotted_name(path):
    return path.replace(os.sep, '.')

NOW = time.time()
test_pyc = make_pyc(test_co, NOW, len(test_src))


TESTMOD = "ziptestmodule"
TESTPACK = "ziptestpackage"
TESTPACK2 = "ziptestpackage2"
TEMP_DIR = os.path.abspath("junk95142")
TEMP_ZIP = os.path.abspath("junk95142.zip")

pyc_file = importlib.util.cache_from_source(TESTMOD + '.py')
pyc_ext = '.pyc'


class ImportHooksBaseTestCase(unittest.TestCase):

    def setUp(self):
        self.path = sys.path[:]
        self.meta_path = sys.meta_path[:]
        self.path_hooks = sys.path_hooks[:]
        sys.path_importer_cache.clear()
        self.modules_before = import_helper.modules_setup()

    def tearDown(self):
        sys.path[:] = self.path
        sys.meta_path[:] = self.meta_path
        sys.path_hooks[:] = self.path_hooks
        sys.path_importer_cache.clear()
        import_helper.modules_cleanup(*self.modules_before)


class UncompressedZipImportTestCase(ImportHooksBaseTestCase):

    compression = ZIP_STORED

    def setUp(self):
        # We're reusing the zip archive path, so we must clear the
        # cached directory info and linecache.
        linecache.clearcache()
        zipimport._zip_directory_cache.clear()
        ImportHooksBaseTestCase.setUp(self)

    def makeTree(self, files, dirName=TEMP_DIR):
        # Create a filesystem based set of modules/packages
        # defined by files under the directory dirName.
        self.addCleanup(os_helper.rmtree, dirName)

        for name, (mtime, data) in files.items():
            path = os.path.join(dirName, name)
            if path[-1] == os.sep:
                if not os.path.isdir(path):
                    os.makedirs(path)
            else:
                dname = os.path.dirname(path)
                if not os.path.isdir(dname):
                    os.makedirs(dname)
                with open(path, 'wb') as fp:
                    fp.write(data)

    def makeZip(self, files, zipName=TEMP_ZIP, **kw):
        # Create a zip archive based set of modules/packages
        # defined by files in the zip file zipName.  If the
        # key 'stuff' exists in kw it is prepended to the archive.
        self.addCleanup(os_helper.unlink, zipName)

        with ZipFile(zipName, "w") as z:
            for name, (mtime, data) in files.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                z.writestr(zinfo, data)
            comment = kw.get("comment", None)
            if comment is not None:
                z.comment = comment

        stuff = kw.get("stuff", None)
        if stuff is not None:
            # Prepend 'stuff' to the start of the zipfile
            with open(zipName, "rb") as f:
                data = f.read()
            with open(zipName, "wb") as f:
                f.write(stuff)
                f.write(data)

    def doTest(self, expected_ext, files, *modules, **kw):
        self.makeZip(files, **kw)

        sys.path.insert(0, TEMP_ZIP)

        mod = importlib.import_module(".".join(modules))

        call = kw.get('call')
        if call is not None:
            call(mod)

        if expected_ext:
            file = mod.get_file()
            self.assertEqual(file, os.path.join(TEMP_ZIP,
                                 *modules) + expected_ext)

    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.TestLoader.getTestCaseNames() 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:
            self.skipTest('zlib is a builtin module')
        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")

    def testPy(self):
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD)

    def testPyc(self):
        files = {TESTMOD + pyc_ext: (NOW, test_pyc)}
        self.doTest(pyc_ext, files, TESTMOD)

    def testBoth(self):
        files = {TESTMOD + ".py": (NOW, test_src),
                 TESTMOD + pyc_ext: (NOW, test_pyc)}
        self.doTest(pyc_ext, files, TESTMOD)

    def testUncheckedHashBasedPyc(self):
        source = b"state = 'old'"
        source_hash = importlib.util.source_hash(source)
        bytecode = importlib._bootstrap_external._code_to_hash_pyc(
            compile(source, "???", "exec"),
            source_hash,
            False, # unchecked
        )
        files = {TESTMOD + ".py": (NOW, "state = 'new'"),
                 TESTMOD + ".pyc": (NOW - 20, bytecode)}
        def check(mod):
            self.assertEqual(mod.state, 'old')
        self.doTest(None, files, TESTMOD, call=check)

    @unittest.mock.patch('_imp.check_hash_based_pycs', 'always')
    def test_checked_hash_based_change_pyc(self):
        source = b"state = 'old'"
        source_hash = importlib.util.source_hash(source)
        bytecode = importlib._bootstrap_external._code_to_hash_pyc(
            compile(source, "???", "exec"),
            source_hash,
            False,
        )
        files = {TESTMOD + ".py": (NOW, "state = 'new'"),
                 TESTMOD + ".pyc": (NOW - 20, bytecode)}
        def check(mod):
            self.assertEqual(mod.state, 'new')
        self.doTest(None, files, TESTMOD, call=check)

    def testEmptyPy(self):
        files = {TESTMOD + ".py": (NOW, "")}
        self.doTest(None, files, TESTMOD)

    def testBadMagic(self):
        # make pyc magic word invalid, forcing loading from .py
        badmagic_pyc = bytearray(test_pyc)
        badmagic_pyc[0] ^= 0x04  # flip an arbitrary bit
        files = {TESTMOD + ".py": (NOW, test_src),
                 TESTMOD + pyc_ext: (NOW, badmagic_pyc)}
        self.doTest(".py", files, TESTMOD)

    def testBadMagic2(self):
        # make pyc magic word invalid, causing an ImportError
        badmagic_pyc = bytearray(test_pyc)
        badmagic_pyc[0] ^= 0x04  # flip an arbitrary bit
        files = {TESTMOD + pyc_ext: (NOW, badmagic_pyc)}
        try:
            self.doTest(".py", files, TESTMOD)
            self.fail("This should not be reached")
        except zipimport.ZipImportError as exc:
            self.assertIsInstance(exc.__cause__, ImportError)
            self.assertIn("magic number", exc.__cause__.msg)

    def testBadMTime(self):
        badtime_pyc = bytearray(test_pyc)
        # flip the second bit -- not the first as that one isn't stored in the
        # .py's mtime in the zip archive.
        badtime_pyc[11] ^= 0x02
        files = {TESTMOD + ".py": (NOW, test_src),
                 TESTMOD + pyc_ext: (NOW, badtime_pyc)}
        self.doTest(".py", files, TESTMOD)

    def test2038MTime(self):
        # Make sure we can handle mtimes larger than what a 32-bit signed number
        # can hold.
        twenty_thirty_eight_pyc = make_pyc(test_co, 2**32 - 1, len(test_src))
        files = {TESTMOD + ".py": (NOW, test_src),
                 TESTMOD + pyc_ext: (NOW, twenty_thirty_eight_pyc)}
        self.doTest(".py", files, TESTMOD)

    def testPackage(self):
        packdir = TESTPACK + os.sep
        files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir + TESTMOD + pyc_ext: (NOW, test_pyc)}
        self.doTest(pyc_ext, files, TESTPACK, TESTMOD)

    def testSubPackage(self):
        # Test that subpackages function when loaded from zip
        # archives.
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}
        self.doTest(pyc_ext, files, TESTPACK, TESTPACK2, TESTMOD)

    def testSubNamespacePackage(self):
        # Test that implicit namespace subpackages function
        # when loaded from zip archives.
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        # The first two files are just directory entries (so have no data).
        files = {packdir: (NOW, ""),
                 packdir2: (NOW, ""),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}
        self.doTest(pyc_ext, files, TESTPACK, TESTPACK2, TESTMOD)

    def testMixedNamespacePackage(self):
        # Test implicit namespace packages spread between a
        # real filesystem and a zip archive.
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        packdir3 = packdir2 + TESTPACK + '3' + os.sep
        files1 = {packdir: (NOW, ""),
                  packdir + TESTMOD + pyc_ext: (NOW, test_pyc),
                  packdir2: (NOW, ""),
                  packdir3: (NOW, ""),
                  packdir3 + TESTMOD + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + '3' + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}
        files2 = {packdir: (NOW, ""),
                  packdir + TESTMOD + '2' + pyc_ext: (NOW, test_pyc),
                  packdir2: (NOW, ""),
                  packdir2 + TESTMOD + '2' + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}

        zip1 = os.path.abspath("path1.zip")
        self.makeZip(files1, zip1)

        zip2 = TEMP_DIR
        self.makeTree(files2, zip2)

        # zip2 should override zip1.
        sys.path.insert(0, zip1)
        sys.path.insert(0, zip2)

        mod = importlib.import_module(TESTPACK)

        # if TESTPACK is functioning as a namespace pkg then
        # there should be two entries in the __path__.
        # First should be path2 and second path1.
        self.assertEqual(2, len(mod.__path__))
        p1, p2 = mod.__path__
        self.assertEqual(os.path.basename(TEMP_DIR), p1.split(os.sep)[-2])
        self.assertEqual("path1.zip", p2.split(os.sep)[-2])

        # packdir3 should import as a namespace package.
        # Its __path__ is an iterable of 1 element from zip1.
        mod = importlib.import_module(packdir3.replace(os.sep, '.')[:-1])
        self.assertEqual(1, len(mod.__path__))
        mpath = list(mod.__path__)[0].split('path1.zip' + os.sep)[1]
        self.assertEqual(packdir3[:-1], mpath)

        # TESTPACK/TESTMOD only exists in path1.
        mod = importlib.import_module('.'.join((TESTPACK, TESTMOD)))
        self.assertEqual("path1.zip", mod.__file__.split(os.sep)[-3])

        # And TESTPACK/(TESTMOD + '2') only exists in path2.
        mod = importlib.import_module('.'.join((TESTPACK, TESTMOD + '2')))
        self.assertEqual(os.path.basename(TEMP_DIR),
                         mod.__file__.split(os.sep)[-3])

        # One level deeper...
        subpkg = '.'.join((TESTPACK, TESTPACK2))
        mod = importlib.import_module(subpkg)
        self.assertEqual(2, len(mod.__path__))
        p1, p2 = mod.__path__
        self.assertEqual(os.path.basename(TEMP_DIR), p1.split(os.sep)[-3])
        self.assertEqual("path1.zip", p2.split(os.sep)[-3])

        # subpkg.TESTMOD exists in both zips should load from zip2.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD)))
        self.assertEqual(os.path.basename(TEMP_DIR),
                         mod.__file__.split(os.sep)[-4])

        # subpkg.TESTMOD + '2' only exists in zip2.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD + '2')))
        self.assertEqual(os.path.basename(TEMP_DIR),
                         mod.__file__.split(os.sep)[-4])

        # Finally subpkg.TESTMOD + '3' only exists in zip1.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD + '3')))
        self.assertEqual('path1.zip', mod.__file__.split(os.sep)[-4])

    def testNamespacePackage(self):
        # Test implicit namespace packages spread between multiple zip
        # archives.
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        packdir3 = packdir2 + TESTPACK + '3' + os.sep
        files1 = {packdir: (NOW, ""),
                  packdir + TESTMOD + pyc_ext: (NOW, test_pyc),
                  packdir2: (NOW, ""),
                  packdir3: (NOW, ""),
                  packdir3 + TESTMOD + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + '3' + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}
        zip1 = os.path.abspath("path1.zip")
        self.makeZip(files1, zip1)

        files2 = {packdir: (NOW, ""),
                  packdir + TESTMOD + '2' + pyc_ext: (NOW, test_pyc),
                  packdir2: (NOW, ""),
                  packdir2 + TESTMOD + '2' + pyc_ext: (NOW, test_pyc),
                  packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}
        zip2 = os.path.abspath("path2.zip")
        self.makeZip(files2, zip2)

        # zip2 should override zip1.
        sys.path.insert(0, zip1)
        sys.path.insert(0, zip2)

        mod = importlib.import_module(TESTPACK)

        # if TESTPACK is functioning as a namespace pkg then
        # there should be two entries in the __path__.
        # First should be path2 and second path1.
        self.assertEqual(2, len(mod.__path__))
        p1, p2 = mod.__path__
        self.assertEqual("path2.zip", p1.split(os.sep)[-2])
        self.assertEqual("path1.zip", p2.split(os.sep)[-2])

        # packdir3 should import as a namespace package.
        # Tts __path__ is an iterable of 1 element from zip1.
        mod = importlib.import_module(packdir3.replace(os.sep, '.')[:-1])
        self.assertEqual(1, len(mod.__path__))
        mpath = list(mod.__path__)[0].split('path1.zip' + os.sep)[1]
        self.assertEqual(packdir3[:-1], mpath)

        # TESTPACK/TESTMOD only exists in path1.
        mod = importlib.import_module('.'.join((TESTPACK, TESTMOD)))
        self.assertEqual("path1.zip", mod.__file__.split(os.sep)[-3])

        # And TESTPACK/(TESTMOD + '2') only exists in path2.
        mod = importlib.import_module('.'.join((TESTPACK, TESTMOD + '2')))
        self.assertEqual("path2.zip", mod.__file__.split(os.sep)[-3])

        # One level deeper...
        subpkg = '.'.join((TESTPACK, TESTPACK2))
        mod = importlib.import_module(subpkg)
        self.assertEqual(2, len(mod.__path__))
        p1, p2 = mod.__path__
        self.assertEqual("path2.zip", p1.split(os.sep)[-3])
        self.assertEqual("path1.zip", p2.split(os.sep)[-3])

        # subpkg.TESTMOD exists in both zips should load from zip2.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD)))
        self.assertEqual('path2.zip', mod.__file__.split(os.sep)[-4])

        # subpkg.TESTMOD + '2' only exists in zip2.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD + '2')))
        self.assertEqual('path2.zip', mod.__file__.split(os.sep)[-4])

        # Finally subpkg.TESTMOD + '3' only exists in zip1.
        mod = importlib.import_module('.'.join((subpkg, TESTMOD + '3')))
        self.assertEqual('path1.zip', mod.__file__.split(os.sep)[-4])

    def testZipImporterMethods(self):
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc),
                 "spam" + pyc_ext: (NOW, test_pyc)}

        self.addCleanup(os_helper.unlink, TEMP_ZIP)
        with ZipFile(TEMP_ZIP, "w") as z:
            for name, (mtime, data) in files.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"spam"
                z.writestr(zinfo, data)

        zi = zipimport.zipimporter(TEMP_ZIP)
        self.assertEqual(zi.archive, TEMP_ZIP)
        self.assertTrue(zi.is_package(TESTPACK))

        # PEP 302
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", DeprecationWarning)

            mod = zi.load_module(TESTPACK)
            self.assertEqual(zi.get_filename(TESTPACK), mod.__file__)

        # PEP 451
        spec = zi.find_spec('spam')
        self.assertIsNotNone(spec)
        self.assertIsInstance(spec.loader, zipimport.zipimporter)
        self.assertFalse(spec.loader.is_package('spam'))
        exec_mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(exec_mod)
        self.assertEqual(spec.loader.get_filename('spam'), exec_mod.__file__)

        spec = zi.find_spec(TESTPACK)
        mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(mod)
        self.assertEqual(zi.get_filename(TESTPACK), mod.__file__)

        existing_pack_path = importlib.import_module(TESTPACK).__path__[0]
        expected_path_path = os.path.join(TEMP_ZIP, TESTPACK)
        self.assertEqual(existing_pack_path, expected_path_path)

        self.assertFalse(zi.is_package(packdir + '__init__'))
        self.assertTrue(zi.is_package(packdir + TESTPACK2))
        self.assertFalse(zi.is_package(packdir2 + TESTMOD))

        mod_path = packdir2 + TESTMOD
        mod_name = module_path_to_dotted_name(mod_path)
        mod = importlib.import_module(mod_name)
        self.assertTrue(mod_name in sys.modules)
        self.assertIsNone(zi.get_source(TESTPACK))
        self.assertIsNone(zi.get_source(mod_path))
        self.assertEqual(zi.get_filename(mod_path), mod.__file__)
        # To pass in the module name instead of the path, we must use the
        # right importer
        loader = mod.__spec__.loader
        self.assertIsNone(loader.get_source(mod_name))
        self.assertEqual(loader.get_filename(mod_name), mod.__file__)

        # test prefix and archivepath members
        zi2 = zipimport.zipimporter(TEMP_ZIP + os.sep + TESTPACK)
        self.assertEqual(zi2.archive, TEMP_ZIP)
        self.assertEqual(zi2.prefix, TESTPACK + os.sep)

    def testInvalidateCaches(self):
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc),
                 "spam" + pyc_ext: (NOW, test_pyc)}
        self.addCleanup(os_helper.unlink, TEMP_ZIP)
        with ZipFile(TEMP_ZIP, "w") as z:
            for name, (mtime, data) in files.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"spam"
                z.writestr(zinfo, data)

        zi = zipimport.zipimporter(TEMP_ZIP)
        self.assertEqual(zi._get_files().keys(), files.keys())
        # Check that the file information remains accurate after reloading
        zi.invalidate_caches()
        self.assertEqual(zi._get_files().keys(), files.keys())
        # Add a new file to the ZIP archive
        newfile = {"spam2" + pyc_ext: (NOW, test_pyc)}
        files.update(newfile)
        with ZipFile(TEMP_ZIP, "a") as z:
            for name, (mtime, data) in newfile.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"spam"
                z.writestr(zinfo, data)
        # Check that we can detect the new file after invalidating the cache
        zi.invalidate_caches()
        self.assertEqual(zi._get_files().keys(), files.keys())
        spec = zi.find_spec('spam2')
        self.assertIsNotNone(spec)
        self.assertIsInstance(spec.loader, zipimport.zipimporter)
        # Check that the cached data is removed if the file is deleted
        os.remove(TEMP_ZIP)
        zi.invalidate_caches()
        self.assertFalse(zi._get_files())
        self.assertIsNone(zipimport._zip_directory_cache.get(zi.archive))
        self.assertIsNone(zi.find_spec("name_does_not_matter"))

    def testInvalidateCachesWithMultipleZipimports(self):
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        files = {packdir + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc),
                 "spam" + pyc_ext: (NOW, test_pyc)}
        self.addCleanup(os_helper.unlink, TEMP_ZIP)
        with ZipFile(TEMP_ZIP, "w") as z:
            for name, (mtime, data) in files.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"spam"
                z.writestr(zinfo, data)

        zi = zipimport.zipimporter(TEMP_ZIP)
        self.assertEqual(zi._get_files().keys(), files.keys())
        # Zipimporter for the same path.
        zi2 = zipimport.zipimporter(TEMP_ZIP)
        self.assertEqual(zi2._get_files().keys(), files.keys())
        # Add a new file to the ZIP archive to make the cache wrong.
        newfile = {"spam2" + pyc_ext: (NOW, test_pyc)}
        files.update(newfile)
        with ZipFile(TEMP_ZIP, "a") as z:
            for name, (mtime, data) in newfile.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"spam"
                z.writestr(zinfo, data)
        # Invalidate the cache of the first zipimporter.
        zi.invalidate_caches()
        # Check that the second zipimporter detects the new file and isn't using a stale cache.
        self.assertEqual(zi2._get_files().keys(), files.keys())
        spec = zi2.find_spec('spam2')
        self.assertIsNotNone(spec)
        self.assertIsInstance(spec.loader, zipimport.zipimporter)

    def testZipImporterMethodsInSubDirectory(self):
        packdir = TESTPACK + os.sep
        packdir2 = packdir + TESTPACK2 + os.sep
        files = {packdir2 + "__init__" + pyc_ext: (NOW, test_pyc),
                 packdir2 + TESTMOD + pyc_ext: (NOW, test_pyc)}

        self.addCleanup(os_helper.unlink, TEMP_ZIP)
        with ZipFile(TEMP_ZIP, "w") as z:
            for name, (mtime, data) in files.items():
                zinfo = ZipInfo(name, time.localtime(mtime))
                zinfo.compress_type = self.compression
                zinfo.comment = b"eggs"
                z.writestr(zinfo, data)

        zi = zipimport.zipimporter(TEMP_ZIP + os.sep + packdir)
        self.assertEqual(zi.archive, TEMP_ZIP)
        self.assertEqual(zi.prefix, packdir)
        self.assertTrue(zi.is_package(TESTPACK2))
        # PEP 302
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", DeprecationWarning)
            mod = zi.load_module(TESTPACK2)
            self.assertEqual(zi.get_filename(TESTPACK2), mod.__file__)
        # PEP 451
        spec = zi.find_spec(TESTPACK2)
        mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(mod)
        self.assertEqual(spec.loader.get_filename(TESTPACK2), mod.__file__)

        self.assertFalse(zi.is_package(TESTPACK2 + os.sep + '__init__'))
        self.assertFalse(zi.is_package(TESTPACK2 + os.sep + TESTMOD))

        pkg_path = TEMP_ZIP + os.sep + packdir + TESTPACK2
        zi2 = zipimport.zipimporter(pkg_path)

        # PEP 451
        spec = zi2.find_spec(TESTMOD)
        self.assertIsNotNone(spec)
        self.assertIsInstance(spec.loader, zipimport.zipimporter)
        self.assertFalse(spec.loader.is_package(TESTMOD))
        load_mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(load_mod)
        self.assertEqual(
            spec.loader.get_filename(TESTMOD), load_mod.__file__)

        mod_path = TESTPACK2 + os.sep + TESTMOD
        mod_name = module_path_to_dotted_name(mod_path)
        mod = importlib.import_module(mod_name)
        self.assertTrue(mod_name in sys.modules)
        self.assertIsNone(zi.get_source(TESTPACK2))
        self.assertIsNone(zi.get_source(mod_path))
        self.assertEqual(zi.get_filename(mod_path), mod.__file__)
        # To pass in the module name instead of the path, we must use the
        # right importer.
        loader = mod.__loader__
        self.assertIsNone(loader.get_source(mod_name))
        self.assertEqual(loader.get_filename(mod_name), mod.__file__)

    def testGetData(self):
        self.addCleanup(os_helper.unlink, TEMP_ZIP)
        with ZipFile(TEMP_ZIP, "w") as z:
            z.compression = self.compression
            name = "testdata.dat"
            data = bytes(x for x in range(256))
            z.writestr(name, data)

        zi = zipimport.zipimporter(TEMP_ZIP)
        self.assertEqual(data, zi.get_data(name))
        self.assertIn('zipimporter object', repr(zi))

    def testImporterAttr(self):
        src = """if 1:  # indent hack
        def get_file():
            return __file__
        if __loader__.get_data("some.data") != b"some data":
            raise AssertionError("bad data")\n"""
        pyc = make_pyc(compile(src, "<???>", "exec"), NOW, len(src))
        files = {TESTMOD + pyc_ext: (NOW, pyc),
                 "some.data": (NOW, "some data")}
        self.doTest(pyc_ext, files, TESTMOD)

    def testDefaultOptimizationLevel(self):
        # zipimport should use the default optimization level (#28131)
        src = """if 1:  # indent hack
        def test(val):
            assert(val)
            return val\n"""
        files = {TESTMOD + '.py': (NOW, src)}
        self.makeZip(files)
        sys.path.insert(0, TEMP_ZIP)
        mod = importlib.import_module(TESTMOD)
        self.assertEqual(mod.test(1), 1)
        if __debug__:
            self.assertRaises(AssertionError, mod.test, False)
        else:
            self.assertEqual(mod.test(0), 0)

    def testImport_WithStuff(self):
        # try importing from a zipfile which contains additional
        # stuff at the beginning of the file
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD,
                    stuff=b"Some Stuff"*31)

    def assertModuleSource(self, module):
        self.assertEqual(inspect.getsource(module), test_src)

    def testGetSource(self):
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD, call=self.assertModuleSource)

    def testGetCompiledSource(self):
        pyc = make_pyc(compile(test_src, "<???>", "exec"), NOW, len(test_src))
        files = {TESTMOD + ".py": (NOW, test_src),
                 TESTMOD + pyc_ext: (NOW, pyc)}
        self.doTest(pyc_ext, files, TESTMOD, call=self.assertModuleSource)

    def runDoctest(self, callback):
        files = {TESTMOD + ".py": (NOW, test_src),
                 "xyz.txt": (NOW, ">>> log.append(True)\n")}
        self.doTest(".py", files, TESTMOD, call=callback)

    def doDoctestFile(self, module):
        log = []
        old_master, doctest.master = doctest.master, None
        try:
            doctest.testfile(
                'xyz.txt', package=module, module_relative=True,
                globs=locals()
            )
        finally:
            doctest.master = old_master
        self.assertEqual(log,[True])

    def testDoctestFile(self):
        self.runDoctest(self.doDoctestFile)

    def doDoctestSuite(self, module):
        log = []
        doctest.DocFileTest(
            'xyz.txt', package=module, module_relative=True,
            globs=locals()
        ).run()
        self.assertEqual(log,[True])

    def testDoctestSuite(self):
        self.runDoctest(self.doDoctestSuite)

    def doTraceback(self, module):
        try:
            module.do_raise()
        except Exception as e:
            tb = e.__traceback__.tb_next

            f,lno,n,line = extract_tb(tb, 1)[0]
            self.assertEqual(line, raise_src.strip())

            f,lno,n,line = extract_stack(tb.tb_frame, 1)[0]
            self.assertEqual(line, raise_src.strip())

            s = io.StringIO()
            print_tb(tb, 1, s)
            self.assertTrue(s.getvalue().endswith(
                '    def do_raise(): raise TypeError\n'
                '' if support.has_no_debug_ranges() else
                '                    ^^^^^^^^^^^^^^^\n'
            ))
        else:
            raise AssertionError("This ought to be impossible")

    def testTraceback(self):
        files = {TESTMOD + ".py": (NOW, raise_src)}
        self.doTest(None, files, TESTMOD, call=self.doTraceback)

    @unittest.skipIf(os_helper.TESTFN_UNENCODABLE is None,
                     "need an unencodable filename")
    def testUnencodable(self):
        filename = os_helper.TESTFN_UNENCODABLE + ".zip"
        self.addCleanup(os_helper.unlink, filename)
        with ZipFile(filename, "w") as z:
            zinfo = ZipInfo(TESTMOD + ".py", time.localtime(NOW))
            zinfo.compress_type = self.compression
            z.writestr(zinfo, test_src)
        spec = zipimport.zipimporter(filename).find_spec(TESTMOD)
        mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(mod)

    def testBytesPath(self):
        filename = os_helper.TESTFN + ".zip"
        self.addCleanup(os_helper.unlink, filename)
        with ZipFile(filename, "w") as z:
            zinfo = ZipInfo(TESTMOD + ".py", time.localtime(NOW))
            zinfo.compress_type = self.compression
            z.writestr(zinfo, test_src)

        zipimport.zipimporter(filename)
        with self.assertRaises(TypeError):
            zipimport.zipimporter(os.fsencode(filename))
        with self.assertRaises(TypeError):
            zipimport.zipimporter(bytearray(os.fsencode(filename)))
        with self.assertRaises(TypeError):
            zipimport.zipimporter(memoryview(os.fsencode(filename)))

    def testComment(self):
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD, comment=b"comment")

    def testBeginningCruftAndComment(self):
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD, stuff=b"cruft" * 64, comment=b"hi")

    def testLargestPossibleComment(self):
        files = {TESTMOD + ".py": (NOW, test_src)}
        self.doTest(".py", files, TESTMOD, comment=b"c" * ((1 << 16) - 1))


@support.requires_zlib()
class CompressedZipImportTestCase(UncompressedZipImportTestCase):
    compression = ZIP_DEFLATED


class BadFileZipImportTestCase(unittest.TestCase):
    def assertZipFailure(self, filename):
        self.assertRaises(zipimport.ZipImportError,
                          zipimport.zipimporter, filename)

    def testNoFile(self):
        self.assertZipFailure('AdfjdkFJKDFJjdklfjs')

    def testEmptyFilename(self):
        self.assertZipFailure('')

    def testBadArgs(self):
        self.assertRaises(TypeError, zipimport.zipimporter, None)
        self.assertRaises(TypeError, zipimport.zipimporter, TESTMOD, kwd=None)
        self.assertRaises(TypeError, zipimport.zipimporter,
                          list(os.fsencode(TESTMOD)))

    def testFilenameTooLong(self):
        self.assertZipFailure('A' * 33000)

    def testEmptyFile(self):
        os_helper.unlink(TESTMOD)
        os_helper.create_empty_file(TESTMOD)
        self.assertZipFailure(TESTMOD)

    @unittest.skipIf(support.is_wasi, "mode 000 not supported.")
    def testFileUnreadable(self):
        os_helper.unlink(TESTMOD)
        fd = os.open(TESTMOD, os.O_CREAT, 000)
        try:
            os.close(fd)

            with self.assertRaises(zipimport.ZipImportError) as cm:
                zipimport.zipimporter(TESTMOD)
        finally:
            # If we leave "the read-only bit" set on Windows, nothing can
            # delete TESTMOD, and later tests suffer bogus failures.
            os.chmod(TESTMOD, 0o666)
            os_helper.unlink(TESTMOD)

    def testNotZipFile(self):
        os_helper.unlink(TESTMOD)
        fp = open(TESTMOD, 'w+')
        fp.write('a' * 22)
        fp.close()
        self.assertZipFailure(TESTMOD)

    # XXX: disabled until this works on Big-endian machines
    def _testBogusZipFile(self):
        os_helper.unlink(TESTMOD)
        fp = open(TESTMOD, 'w+')
        fp.write(struct.pack('=I', 0x06054B50))
        fp.write('a' * 18)
        fp.close()
        z = zipimport.zipimporter(TESTMOD)

        try:
            with warnings.catch_warnings():
                warnings.simplefilter("ignore", DeprecationWarning)
                self.assertRaises(TypeError, z.load_module, None)
            self.assertRaises(TypeError, z.find_module, None)
            self.assertRaises(TypeError, z.find_spec, None)
            self.assertRaises(TypeError, z.exec_module, None)
            self.assertRaises(TypeError, z.is_package, None)
            self.assertRaises(TypeError, z.get_code, None)
            self.assertRaises(TypeError, z.get_data, None)
            self.assertRaises(TypeError, z.get_source, None)

            error = zipimport.ZipImportError
            self.assertIsNone(z.find_spec('abc'))

            with warnings.catch_warnings():
                warnings.simplefilter("ignore", DeprecationWarning)
                self.assertRaises(error, z.load_module, 'abc')
            self.assertRaises(error, z.get_code, 'abc')
            self.assertRaises(OSError, z.get_data, 'abc')
            self.assertRaises(error, z.get_source, 'abc')
            self.assertRaises(error, z.is_package, 'abc')
        finally:
            zipimport._zip_directory_cache.clear()


def tearDownModule():
    os_helper.unlink(TESTMOD)


if __name__ == "__main__":
    unittest.main()