test_unicode_file.py

# Test some Unicode file name semantics
# We dont test many operations on files other than
# that their names can be used with Unicode characters.
import os, glob, time, shutil
import unicodedata

import unittest
from test.test_support import run_unittest, TestSkipped, TESTFN_UNICODE
from test.test_support import TESTFN_ENCODING, TESTFN_UNICODE_UNENCODEABLE
try:
    TESTFN_ENCODED = TESTFN_UNICODE.encode(TESTFN_ENCODING)
except (UnicodeError, TypeError):
    # Either the file system encoding is None, or the file name
    # cannot be encoded in the file system encoding.
    raise TestSkipped("No Unicode filesystem semantics on this platform.")

if TESTFN_ENCODED.decode(TESTFN_ENCODING) != TESTFN_UNICODE:
    # The file system encoding does not support Latin-1
    # (which test_support assumes), so try the file system
    # encoding instead.
    import sys
    try:
        TESTFN_UNICODE = unicode("@test-\xe0\xf2", sys.getfilesystemencoding())
        TESTFN_ENCODED = TESTFN_UNICODE.encode(TESTFN_ENCODING)
        if '?' in TESTFN_ENCODED:
            # MBCS will not report the error properly
            raise UnicodeError, "mbcs encoding problem"
    except (UnicodeError, TypeError):
        raise TestSkipped("Cannot find a suiteable filename.")

if TESTFN_ENCODED.decode(TESTFN_ENCODING) != TESTFN_UNICODE:
    raise TestSkipped("Cannot find a suitable filename.")

def remove_if_exists(filename):
    if os.path.exists(filename):
        os.unlink(filename)

class TestUnicodeFiles(unittest.TestCase):
    # The 'do_' functions are the actual tests.  They generally assume the
    # file already exists etc.

    # Do all the tests we can given only a single filename.  The file should
    # exist.
    def _do_single(self, filename):
        self.failUnless(os.path.exists(filename))
        self.failUnless(os.path.isfile(filename))
        self.failUnless(os.access(filename, os.R_OK))
        self.failUnless(os.path.exists(os.path.abspath(filename)))
        self.failUnless(os.path.isfile(os.path.abspath(filename)))
        self.failUnless(os.access(os.path.abspath(filename), os.R_OK))
        os.chmod(filename, 0777)
        os.utime(filename, None)
        os.utime(filename, (time.time(), time.time()))
        # Copy/rename etc tests using the same filename
        self._do_copyish(filename, filename)
        # Filename should appear in glob output
        self.failUnless(
            os.path.abspath(filename)==os.path.abspath(glob.glob(filename)[0]))
        # basename should appear in listdir.
        path, base = os.path.split(os.path.abspath(filename))
        if isinstance(base, str):
            base = base.decode(TESTFN_ENCODING)
        file_list = os.listdir(path)
        # listdir() with a unicode arg may or may not return Unicode
        # objects, depending on the platform.
        if file_list and isinstance(file_list[0], str):
            file_list = [f.decode(TESTFN_ENCODING) for f in file_list]

        # Normalize the unicode strings, as round-tripping the name via the OS
        # may return a different (but equivalent) value.
        base = unicodedata.normalize("NFD", base)
        file_list = [unicodedata.normalize("NFD", f) for f in file_list]

        self.failUnless(base in file_list)

    # Do as many "equivalancy' tests as we can - ie, check that although we
    # have different types for the filename, they refer to the same file.
    def _do_equivalent(self, filename1, filename2):
        # Note we only check "filename1 against filename2" - we don't bother
        # checking "filename2 against 1", as we assume we are called again with
        # the args reversed.
        self.failUnless(type(filename1)!=type(filename2),
                    "No point checking equivalent filenames of the same type")
        # stat and lstat should return the same results.
        self.failUnlessEqual(os.stat(filename1),
                             os.stat(filename2))
        self.failUnlessEqual(os.lstat(filename1),
                             os.lstat(filename2))
        # Copy/rename etc tests using equivalent filename
        self._do_copyish(filename1, filename2)

    # Tests that copy, move, etc one file to another.
    def _do_copyish(self, filename1, filename2):
        # Should be able to rename the file using either name.
        self.failUnless(os.path.isfile(filename1)) # must exist.
        os.rename(filename1, filename2 + ".new")
        self.failUnless(os.path.isfile(filename1+".new"))
        os.rename(filename1 + ".new", filename2)
        self.failUnless(os.path.isfile(filename2))

        shutil.copy(filename1, filename2 + ".new")
        os.unlink(filename1 + ".new") # remove using equiv name.
        # And a couple of moves, one using each name.
        shutil.move(filename1, filename2 + ".new")
        self.failUnless(not os.path.exists(filename2))
        shutil.move(filename1 + ".new", filename2)
        self.failUnless(os.path.exists(filename1))
        # Note - due to the implementation of shutil.move,
        # it tries a rename first.  This only fails on Windows when on
        # different file systems - and this test can't ensure that.
        # So we test the shutil.copy2 function, which is the thing most
        # likely to fail.
        shutil.copy2(filename1, filename2 + ".new")
        os.unlink(filename1 + ".new")

    def _do_directory(self, make_name, chdir_name, encoded):
        cwd = os.getcwd()
        if os.path.isdir(make_name):
            os.rmdir(make_name)
        os.mkdir(make_name)
        try:
            os.chdir(chdir_name)
            try:
                if not encoded:
                    cwd_result = os.getcwdu()
                    name_result = make_name
                else:
                    cwd_result = os.getcwd().decode(TESTFN_ENCODING)
                    name_result = make_name.decode(TESTFN_ENCODING)

                cwd_result = unicodedata.normalize("NFD", cwd_result)
                name_result = unicodedata.normalize("NFD", name_result)

                self.failUnlessEqual(os.path.basename(cwd_result),name_result)
            finally:
                os.chdir(cwd)
        finally:
            os.rmdir(make_name)

    # The '_test' functions 'entry points with params' - ie, what the
    # top-level 'test' functions would be if they could take params
    def _test_single(self, filename):
        remove_if_exists(filename)
        f = file(filename, "w")
        f.close()
        try:
            self._do_single(filename)
        finally:
            os.unlink(filename)
        self.failUnless(not os.path.exists(filename))
        # and again with os.open.
        f = os.open(filename, os.O_CREAT)
        os.close(f)
        try:
            self._do_single(filename)
        finally:
            os.unlink(filename)

    def _test_equivalent(self, filename1, filename2):
        remove_if_exists(filename1)
        self.failUnless(not os.path.exists(filename2))
        f = file(filename1, "w")
        f.close()
        try:
            self._do_equivalent(filename1, filename2)
        finally:
            os.unlink(filename1)

    # The 'test' functions are unittest entry points, and simply call our
    # _test functions with each of the filename combinations we wish to test
    def test_single_files(self):
        self._test_single(TESTFN_ENCODED)
        self._test_single(TESTFN_UNICODE)
        if TESTFN_UNICODE_UNENCODEABLE is not None:
            self._test_single(TESTFN_UNICODE_UNENCODEABLE)

    def test_equivalent_files(self):
        self._test_equivalent(TESTFN_ENCODED, TESTFN_UNICODE)
        self._test_equivalent(TESTFN_UNICODE, TESTFN_ENCODED)

    def test_directories(self):
        # For all 'equivalent' combinations:
        #  Make dir with encoded, chdir with unicode, checkdir with encoded
        #  (or unicode/encoded/unicode, etc
        ext = ".dir"
        self._do_directory(TESTFN_ENCODED+ext, TESTFN_ENCODED+ext, True)
        self._do_directory(TESTFN_ENCODED+ext, TESTFN_UNICODE+ext, True)
        self._do_directory(TESTFN_UNICODE+ext, TESTFN_ENCODED+ext, False)
        self._do_directory(TESTFN_UNICODE+ext, TESTFN_UNICODE+ext, False)
        # Our directory name that can't use a non-unicode name.
        if TESTFN_UNICODE_UNENCODEABLE is not None:
            self._do_directory(TESTFN_UNICODE_UNENCODEABLE+ext,
                               TESTFN_UNICODE_UNENCODEABLE+ext,
                               False)

def test_main():
    run_unittest(__name__)

if __name__ == "__main__":
    test_main()