Merged revisions 79420 via svnmerge from

Merged revisions 79420 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r79420 | victor.stinner | 2010-03-25 13:24:38 +0100 (jeu., 25 mars 2010) | 10 lines

  Fix my test introduced in test_sys by r79394:

  Restore the orginal filesystem encoding before testing
  assertRaises(LookupError, sys.setfilesystemencoding, "xxx"). Unittest formats
  the exception, but the formatting failed because the file system was invalid
  (set to iso-8859-1 by the previous test).

  Anyway, ensure to restore the original filesystem encoding when exiting
  test_setfilesystemencoding() to avoid error propagation to the other tests.
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