run only on case-insensitive filesystems, because collision check at

"hg update" is done only on case-insensitive filesystems

  $ "$TESTDIR/hghave" icasefs || exit 80

setup repository, and target files

  $ HGENCODING=cp932

  $ export HGENCODING

  $ hg init t

  $ cd t

  $ python << EOF

  > names = ["\x83\x41", # cp932(0x83, 0x41='A'), UNICODE(0x30a2)

  >          "\x83\x5A", # cp932(0x83, 0x5A='Z'), UNICODE(0x30bb)

  >          "\x83\x61", # cp932(0x83, 0x61='a'), UNICODE(0x30c2)

  >          "\x83\x7A", # cp932(0x83, 0x7A='z'), UNICODE(0x30db)

  >         ]

  > for num, name in zip(range(len(names)), names):

  >     # file for getting target filename of "hg add"

  >     f = file(str(num), 'w'); f.write(name); f.close()

  >     # target file of "hg add"

  >     f = file(name, 'w'); f.write(name); f.close()

  > EOF

test filename collison check at "hg add"

  $ hg add --config ui.portablefilenames=abort `cat 0`

  $ hg add --config ui.portablefilenames=abort `cat 1`

  $ hg add --config ui.portablefilenames=abort `cat 2`

  $ hg add --config ui.portablefilenames=abort `cat 3`

  $ hg status -a

  A \x83A (esc)

  A \x83Z (esc)

  A \x83a (esc)

  A \x83z (esc)

test filename collision check at "hg update"

  $ hg commit -m 'revision 0'

  $ hg update null

  0 files updated, 0 files merged, 4 files removed, 0 files unresolved

  $ hg update tip

  4 files updated, 0 files merged, 0 files removed, 0 files unresolved