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/usr/src/openvswitch-1.4.0/tests/file_name.at is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.

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AT_BANNER([test dir_name and base_name functions])

m4_define([CHECK_FILE_NAME],
  [AT_SETUP([components of "$1" are "$2", "$3"])
   AT_KEYWORDS([dir_name base_name])
   AT_CHECK([test-file_name "AS_ESCAPE($1)"], [0], [$2
$3
])
   AT_CLEANUP])

# These are the test cases given in POSIX for dirname() and basename().
CHECK_FILE_NAME([/usr/lib], [/usr], [lib])
CHECK_FILE_NAME([/usr/], [/], [usr])
CHECK_FILE_NAME([usr], [.], [usr])
CHECK_FILE_NAME([/], [/], [/])
CHECK_FILE_NAME([.], [.], [.])
CHECK_FILE_NAME([..], [.], [..])
CHECK_FILE_NAME([//], [//], [//])       # / is also allowed
CHECK_FILE_NAME([//foo], [//], [foo])   # / is also allowed for dirname
CHECK_FILE_NAME([], [.], [.])

# Additional test cases.
CHECK_FILE_NAME([dir/file], [dir], [file])
CHECK_FILE_NAME([dir/file/], [dir], [file])
CHECK_FILE_NAME([dir/file//], [dir], [file])
CHECK_FILE_NAME([///foo], [/], [foo])