t1001: replace 'test -f' with 'test_path_is_file'
'test_path_is_file' is a modern path checking method in Git's development.
Replace the basic shell command 'test -f' with this approach.
Signed-off-by: Rodrigo Carvalho <rodrigorsdc@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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