If $TEST_DIRECTORY is specified in the environment, convert the value
to an absolute path to ensure that it remains valid even when 'cd' is
used.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com> Reviewed-by: Richard Hansen <rhansen@bbn.com> Signed-off-by: Richard Hansen <rhansen@bbn.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>