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t/t0009-prio-queue.sh along with t/helper/test-prio-queue.c unit tests Git's implementation of a priority queue. Migrate the test over to the new unit testing framework to simplify debugging and reduce test run-time. Refactor the required logic and add a new test case in addition to porting over the original ones in shell. Signed-off-by: Chandra Pratap <chandrapratap3519@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>