From: Chandra Pratap <chandrapratap3519@gmail.com>

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>

Submitted-As: https://lore.kernel.org/git/pull.1642.v4.git.1705865326185.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1642.git.1705219829965.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1642.v2.git.1705220304781.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1642.v3.git.1705502304219.gitgitgadget@gmail.com