[PATCH v3 0/4] mergesort: move tests to Clar and remove the helper

Move the mergesort checks from the shell test and helper into Clar, where the tests call the sort functions directly.

Simplify the old distribution/mode grid to direct tests for sorted, reversed, equal-value and repeatable random input. Keep the checks for sorted values, the original order of equal values, and list length. Add empty and small-list cases and a check of the debug hooks separately. The final tests cover fewer input combinations than the old certification test.

Retire p0071, the benchmark used to compare sorting implementations. This removes the last user of the mergesort helper, so remove that too.

The migration, simplification, additional tests and benchmark removal are separate commits.

Changes since v2:

* Drop the leak-fix patch, since this series removes the helper.
* Simplify the test inputs and remove the distribution/mode tables.
* Put the additional tests in their own commit.
* Rewrite the commit messages to explain the changes more clearly.

Muhammed Dilshad A (4):
  mergesort: move sorting tests to Clar
  mergesort: simplify the unit tests
  mergesort: cover empty and small lists
  t: retire the sorting benchmark and mergesort helper

 Makefile                   |   2 +-
 t/helper/meson.build       |   1 -
 t/helper/test-mergesort.c  | 408 -------------------------------------
 t/helper/test-tool.c       |   1 -
 t/helper/test-tool.h       |   1 -
 t/meson.build              |   3 +-
 t/perf/p0071-sort.sh       |  52 -----
 t/t0071-sort.sh            |  11 -
 t/unit-tests/u-mergesort.c | 168 +++++++++++++++
 9 files changed, 170 insertions(+), 477 deletions(-)
 delete mode 100644 t/helper/test-mergesort.c
 delete mode 100755 t/perf/p0071-sort.sh
 delete mode 100755 t/t0071-sort.sh
 create mode 100644 t/unit-tests/u-mergesort.c

base-commit: 6de20f6092dcf9bdb1c8efe03db4b70c82b423dd