[GSoC][PATCH v3 0/7] t: port reftable/merged_test.c to the unit testing framework

[Chandra Pratap <chandrapratap3519@gmail.com>]

In the recent codebase update (commit 8bf6fbd, 2023-12-09), a new unit
testing framework written entirely in C was introduced to the Git project
aimed at simplifying testing and reducing test run times.
Currently, tests for the reftable refs-backend are performed by a custom
testing framework defined by reftable/test_framework.{c, h}. Port
reftable/merged_test.c to the unit testing framework and improve upon
the ported test.

The first patch in the series moves the test to the unit testing framework,
and the rest of the patches improve upon the ported test.

Mentored-by: Patrick Steinhardt <ps@pks.im>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Chandra Pratap <chandrapratap3519@gmail.com>

---
Changes in v3:
- Remove merged_test_main() from reftable/reftable-tests.h
- Fix a typo in patch 7

CI/PR: https://github.com/gitgitgadget/git/pull/1755

Chandra Pratap (7):
[PATCH 1/7] t: move reftable/merged_test.c to the unit testing framework
[PATCH 2/7] t: harmonize t-reftable-merged.c with coding guidelines
[PATCH 3/7] t-reftable-merged: improve the test for t_merged_single_record()
[PATCH 4/7] t-reftable-merged: improve the const-correctness of helper functions
[PATCH 5/7] t-reftable-merged: add tests for reftable_merged_table_max_update_index
[PATCH 6/7] t-reftable-merged: use reftable_ref_record_equal to compare ref records
[PATCH 7/7] t-reftable-merged: add test for REFTABLE_FORMAT_ERROR

Makefile                                                   |   2 +-
t/helper/test-reftable.c                                   |   1 -
reftable/reftable-tests.h				   |   1 -
reftable/merged_test.c => t/unit-tests/t-reftable-merged.c | 202 +++++++++++++++----------------
4 files changed, 103 insertions(+), 103 deletions(-)

Range-diff against v2:
1:  0d71deffad ! 1:  9c9fbaf75c t: move reftable/merged_test.c to the unit testing framework
    @@ Makefile: REFTABLE_OBJS += reftable/writer.o
      REFTABLE_TEST_OBJS += reftable/record_test.o
      REFTABLE_TEST_OBJS += reftable/readwrite_test.o

    + ## reftable/reftable-tests.h ##
    +@@ reftable/reftable-tests.h: license that can be found in the LICENSE file or at
    +
    + int basics_test_main(int argc, const char **argv);
    + int block_test_main(int argc, const char **argv);
    +-int merged_test_main(int argc, const char **argv);
    + int pq_test_main(int argc, const char **argv);
    + int record_test_main(int argc, const char **argv);
    + int readwrite_test_main(int argc, const char **argv);
    +
      ## t/helper/test-reftable.c ##
     @@ t/helper/test-reftable.c: int cmd__reftable(int argc, const char **argv)
      	tree_test_main(argc, argv);
2:  a449e2edcf = 2:  08c993f5f6 t: harmonize t-reftable-merged.c with coding guidelines
3:  20fb20bb59 = 3:  fa3085bd9b t-reftable-merged: improve the test t_merged_single_record()
4:  617f668b08 = 4:  d491c1f383 t-reftable-merged: improve the const-correctness of helper functions
5:  bf51af687f = 5:  ee9909f7ce t-reftable-merged: add tests for reftable_merged_table_max_update_index
6:  e2b8f6b3fe = 6:  5ce16e9cfc t-reftable-merged: use reftable_ref_record_equal to compare ref records
7:  b606d67ee7 ! 7:  d090e9ca5b t-reftable-merged: add test for REFTABLE_FORMAT_ERROR
    @@ Commit message
         t-reftable-merged: add test for REFTABLE_FORMAT_ERROR

         When calling reftable_new_merged_table(), if the hash ID of the
    -    passsed reftable_table parameter doesn't match the passed hash_id
    +    passed reftable_table parameter doesn't match the passed hash_id
         parameter, a REFTABLE_FORMAT_ERROR is thrown. This case is
         currently left unexercised, so add a test for the same.