reftable_ref_record_compare_name() is a function defined by
reftable/record.{c, h} and is used to compare the refname of two
ref records when sorting multiple ref records using 'qsort'.
In the current testing setup, this function is left unexercised.
Add a testing function for the same.

Mentored-by: Patrick Steinhardt [off-list ref]
Mentored-by: Christian Couder [off-list ref]
Signed-off-by: Chandra Pratap <redacted>
---
 t/unit-tests/t-reftable-record.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/t/unit-tests/t-reftable-record.c b/t/unit-tests/t-reftable-record.c
index 99ebfafe0b..b949617c88 100644
--- a/t/unit-tests/t-reftable-record.c
+++ b/t/unit-tests/t-reftable-record.c

@@ -101,6 +101,23 @@ static void test_reftable_ref_record_comparison(void)
 		reftable_record_release(&in[i]);
 }

+static void test_reftable_ref_record_compare_name(void)
+{
+	struct reftable_ref_record recs[14] = { 0 };
+	size_t N = ARRAY_SIZE(recs), i;
+
+	for (i = 0; i < N; i++)
+		recs[i].refname = xstrfmt("%02"PRIuMAX, (uintmax_t)i);
+
+	QSORT(recs, N, reftable_ref_record_compare_name);
+
+	for (i = 1; i < N; i++)
+		check(reftable_ref_record_compare_name(&recs[i - 1], &recs[i]) < 0);
+

+	for (i = 0; i < N; i++)
+		reftable_ref_record_release(&recs[i]);
+}
+
 static void test_reftable_ref_record_roundtrip(void)
 {
 	struct strbuf scratch = STRBUF_INIT;

@@ -501,6 +518,7 @@ int cmd_main(int argc, const char *argv[])
 	TEST(test_reftable_log_record_comparison(), "comparison operations work on log record");
 	TEST(test_reftable_index_record_comparison(), "comparison operations work on index record");
 	TEST(test_reftable_obj_record_comparison(), "comparison operations work on obj record");
+	TEST(test_reftable_ref_record_compare_name(), "reftable_ref_record_compare_name works");
 	TEST(test_reftable_log_record_roundtrip(), "record operations work on log record");
 	TEST(test_reftable_ref_record_roundtrip(), "record operations work on ref record");
 	TEST(test_varint_roundtrip(), "put_var_int and get_var_int work");
--

2.45.2.404.g9eaef5822c