t-reftable-pq: add test for index based comparison

When comparing two entries, the priority queue as defined by
reftable/pq.{c, h} first compares the entries on the basis of
their ref-record's keys. If the keys turn out to be equal, the
comparison is then made on the basis of their update indices
(which are never equal).

In the current testing setup, only the case for comparison on
the basis of ref-record's keys is exercised. Add a test for
index-based comparison as well. Rename the existing test to
reflect its nature of only testing record-based comparison.

While at it, replace 'strbuf_detach' with 'xstrfmt' to assign
refnames in the existing test. This makes the test conciser.

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

t/unit-tests/t-reftable-pq.c

@@ -18,19 +18,16 @@ static void merged_iter_pqueue_check(const struct merged_iter_pqueue *pq)
 	}
 }
 
-static void t_pq(void)
+static void t_pq_record(void)
 {
 	struct merged_iter_pqueue pq = { 0 };
 	struct reftable_record recs[54];
 	size_t N = ARRAY_SIZE(recs) - 1, i;
 	char *last = NULL;
 
 	for (i = 0; i < N; i++) {
-		struct strbuf refname = STRBUF_INIT;
-		strbuf_addf(&refname, "%02"PRIuMAX, (uintmax_t)i);
-
 		reftable_record_init(&recs[i], BLOCK_TYPE_REF);
-		recs[i].u.ref.refname = strbuf_detach(&refname, NULL);
+		recs[i].u.ref.refname = xstrfmt("%02"PRIuMAX, (uintmax_t)i);
 	}
 
 	i = 1;
@@ -59,9 +56,48 @@ static void t_pq(void)
 	merged_iter_pqueue_release(&pq);
 }
 
+static void t_pq_index(void)
+{
+	struct merged_iter_pqueue pq = { 0 };
+	struct reftable_record recs[13];
+	char *last = NULL;
+	size_t N = ARRAY_SIZE(recs), i;
+
+	for (i = 0; i < N; i++) {
+		reftable_record_init(&recs[i], BLOCK_TYPE_REF);
+		recs[i].u.ref.refname = (char *) "refs/heads/master";
+	}
+
+	i = 1;
+	do {
+		struct pq_entry e = {
+			.rec = &recs[i],
+			.index = i,
+		};
+
+		merged_iter_pqueue_add(&pq, &e);
+		merged_iter_pqueue_check(&pq);
+		i = (i * 7) % N;
+	} while (i != 1);
+
+	for (i = N - 1; i > 0; i--) {
+		struct pq_entry e = merged_iter_pqueue_remove(&pq);
+		merged_iter_pqueue_check(&pq);
+
+		check(reftable_record_type(e.rec) == BLOCK_TYPE_REF);
+		check_int(e.index, ==, i);
+		if (last)
+			check_str(last, e.rec->u.ref.refname);
+		last = e.rec->u.ref.refname;
+	}
+
+	merged_iter_pqueue_release(&pq);
+}
+
 int cmd_main(int argc, const char *argv[])
 {
-	TEST(t_pq(), "pq works");
+	TEST(t_pq_record(), "pq works with record-based comparison");
+	TEST(t_pq_index(), "pq works with index-based comparison");
 
 	return test_done();
 }