t-reftable-block: add tests for log blocks

In the current testing setup, block operations are only exercised
for ref blocks. Add another test that exercises these operations
for log blocks as well.

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

Author: Chandra Pratap

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

@@ -12,7 +12,7 @@ license that can be found in the LICENSE file or at
 #include "reftable/constants.h"
 #include "reftable/reftable-error.h"
 
-static void t_block_read_write(void)
+static void t_ref_block_read_write(void)
 {
 	const int header_off = 21; /* random */
 	struct reftable_record recs[30];
@@ -103,9 +103,98 @@ static void t_block_read_write(void)
 		reftable_record_release(&recs[i]);
 }
 
+static void t_log_block_read_write(void)
+{
+	const int header_off = 21;
+	struct reftable_record recs[30];
+	const size_t N = ARRAY_SIZE(recs);
+	const size_t block_size = 2048;
+	struct reftable_block block = { 0 };
+	struct block_writer bw = {
+		.last_key = STRBUF_INIT,
+	};
+	struct reftable_record rec = {
+		.type = BLOCK_TYPE_LOG,
+	};
+	size_t i = 0;
+	int ret;
+	struct block_reader br = { 0 };
+	struct block_iter it = BLOCK_ITER_INIT;
+	struct strbuf want = STRBUF_INIT, buf = STRBUF_INIT;
+
+	REFTABLE_CALLOC_ARRAY(block.data, block_size);
+	block.len = block_size;
+	block_source_from_strbuf(&block.source ,&buf);
+	block_writer_init(&bw, BLOCK_TYPE_LOG, block.data, block_size,
+			  header_off, hash_size(GIT_SHA1_FORMAT_ID));
+
+	for (i = 0; i < N; i++) {
+		rec.u.log.refname = xstrfmt("branch%02"PRIuMAX , (uintmax_t)i);
+		rec.u.log.update_index = i;
+		rec.u.log.value_type = REFTABLE_LOG_UPDATE;
+
+		recs[i] = rec;
+		ret = block_writer_add(&bw, &rec);
+		rec.u.log.refname = NULL;
+		rec.u.log.value_type = REFTABLE_LOG_DELETION;
+		check_int(ret, ==, 0);
+	}
+
+	ret = block_writer_finish(&bw);
+	check_int(ret, >, 0);
+
+	block_writer_release(&bw);
+
+	block_reader_init(&br, &block, header_off, block_size, GIT_SHA1_RAWSZ);
+
+	block_iter_seek_start(&it, &br);
+
+	for (i = 0; ; i++) {
+		ret = block_iter_next(&it, &rec);
+		check_int(ret, >=, 0);
+		if (ret > 0) {
+			check_int(i, ==, N);
+			break;
+		}
+		check(reftable_record_equal(&recs[i], &rec, GIT_SHA1_RAWSZ));
+	}
+
+	for (i = 0; i < N; i++) {
+		block_iter_reset(&it);
+		strbuf_reset(&want);
+		strbuf_addstr(&want, recs[i].u.log.refname);
+
+		ret = block_iter_seek_key(&it, &br, &want);
+		check_int(ret, ==, 0);
+
+		ret = block_iter_next(&it, &rec);
+		check_int(ret, ==, 0);
+
+		check(reftable_record_equal(&recs[i], &rec, GIT_SHA1_RAWSZ));
+
+		want.len--;
+		ret = block_iter_seek_key(&it, &br, &want);
+		check_int(ret, ==, 0);
+
+		ret = block_iter_next(&it, &rec);
+		check_int(ret, ==, 0);
+		check(reftable_record_equal(&recs[10 * (i / 10)], &rec, GIT_SHA1_RAWSZ));
+	}
+
+	block_reader_release(&br);
+	block_iter_close(&it);
+	reftable_record_release(&rec);
+	reftable_block_done(&br.block);
+	strbuf_release(&want);
+	strbuf_release(&buf);
+	for (i = 0; i < N; i++)
+		reftable_record_release(&recs[i]);
+}
+
 int cmd_main(int argc, const char *argv[])
 {
-	TEST(t_block_read_write(), "read-write operations on blocks work");
+	TEST(t_log_block_read_write(), "read-write operations on log blocks work");
+	TEST(t_ref_block_read_write(), "read-write operations on ref blocks work");
 
 	return test_done();
 }