t-reftable-block: add tests for obj blocks

In the current testing setup, block operations are left unexercised
for obj blocks. Add a test that exercises these operations for obj
blocks.

Mentored-by: Patrick Steinhardt <[email protected]>
Mentored-by: Christian Couder <[email protected]>
Signed-off-by: Chandra Pratap <[email protected]>

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

@@ -186,9 +186,88 @@ static void t_log_block_read_write(void)
 		reftable_record_release(&recs[i]);
 }
 
+static void t_obj_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 = 1024;
+	struct reftable_block block = { 0 };
+	struct block_writer bw = {
+		.last_key = STRBUF_INIT,
+	};
+	struct reftable_record rec = {
+		.type = BLOCK_TYPE_OBJ,
+	};
+	size_t i = 0;
+	int n;
+	struct block_reader br = { 0 };
+	struct block_iter it = BLOCK_ITER_INIT;
+	struct strbuf want = STRBUF_INIT;
+
+	REFTABLE_CALLOC_ARRAY(block.data, block_size);
+	block.len = block_size;
+	block.source = malloc_block_source();
+	block_writer_init(&bw, BLOCK_TYPE_OBJ, block.data, block_size,
+			  header_off, hash_size(GIT_SHA1_FORMAT_ID));
+
+	for (i = 0; i < N; i++) {
+		uint8_t *bytes = reftable_malloc(sizeof(uint8_t[5]));
+		memcpy(bytes, (uint8_t[]){i, i+1, i+2, i+3, i+5}, sizeof(uint8_t[5]));
+
+		rec.u.obj.hash_prefix = bytes;
+		rec.u.obj.hash_prefix_len = 5;
+
+		recs[i] = rec;
+		n = block_writer_add(&bw, &rec);
+		rec.u.obj.hash_prefix = NULL;
+		rec.u.obj.hash_prefix_len = 0;
+		check_int(n, ==, 0);
+	}
+
+	n = block_writer_finish(&bw);
+	check_int(n, >, 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++) {
+		int r = block_iter_next(&it, &rec);
+		check_int(r, >=, 0);
+		if (r > 0)
+			break;
+		check(reftable_record_equal(&recs[i], &rec, GIT_SHA1_RAWSZ));
+	}
+
+	for (i = 0; i < N; i++) {
+		block_iter_reset(&it);
+		reftable_record_key(&recs[i], &want);
+
+		n = block_iter_seek_key(&it, &br, &want);
+		check_int(n, ==, 0);
+
+		n = block_iter_next(&it, &rec);
+		check_int(n, ==, 0);
+
+		check(reftable_record_equal(&recs[i], &rec, GIT_SHA1_RAWSZ));
+	}
+
+	block_reader_release(&br);
+	block_iter_close(&it);
+	reftable_record_release(&rec);
+	reftable_block_done(&br.block);
+	strbuf_release(&want);
+	for (i = 0; i < N; i++)
+		reftable_record_release(&recs[i]);
+}
+
 int cmd_main(int argc, const char *argv[])
 {
 	TEST(t_log_block_read_write(), "read-write operations on log blocks work");
+	TEST(t_obj_block_read_write(), "read-write operations on obj blocks work");
 	TEST(t_ref_block_read_write(), "read-write operations on ref blocks work");
 
 	return test_done();