test: update tests

core-test/ringbuffers.c

@@ -43,6 +43,7 @@ int main(void)
 	b_ringbuffer_write(buf, s, s_len, &nr_written);
 	read_available = b_ringbuffer_available_data_remaining(buf);
 	write_available = b_ringbuffer_write_capacity_remaining(buf);
+	printf("nr written: %zu\n", nr_written);
 	printf("read available: %zu\n", read_available);
 	printf("write available: %zu\n", write_available);
 	assert(read_available == BUF_SIZE - 1);
@@ -60,7 +61,7 @@ int main(void)
 	assert(read_available == 0);
 	assert(write_available == BUF_SIZE - 1);
 
-	b_ringbuffer_destroy(buf);
+	b_ringbuffer_unref(buf);
 
 	return 0;
 }