Add unittest

Add unittest

[   59s] + ./async
[   59s]
[   59s] running 13 tests
[   59s] test tcp_peek_read ... ok
[   59s] test shutdown ... ok
[   59s] test tcp_connect ... ok
[   59s] test udp_send_recv ... ok
[   59s] test udp_connect ... ok
[   59s] test uds_send_recv ... ok
[   59s] test uds_send_to_recv_from ... ok
[   59s] test uds_connect ... ok
[   59s] test tcp_duplex ... ok
[   60s] test uds_reader_hangup ... ok
[   60s] test tcp_writer_hangup ... ok
[   60s] test tcp_reader_hangup ... ok
[   60s] test uds_writer_hangup ... ok
[   60s]
[   60s] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.05s
[   60s]
[   60s] + for unit_test in '"async"' '"timer"'
[   60s] + ./timer
[   60s]
[   60s] running 4 tests
[   61s] test poll_across_tasks ... ok
[   61s] test smoke ... ok
[   62s] test interval ... ok
[   63s] test set ... ok
[   63s]
[   63s] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.02s