Add unittest

Add unittest

[   46s] + ./array_queue
[   46s]
[   46s] running 12 tests
[   46s] test capacity ... ok
[   46s] test into_iter ... ok
[   46s] test len_empty_full ... ok
[   46s] test smoke ... ok
[   46s] test linearizable ... ok
[   46s] test len ... ok
[   46s] test zero_capacity - should panic ... ok
[   46s] test mpmc_ring_buffer ... ok
[   46s] test mpmc ... ok
[   46s] test spsc_ring_buffer ... ok
[   46s] test spsc ... ok
[   47s] test drops ... ok
[   47s]
[   47s] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.41s
[   47s]
[   47s] + for unit_test in '${unit_test_list}'
[   47s] + ./seg_queue
[   47s]
[   47s] running 8 tests
[   47s] test into_iter ... ok
[   47s] test len ... ok
[   47s] test len_empty_full ... ok
[   47s] test into_iter_drop ... ok
[   47s] test smoke ... ok
[   47s] test spsc ... ok
[   47s] test mpmc ... ok
[   47s] test drops ... ok
[   47s]
[   47s] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.33s