Add unittest

Add unittest

[   16s] + ./integration
[   16s]
[   16s] running 2 tests
[   16s] test test_empty ... ok
[   16s] test test_created ... ok
[   16s]
[   16s] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   16s]
[   16s] + for unit_test in '${unit_test_list}'
[   16s] + ./localization
[   16s]
[   16s] running 0 tests
[   16s]
[   16s] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[   16s]
[   16s] + for unit_test in '${unit_test_list}'
[   16s] + ./windows
[   16s]
[   16s] running 0 tests
[   16s]
[   16s] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[   16s]
[   16s] + for unit_test in '${unit_test_list}'
[   16s] + ./rust
[   16s]
[   16s] running 1 test
[   16s] test test_simple ... ok
[   16s]
[   16s] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   16s]
[   16s] + for unit_test in '${unit_test_list}'
[   16s] + ./edge_cases
[   16s]
[   16s] running 0 tests
[   16s]
[   16s] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s