Add unittest

Add unittest

[   15s] + ./mcg128xsl64
[   15s]
[   15s] running 3 tests
[   15s] test test_mcg128xsl64_advancing ... ok
[   15s] test test_mcg128xsl64_construction ... ok
[   15s] test test_mcg128xsl64_true_values ... ok
[   15s]
[   15s] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   15s]
[   15s] + for unit_test in '${unit_test_list}'
[   15s] + ./lcg64xsh32
[   15s]
[   15s] running 3 tests
[   15s] test test_lcg64xsh32_advancing ... ok
[   15s] test test_lcg64xsh32_construction ... ok
[   15s] test test_lcg64xsh32_true_values ... ok
[   15s]
[   15s] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   15s]
[   15s] + for unit_test in '${unit_test_list}'
[   15s] + ./lcg128xsl64
[   15s]
[   15s] running 3 tests
[   15s] test test_lcg128xsl64_advancing ... ok
[   15s] test test_lcg128xsl64_construction ... ok
[   15s] test test_lcg128xsl64_true_values ... ok
[   15s]
[   15s] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s