Add unittest

Add unittest

[   55s] + ./convert_case
[   55s]
[   55s] running 41 tests
[   55s] test case::test::all_cases_in_iter ... ok
[   55s] test converter::test::add_boundaries ... ok
[   55s] test converter::test::add_boundary ... ok
[   55s] test converter::test::custom_delim ... ok
[   55s] test converter::test::custom_pattern ... ok
[   55s] test converter::test::no_delim ... ok
[   55s] test converter::test::explicit_boundaries ... ok
[   55s] test converter::test::no_digit_boundaries ... ok
[   55s] test converter::test::no_pattern ... ok
[   55s] test converter::test::remove_boundary ... ok
[   55s] test pattern::test::mutate_empty_strings ... ok
[   55s] test converter::test::reuse_after_change ... ok
[   55s] test converter::test::snake_converter_from_case ... ok
[   55s] test converter::test::snake_converter_from_scratch ... ok
[   55s] test pattern::test::pseudo_no_triples ... ok
[   55s] test pattern::test::randoms_are_random ... ok
[   55s] test segmentation::test::all_boundaries_in_iter ... ok
[   55s] test segmentation::test::boundaries_found_in_string ... ok
[   55s] test segmentation::test::split_on_delims ... ok
[   55s] test test::accent_mark ... ok
[   55s] test test::alternating_ignore_symbols ... ok
[   55s] test test::camel_case_acroynms ... ok
[   55s] test test::default_all_boundaries ... ok
[   55s] test test::double_delimeters ... ok
[   55s] test test::detect_many_cases ... ok
[   55s] test test::early_word_boundaries ... ok
[   55s] test test::empty_string ... ok
[   55s] test test::late_word_boundaries ... ok
[   55s] test test::leading_tailing_delimeters ... ok
[   55s] test test::multiline_strings ... ok
[   55s] test test::multiple_from_case ... ok
[   55s] test test::obvious_default_parsing ... ok
[   55s] test test::owned_string ... ok
[   55s] test test::random_case_boundaries ... ok
[   55s] test test::lossless_against_lossless ... ok
[   55s] test test::detect_each_case ... ok
[   55s] test test::remove_boundaries ... ok
[   55s] test test::russian ... ok
[   55s] test test::string_is_kebab ... ok
[   55s] test test::string_is_snake ... ok
[   55s] test test::with_boundaries ... ok
[   55s]
[   55s] test result: ok. 41 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s