Add unittest

Add unittest
[   23s] + ./strsim
[   23s]
[   23s] running 88 tests
[   23s] test tests::bigrams_iterator ... ok
[   23s] test tests::damerau_levenshtein_beginning_transposition ... ok
[   23s] test tests::damerau_levenshtein_diff ... ok
[   23s] test tests::damerau_levenshtein_diff_comedians ... ok
[   23s] test tests::damerau_levenshtein_diff_longer ... ok
[   23s] test tests::damerau_levenshtein_diff_multibyte ... ok
[   23s] test tests::damerau_levenshtein_diff_reversed ... ok
[   23s] test tests::damerau_levenshtein_diff_short ... ok
[   23s] test tests::damerau_levenshtein_diff_unequal_length ... ok
[   23s] test tests::damerau_levenshtein_diff_unequal_length_reversed ... ok
[   23s] test tests::damerau_levenshtein_second_empty ... ok
[   23s] test tests::damerau_levenshtein_empty ... ok
[   23s] test tests::damerau_levenshtein_many_transpositions ... ok
[   23s] test tests::damerau_levenshtein_end_transposition ... ok
[   23s] test tests::damerau_levenshtein_first_empty ... ok
[   23s] test tests::damerau_levenshtein_same ... ok
[   23s] test tests::damerau_levenshtein_unrestricted_edit ... ok
[   23s] test tests::generic_jaro_diff ... ok
[   23s] test tests::hamming_diff ... ok
[   23s] test tests::hamming_diff_multibyte ... ok
[   23s] test tests::hamming_empty ... ok
[   23s] test tests::hamming_names ... ok
[   23s] test tests::hamming_numbers ... ok
[   23s] test tests::hamming_same ... ok
[   23s] test tests::hamming_unequal_length ... ok
[   23s] test tests::jaro_both_empty ... ok
[   23s] test tests::jaro_diff_no_transposition ... ok
[   23s] test tests::jaro_diff_one_and_two ... ok
[   23s] test tests::jaro_diff_short ... ok
[   23s] test tests::jaro_diff_two_and_one ... ok
[   23s] test tests::jaro_diff_one_character ... ok
[   23s] test tests::jaro_diff_with_transposition ... ok
[   23s] test tests::jaro_multibyte ... ok
[   23s] test tests::jaro_names ... ok
[   23s] test tests::jaro_same ... ok
[   23s] test tests::jaro_first_empty ... ok
[   23s] test tests::jaro_same_one_character ... ok
[   23s] test tests::jaro_second_empty ... ok
[   23s] test tests::jaro_winkler_diff_with_transposition ... ok
[   23s] test tests::jaro_winkler_both_empty ... ok
[   23s] test tests::jaro_winkler_diff_one_character ... ok
[   23s] test tests::jaro_winkler_diff_no_transposition ... ok
[   23s] test tests::jaro_winkler_length_of_one ... ok
[   23s] test tests::jaro_winkler_multibyte ... ok
[   23s] test tests::jaro_winkler_same ... ok
[   23s] test tests::levenshtein_diff_multibyte ... ok
[   23s] test tests::jaro_winkler_names ... ok
[   23s] test tests::jaro_winkler_same_one_character ... ok
[   23s] test tests::levenshtein_diff_longer ... ok
[   23s] test tests::jaro_winkler_diff_short ... ok
[   23s] test tests::jaro_winkler_second_empty ... ok
[   23s] test tests::jaro_winkler_very_long_prefix ... ok
[   23s] test tests::jaro_winkler_long_prefix ... ok
[   23s] test tests::jaro_winkler_first_empty ... ok
[   23s] test tests::jaro_winkler_more_names ... ok
[   23s] test tests::levenshtein_diff_short ... ok
[   23s] test tests::levenshtein_diff_with_space ... ok
[   23s] test tests::levenshtein_empty ... ok
[   23s] test tests::levenshtein_first_empty ... ok
[   23s] test tests::levenshtein_same ... ok
[   23s] test tests::levenshtein_second_empty ... ok
[   23s] test tests::normalized_damerau_levenshtein_diff_short ... ok
[   23s] test tests::normalized_damerau_levenshtein_first_empty ... ok
[   23s] test tests::normalized_damerau_levenshtein_for_empty_strings ... ok
[   23s] test tests::normalized_damerau_levenshtein_identical_strings ... ok
[   23s] test tests::normalized_damerau_levenshtein_second_empty ... ok
[   23s] test tests::normalized_levenshtein_diff_short ... ok
[   23s] test tests::normalized_levenshtein_first_empty ... ok
[   23s] test tests::normalized_levenshtein_identical_strings ... ok
[   23s] test tests::normalized_levenshtein_second_empty ... ok
[   23s] test tests::normalized_levenshtein_for_empty_strings ... ok
[   23s] test tests::osa_distance_beginning_transposition ... ok
[   23s] test tests::osa_distance_diff ... ok
[   23s] test tests::osa_distance_diff_comedians ... ok
[   23s] test tests::osa_distance_diff_multibyte ... ok
[   23s] test tests::osa_distance_diff_reversed ... ok
[   23s] test tests::osa_distance_diff_unequal_length_reversed ... ok
[   23s] test tests::osa_distance_diff_longer ... ok
[   23s] test tests::osa_distance_diff_unequal_length ... ok
[   23s] test tests::osa_distance_first_empty ... ok
[   23s] test tests::osa_distance_many_transpositions ... ok
[   23s] test tests::osa_distance_second_empty ... ok
[   23s] test tests::osa_distance_empty ... ok
[   23s] test tests::osa_distance_end_transposition ... ok
[   23s] test tests::osa_distance_diff_short ... ok
[   23s] test tests::osa_distance_restricted_edit ... ok
[   23s] test tests::osa_distance_same ... ok
[   23s] test tests::sorensen_dice_all ... ok
[   23s]
[   23s] test result: ok. 88 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.10s