Add unittest

Add unittest
[   29s] + for unit_test in '${unit_test_list}'
[   29s] + ./compiletest
[   29s]
[   29s] running 1 test
[   29s] test ui ... ignored
[   29s]
[   29s] test result: ok. 0 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s
[   29s]
[   29s] + for unit_test in '${unit_test_list}'
[   29s] + ./test_concat
[   29s]
[   29s] running 1 test
[   29s] test test_help ... ok
[   29s]
[   29s] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   29s]
[   29s] + for unit_test in '${unit_test_list}'
[   29s] + ./test_formatdoc
[   29s]
[   29s] running 10 tests
[   30s] test carriage_return ... ok
[   30s] test empty_string ... ok
[   30s] test joined_lines ... ok
[   30s] test joined_first_line ... ok
[   30s] test no_leading_newline ... ok
[   30s] test one_line ... ok
[   30s] test string ... ok
[   30s] test raw_string ... ok
[   30s] test string_trailing_newline ... ok
[   30s] test trailing_whitespace ... ok
[   30s]
[   30s] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[   30s]
[   30s] + for unit_test in '${unit_test_list}'
[   30s] + ./test_indoc
[   30s]
[   30s] running 16 tests
[   30s] test byte_string ... ok
[   30s] test carriage_return ... ok
[   30s] test empty_string ... ok
[   30s] test indoc_as_format_string ... ok
[   30s] test joined_first_line ... ok
[   30s] test joined_lines ... ok
[   30s] test one_line ... ok
[   30s] test no_leading_newline ... ok
[   30s] test raw_string ... ok
[   30s] test raw_byte_string ... ok
[   30s] test string ... ok
[   30s] test string_trailing_newline ... ok
[   30s] test test_global ... ok
[   30s] test test_metavariable ... ok
[   30s] test trailing_comma ... ok
[   30s] test trailing_whitespace ... ok
[   30s]
[   30s] test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[   30s]
[   30s] + for unit_test in '${unit_test_list}'
[   30s] + ./test_unindent
[   30s]
[   30s] running 5 tests
[   30s] test fn_unindent_bytes ... ok
[   30s] test carriage_returns ... ok
[   30s] test fn_unindent_str ... ok
[   30s] test trait_unindent_bytes ... ok
[   30s] test trait_unindent_str ... ok
[   30s]
[   30s] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[   30s]
[   30s] + for unit_test in '${unit_test_list}'
[   30s] + ./test_writedoc
[   30s]
[   30s] running 3 tests
[   30s] test test_angle_bracket_parsing ... ok
[   30s] test test_format_args ... ok
[   30s] test test_write_to_string ... ok
[   30s]
[   30s] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s