fix missing filename in token tests

[codecov[bot]]

Codecov Report

Merging #313 (c682037) into master (9456888) will not change coverage. The diff coverage is 100.00%.

Additional details and impacted files

[](https://codecov.io/gh/dlang-community/D-YAML/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community) ```diff @@ Coverage Diff @@ ## master #313 +/- ## ======================================= Coverage 95.20% 95.20% ======================================= Files 29 29 Lines 4569 4569 ======================================= Hits 4350 4350 Misses 219 219 ``` | [Impacted Files](https://codecov.io/gh/dlang-community/D-YAML/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community) | Coverage Δ | | |---|---|---| | [source/dyaml/test/tokens.d](https://codecov.io/gh/dlang-community/D-YAML/pull/313/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community#diff-c291cmNlL2R5YW1sL3Rlc3QvdG9rZW5zLmQ=) | `100.00% <100.00%> (ø)` | | ------ [Continue to review full report at Codecov](https://codecov.io/gh/dlang-community/D-YAML/pull/313?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://codecov.io/gh/dlang-community/D-YAML/pull/313?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community). Last update [9456888...c682037](https://codecov.io/gh/dlang-community/D-YAML/pull/313?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dlang-community).