[RE: JoSS Review] failing doctests

[betteridiot]

For the JoSS review at openjournals/joss-reviews/issues/6066

Please see https://github.com/betteridiot/joss_reviews/blob/master/cstag/joss_review.md for complete notes.

Doctests for cstag do not pass due to minor syntax errors. See Testing doctests. As doctests should also be testable (given their nature), this should be addressed.

[akikuno]

@betteridiot

I sincerely thank you for your comments regarding Doctests.

I have made modifications to ensure that the Doctests pass.
d37a56a

Additionally, I have added automatic testing for Doctests.
https://github.com/akikuno/cstag/actions/runs/6978602020/workflow#L39

I would be grateful if you could confirm them.

[betteridiot]

This satisfies my request. Thank you @akikuno.