but that one would better be named `test_tag_regexes` or something. and we could also test the other regex options such as `some-key-regex:` and `:val-only-regex`
(see https://github.com/vimeo/graph-explorer/wiki/GEQL#query-execution for a description of all options).

I don't want to make you write all my unit tests but you seem to be really good at it :) and i'm still working my way through the code.