run the tests in all workspaces

[irevoire]

With #676 I noticed the tests were not running in any of our sub crates. Most of our sub crates didn't includes any tests though. But the filter-parser did and we're lucky we never broke these one without noticing 😁

[bors[bot]]

Build succeeded:

• Run Rustfmt
• Tests on macos-latest
• Tests on ubuntu-20.04
• Tests on windows-latest