Move tests out of pure directory

[robertbrignull]

When moving code out of the /pure directory and into /common and other directories, I forgot about the tests. This PR moves all of the tests out of /pure and into other directories to match the files they are testing.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Good spot! 🪝

Out of interest, did the "Unwanted dependency on vscode API" CodeQL query catch these test files? Should it?

[robertbrignull]

Out of interest, did the "Unwanted dependency on vscode API" CodeQL query catch these test files? Should it?

That wasn't how I noticed about the test files and I don't think we'd expect it to alert on any of the tests files. In the query we only look for files in the "src" directory.

We could expand the query to include the tests, but it's a little less important, and the tests themselves will fail if you include a vscode dependency in the unit tests. I think it's fine as it is and we don't need to adjust the query.