doc: document directories in test directory
Pull Request check-list
Please make sure to review and check all of these items:
-
Does make -j8 test
(UNIX) orvcbuild test nosign
(Windows) pass with this change (including linting)? -
Is the commit message formatted according to CONTRIBUTING.md? -
If this change fixes a bug (or a performance problem), is a regression test (or a benchmark) included? -
Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.
Affected core subsystem(s)
- tests
Description of change
Add documentation for test directory as per https://github.com/nodejs/node/issues/5538