Mark some test coverage as done.
Rename type tokens for clarity.

I always get this around the wrong way the first time.
Utility for group a collection by some value.
Detect duplicate plugin requests.
Sync test coverage status
Validate plugin ids at compile time
Ensure plugin id and version aren't the empty string.
Test that null values aren't allowed for plugin ids or versions.
Support qualified core plugins.
Some trace for CI failure.