Update comment according to @geirst's comments. Add test as suggested by @vekterli.
Update comment according to @geirst's comments.
Add test as suggested by @vekterli.

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa