Increase PBJ Test Coverage

The PBJ test coverage is lower than we would like it to be. As part of the testing quest, this should be increased. Sub issues will need to be sourced from the PBJ repo

The issue names PBJ and says that subissues must be sourced from the PBJ repository, but it gives no files or tests. Start by locating the PBJ repository and its existing coverage information, then identify concrete coverage gaps for separate subissues. Done means the selected gaps have added tests and coverage is measurably increased.

Written by the indexing model from the issue text.