A good start would be to tackle e.g. ortho.jl coverage, by adding tests with a SimpleCharTable resp. its characters.
That actually also is the "solution" for a bunch of other files/code, i.e., no test for the functionality in "simple" tables.
Another big sources of uncovered code is input validations: would be good to also test those, by adding tests that explicitly invoke functions with invalid input (out of bounds) to make sure those errors are caught correctly.
A good start would be to tackle e.g.
ortho.jlcoverage, by adding tests with aSimpleCharTableresp. its characters.That actually also is the "solution" for a bunch of other files/code, i.e., no test for the functionality in "simple" tables.
Another big sources of uncovered code is input validations: would be good to also test those, by adding tests that explicitly invoke functions with invalid input (out of bounds) to make sure those errors are caught correctly.