Fix and Update Unit Tests

[jwaspin]

Some of the unit tests are failing because of changes to the schema resulting in changes to the readers/writers.

During updates the use of MiniTest was changed to Minitest, which is the newer version of this - a number of files need to be updated with the new spelling (T -> t).

• [x] #296

Failing Tests

• [ ] #291
• [x] #295
• [ ] #292
• [ ] #293

Errors

• [ ] #294