Convert the compiled tests to unit tests

**Describe the feature you'd like**
There are several tests that are compiled to an executable but don't use the unit testing framework. Often rendering is used, but it's not strictly necessary. We should convert these tests to unit tests and get rid of the renders that are not required. These are:

- test_0038
- test_0138
- test_0142
- test_0148
- test_0161
- test_0162
- test_0168
- test_0174
- test_0178
- test_0180

Locate test_0038, test_0138, test_0142, test_0148, test_0161, test_0162, test_0168, test_0174, test_0178, and test_0180, then inspect how they are currently compiled and tested. Convert each to the unit testing framework and remove renders that are not required. Done means all ten tests run as unit tests while retaining necessary rendering coverage.

Written by the indexing model from the issue text.