Systematic cleanup of tests.

[brettviren]

WCT has many unit tests in the form test*.cxx. Each one provides a main() and linking them during the build is time consuming. All have one or more of these problems:

• Each is a main() and thus require long time to link them all.
• There is no cohesion across the tests (no "suites of cases").
• Varied use of uncaptured cout/cerr usage (should use logging).
• Big one: no actual run-time testing (no assertions).
  • Though even these serve as compile-time tests.
• Rely on humans to look at some plot.
• Require input files and/or command line args to do anything at all.
  • Really should be "checks".

OTOH, WCT also has doctest tests which avoids all/most of these problems.

The basic plan for addressing this is to migrate tests to doctests and correct what problems we can along the way and/or divert tests to checks.

1. Have LLM separate test*.cxx into things that really need to be check*.cxx and which are candidates for migrating to doctests.
2. Have LLM make a beads issue for each test in the to-migrate list.
3. Develop a claude "command" with instructions on how to migrate a test*.cxx file, including updating a beads issue with summary of what was done, closing it, and opening a new issue if the LLM determines human followup is needed.
4. Develop a script to iterate on beads with a fresh claude -p for each test.
5. Run through the tests to migrate.
6. Human examines any new issues and addresses them in some creative way.

[brettviren]

And then more:

7. Move any tests categorized as "migrate to checks" into the "migrate to doctests" list, make new tasks for the migration epic and rerun the iteration.

The initial categorization split the 85 tests in util into 40 to become doctests and 45 to become checks. A quick survey shows the "convert to checks" fall into sub-categories:

• demo code just to see how something works
• dump to cout which may be best turned into a "test with blessed target output".
• assert-free tests of file I/O that will need some kind of input fodder and/or tempfile support.

[brettviren]

That commit accomplished a big chunk but about half the original test*.cxx remain and a similar number are scattered across the other sub-packages.