This trait serves as a shared interface for the different kinds of test
commands the 'cton-util test' understands.
Many tests produce output that is run through filecheck for validation.
Provide a simple run_filecheck() function to help with this.
Implement the 'test cat' sub-test which is probably the simplest
possible.
This code looks overly complicated because it is anticipating running
jobs in a thread pool.
The test files are loaded and parsed, but not actually executed yet.
Errors are reported back to the test runner.
This command accepts files and directories containing test cases to run.
Recursively searches for test files in any directory it is passed.
Actually running tests is not yet implemented.
