I'm a contributor of red-data-tools/red-datasets. The tests for red-datasets use test-unit. Thanks!

With the increasing size of test suite, the execution time for tests are slow down. I'll give it a try to improve the execution time below:

• First, improve the slowest test.
• Next, improve the next slowest test.
• Repeat it until exists slow tests.

Nevertheless the execution time for tests are slow, I want to parallelization support of test-unit.

I would like to discuss the design of parallelization support of test-unit in this issue.