* Boundary cases
Both SHA-224 and SHA-256 use 512-bit data chunks and have a special
behavior when chunk size is near the 448-bit boundary.
* Source type support
Basic smoke tests for accepting bytevectors and binary input ports
as valid arguments.
By convention, a library meant for testing exports "run-tests".
Also by convention, assume the test for (foo bar) is (foo bar-test),
keeping the test in the same directory and avoiding confusion since
(chibi test) is not a test for (chibi).
- Avoids the hack of "load"ing test, with resulting namespace complications.
- Allows keeping tests together with the libraries.
- Allows setting up test hooks before running.
- Allows implicit inference of test locations when using above conventions.