Directories of test cases:
--------------------------

good: these adhere to the posix standard, and should be accepted.
bad: these do not adhere to the standard, and should be rejected.
unspecified: cases where the standard says that the behavior is
  unspecified
unknown: cases where we could not figure out whether there are
  good, bad, or unspecified.


How to add tests:
-----------------
Tests are structured by the section of the policy concerned, whenever
possible.

Please add a comment at the beginning of the test file, explaining what
is being tested.