their output.
You can glean some further possible issues from the TAP grammar
- (see http://search.cpan.org/perldoc?TAP::Parser::Grammar#TAP_Grammar)
+ (see https://metacpan.org/pod/TAP::Parser::Grammar#TAP-GRAMMAR)
but the best indication is to just run the tests with prove(1),
it'll complain if anything is amiss.