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In the documentation for Test::More, the note() function is described as
"Handy for putting in notes which might be useful for debugging, but
don't indicate a problem." diag() is mainly intended to be used in
situations where a unit test has failed and more diagnostic output would
be helpful in debugging.
Here, we're simply making a note of the name of the tempfile created
during testing, so note() is more appropriate.
In addition, note() prints to STDOUT when the tests are run as part of a
harness; diag() prints to STDERR. When Encode's test suite is run as
part of the Perl 5 core distribution's test suite, this diag() statement
is the only statement that gets printed to STDERR. Once this p.r. is
applied, a new version of Encode is released to CPAN, and that version
is synched into blead, then Perl's test suite will run entirely to
STDOUT.