Enable autoflush on STDOUT and STDERR for tests

This prevents STDOUT lines from appearing out of order relative to
STDERR lines in the test log, which makes it much easier to understand
what's happening.

Devel::Autoflush is from https://metacpan.org/pod/Devel::Autoflush and
is licensed under the terms of the Apache 2.0 license.

Makefile.am

@@ -67,7 +67,8 @@ PL_LOG_DRIVER = $(LOG_DRIVER)
 PL_LOG_COMPILER = $(PERL)
 AM_PL_LOG_FLAGS = -Mstrict -w \
 	-I'$(abs_top_builddir)' \
-	-I'$(abs_top_srcdir)'/t/lib
+	-I'$(abs_top_srcdir)'/t/lib \
+	-MDevel::Autoflush
 handwritten_tests = \
 	t/geturl_connectivity.pl \
 	t/geturl_ssl.pl \
@@ -77,6 +78,7 @@ generated_tests = \
 	t/version.pl
 TESTS = $(handwritten_tests) $(generated_tests)
 EXTRA_DIST += $(handwritten_tests) \
+	t/lib/Devel/Autoflush.pm \
 	t/lib/Test/Builder.pm \
 	t/lib/Test/Builder/Formatter.pm \
 	t/lib/Test/Builder/IO/Scalar.pm \

t/lib/Devel/Autoflush.pm

@@ -0,0 +1,106 @@
+package Devel::Autoflush;
+# ABSTRACT: Set autoflush from the command line
+our $VERSION = '0.06'; # VERSION
+
+my $kwalitee_nocritic = << 'END';
+# can't use strict as older stricts load Carp and we can't allow side effects
+use strict;  
+END
+
+my $old = select STDOUT;
+$|++;
+select STDERR;
+$|++;
+select $old;
+
+1;
+
+__END__
+
+=pod
+
+=encoding UTF-8
+
+=head1 NAME
+
+Devel::Autoflush - Set autoflush from the command line
+
+=head1 VERSION
+
+version 0.06
+
+=head1 SYNOPSIS
+
+ perl -MDevel::Autoflush Makefile.PL
+
+=head1 DESCRIPTION
+
+This module is a hack to set autoflush for STDOUT and STDERR from the command
+line or from C<PERL5OPT> for code that needs it but doesn't have it.
+
+This often happens when prompting:
+
+  # guess.pl
+  print "Guess a number: ";
+  my $n = <STDIN>;
+
+As long as the output is going to a terminal, the prompt is flushed when STDIN
+is read.  However, if the output is being piped, the print statement will 
+not automatically be flushed, no prompt will be seen and the program will
+silently appear to hang while waiting for input.  This might happen with 'tee':
+
+  $ perl guess.pl | tee capture.out
+
+Use Devel::Autoflush to work around this:
+
+  $ perl -MDevel::Autoflush guess.pl | tee capture.out
+
+Or set it in C<PERL5OPT>:
+
+  $ export PERL5OPT=-MDevel::Autoflush
+  $ perl guess.pl | tee capture.out
+
+= SEE ALSO
+
+=over 4
+
+=item *
+
+L<CPANPLUS::Internals::Utils::Autoflush> -- same idea but STDOUT only and 
+
+only available as part of the full CPANPLUS distribution
+
+=back
+
+=for :stopwords cpan testmatrix url annocpan anno bugtracker rt cpants kwalitee diff irc mailto metadata placeholders metacpan
+
+=head1 SUPPORT
+
+=head2 Bugs / Feature Requests
+
+Please report any bugs or feature requests through the issue tracker
+at L<https://github.com/dagolden/Devel-Autoflush/issues>.
+You will be notified automatically of any progress on your issue.
+
+=head2 Source Code
+
+This is open source software.  The code repository is available for
+public review and contribution under the terms of the license.
+
+L<https://github.com/dagolden/Devel-Autoflush>
+
+  git clone https://github.com/dagolden/Devel-Autoflush.git
+
+=head1 AUTHOR
+
+David Golden <dagolden@cpan.org>
+
+=head1 COPYRIGHT AND LICENSE
+
+This software is Copyright (c) 2014 by David Golden.
+
+This is free software, licensed under:
+
+  The Apache License, Version 2.0, January 2004
+
+=cut