[PATCH 4/4] tests: no IPv6 on old Net::NNTP, Mail::IMAPClient, HTTP::Tiny

[Eric Wong]

The versions of these modules which ship with CentOS 7.x did not
support IPv6 properly.
---
 lib/PublicInbox/TestCommon.pm | 9 +++++++++
 t/extsearch.t                 | 4 ++--
 t/nntpd.t                     | 3 +--
 t/v2writable.t                | 2 +-
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 55d82fc0..333791b4 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -117,6 +117,12 @@ sub require_git ($;$) {
        1;
 }
 
+my %IPv6_VERSION = (
+       'Net::NNTP' => 3.00,
+       'Mail::IMAPClient' => 3.40,
+       'HTTP::Tiny' => 0.042,
+);
+
 sub require_mods {
        my @mods = @_;
        my $maybe = pop @mods if $mods[-1] =~ /\A[0-9]+\z/;
@@ -167,6 +173,9 @@ sub require_mods {
                                !eval{ IO::Socket::SSL->VERSION(2.007); 1 }) {
                        push @need, $@;
                }
+               if (defined(my $v = $IPv6_VERSION{$mod})) {
+                       $ENV{TEST_IPV4_ONLY} = 1 if !eval { $mod->VERSION($v) };
+               }
        }
        return unless @need;
        my $m = join(', ', @need)." missing for $0";
diff --git a/t/extsearch.t b/t/extsearch.t
index 2d7375d6..6cbe5262 100644
--- a/t/extsearch.t
+++ b/t/extsearch.t
@@ -13,8 +13,6 @@ require PublicInbox::Search;
 use_ok 'PublicInbox::ExtSearch';
 use_ok 'PublicInbox::ExtSearchIdx';
 use_ok 'PublicInbox::OverIdx';
-my $sock = tcp_server();
-my $host_port = tcp_host_port($sock);
 my ($home, $for_destroy) = tmpdir();
 local $ENV{HOME} = $home;
 mkdir "$home/.public-inbox" or BAIL_OUT $!;
@@ -125,6 +123,8 @@ EOF
 
 SKIP: {
        require_mods(qw(Net::NNTP), 1);
+       my $sock = tcp_server();
+       my $host_port = tcp_host_port($sock);
        my ($out, $err) = ("$home/nntpd.out.log", "$home/nntpd.err.log");
        my $cmd = [ '-nntpd', '-W0', "--stdout=$out", "--stderr=$err" ];
        my $td = start_script($cmd, undef, { 3 => $sock });
diff --git a/t/nntpd.t b/t/nntpd.t
index 34e9e1b4..d352c3c1 100644
--- a/t/nntpd.t
+++ b/t/nntpd.t
@@ -2,10 +2,9 @@
 # Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 use strict; use v5.10.1; use PublicInbox::TestCommon;
-require_mods(qw(DBD::SQLite));
+require_mods(qw(DBD::SQLite Net::NNTP));
 use PublicInbox::Eml;
 use Socket qw(IPPROTO_TCP TCP_NODELAY);
-use Net::NNTP;
 use Sys::Hostname;
 use POSIX qw(_exit);
 use Digest::SHA;
diff --git a/t/v2writable.t b/t/v2writable.t
index 477621e2..ad946338 100644
--- a/t/v2writable.t
+++ b/t/v2writable.t
@@ -149,7 +149,7 @@ SELECT COUNT(*) FROM over WHERE num > 0
 }
 
 {
-       use Net::NNTP;
+       require_mods('Net::NNTP', 1);
        my $err = "$inboxdir/stderr.log";
        my $out = "$inboxdir/stdout.log";
        my $group = 'inbox.comp.test.v2writable';