[PATCH 3/4] t/*.t: localize $SIG{__WARN__} changes

[Eric Wong <e@yhbt.net>]

We don't want to propagate %SIG changes to other tests when
running multiple tests within the same process via t/run.perl.
---
 t/mda_filter_rubylang.t   | 2 +-
 t/nntpd.t                 | 2 +-
 t/watch_filter_rubylang.t | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/mda_filter_rubylang.t b/t/mda_filter_rubylang.t
index dbcb275b..6f288b7e 100644
--- a/t/mda_filter_rubylang.t
+++ b/t/mda_filter_rubylang.t
@@ -18,7 +18,7 @@ is(system(@cfg, 'publicinboxmda.spamcheck', 'none'), 0);
 
 for my $v (qw(V1 V2)) {
 	my @warn;
-	$SIG{__WARN__} = sub { push @warn, @_ };
+	local $SIG{__WARN__} = sub { push @warn, @_ };
 	my $cfgpfx = "publicinbox.$v";
 	my $inboxdir = "$tmpdir/$v";
 	my $addr = "test-$v\@example.com";
diff --git a/t/nntpd.t b/t/nntpd.t
index 43b14d66..826e3f3d 100644
--- a/t/nntpd.t
+++ b/t/nntpd.t
@@ -268,7 +268,7 @@ Date: Fri, 02 Oct 1993 00:00:00 +0000
 			$for_leafnode->header_set('Message-ID', @mids);
 			$for_leafnode->body_set('not-a-dupe');
 			my $warn = '';
-			$SIG{__WARN__} = sub { $warn .= join('', @_) };
+			local $SIG{__WARN__} = sub { $warn .= join('', @_) };
 			$im->add($for_leafnode);
 			$im->done;
 			like($warn, qr/reused/, 'warned for reused MID');
diff --git a/t/watch_filter_rubylang.t b/t/watch_filter_rubylang.t
index b4540660..09217d94 100644
--- a/t/watch_filter_rubylang.t
+++ b/t/watch_filter_rubylang.t
@@ -24,7 +24,7 @@ SKIP: {
 
 for my $v (@v) {
 	my @warn;
-	$SIG{__WARN__} = sub { push @warn, @_ };
+	local $SIG{__WARN__} = sub { push @warn, @_ };
 	my $cfgpfx = "publicinbox.$v";
 	my $inboxdir = "$tmpdir/$v";
 	my $maildir = "$tmpdir/md-$v";