msgmap: mid_insert ignores duplicates instead of die-ing

This will allow smoother imports as occasional Message-ID
duplicates happen and the best we can do is ignore the
second one.

1 files changed, 3 insertions, 3 deletions

diff --git a/t/msgmap.t b/t/msgmap.t
index 5c28e54d..a5232fab 100644
--- a/t/msgmap.t
+++ b/t/msgmap.t
@@ -27,9 +27,9 @@ foreach my $mid (@mids) {
 }
 
 $@ = undef;
-eval { $d->mid_insert('a@b') };
-ok($@, 'error raised when attempting duplicate message ID');
-
+my $ret = $d->mid_insert('a@b');
+is($ret, undef, 'duplicate mid_insert in undef result');
+is($d->num_for('a@b'), $mid2num{'a@b'}, 'existing number not clobbered');
 
 foreach my $n (keys %num2mid) {
         is($d->mid_for($n), $num2mid{$n}, "num:$n maps correctly");