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sub add_log {
    my ($self, $parser, $coderef) = @_;
...

    return 1;
}

sub find_message {
    my ($self, $argref) = @_;
...
       return 0;
    }
}

   my $tracer = Mail::Log::Trace::Postfix->new({log_file => 't/data/lo
+g'});
   my $object = Mail::Log::Trace::Multiple->new();
...
   ok($object->find_message($condition) , 'Mail::Log::Trace::Multiple:
+ Find message from "to" field.');

   ok($tracer->find_message_info($condition), 'tracer test.');