We can then setup lot's of tests and run them through one invocation of bc.
Example 7-5. examples/bc/bc5.pl
#!/usr/bin/perl
use strict;
use warnings;
use Expect;
use Test::More qw(no_plan);
$Expect::Log_Stdout = 0;
my @sets = (
[23+7, 30],
['23+7', 30],
['11+1', 10],
['2*21', 42],
);
my $e = Expect->new;
$e->spawn("bc") or die "Could not start bc\n";
$e->expect(undef, "warranty") or die "no warranty\n";
foreach my $set (@sets) {
$e->send("$$set[0]\n");
ok($e->expect(1, $$set[1]), $$set[0]);
}
$e->send("quit\n");