use Test::More 'no_plan';

use Test::MockObject;
my $mock = Test::MockObject->new();

use_ok( 'A::Class' );
my $a = A::Class->new();
isa_ok( $a, 'A::Class' );

$mock->set_true( 'some_other_method' )
     ->set_true( 'some_method_or_other' );

$a->some_method( $mock );