7.4. Mock objects

Inject new methods

Inject a new method into Some::Class:

use Test::V0 qw/mock/;

my $mock = mock 'Some::Class' => (
    add => [
        is_active => sub { ... }
    ]
);

Some::Class->is_active(); # Calls our newly injected method.

Inject a new method into an anonymous class:

use Test::V0 qw/mock/;

my $simple_mock = mock {} => (
    add => [
        is_active => sub { ... }
    ]
);

$simple_mock->is_active(); # Calls our newly injected method.

Override existing methods

Override an existing method in Some::Class:

my $mock = mock 'Some::Class' => (
    override => [
        replace_method => sub { ... },
    ],
);

Some::Class->replace_method();    # Calls our replacement method.

$mock->override(...) # Override some more

Restore original methods

$mock = undef; # Undoes all the mocking, restoring all original methods.

For more info

For more details see Test2::Tools::Mock.