Optional Path

Considering you have a complex structure with optional path into it. You can use the method ifPathIsReadable to make some test optional:

Example: If Path Is Readable

(new Tester(null))
    ->ifPathIsReadable(
        'notExistingPath',
        function (Tester $tester) {
            //Will not be call with current data to test
        }
    );

This obviously make more sense with a combination of each. In this more complex example lets say you receive a list of users object that don’t have the same properties available:

Example If Path Is Readable And Each

$users = [
    (object)[
        'firstName' => 'Martin',
        'active' => true,
        'referral' => 'Google'
    ],
    (object)[
        'firstName' => 'Julie',
        'active' => false
    ]
];
(new Tester($users))
    ->each(
        function (Tester $tester) {
            $tester->path('firstName')->assertInternalType('string');
            $tester->path('active')->assertInternalType('boolean');
            $tester->ifPathIsReadable(
                'referral',
                function (Tester $tester) {
                    $tester->assertInternalType('string');
                }
            );
        }
    );