Exceptions

Must throwMust not throw

static function(Assert $assert) {
    $assert->throws(
        static function() {
            // execute some code that must throw an exception
        },
        $optionalExceptionClass,
        'Optional error message',
    );
}

If the code throws an exception but it's not an instance of $optionalExceptionClass then the assertion fails.

static function(Assert $assert) {
    $assert
        ->not()
        ->throws(
            static function() {
                // execute some code that must not throw an exception
            },
            'Optional error message',
        );
}