Unit test class collision with qtype_stack

[Fragonite]

This plugin defines a Response class in the global namespace, causing a class collision and failing unit tests when qtype_stack creates a mock class with the same name.

Using namespaces would have prevented this issue. Are there any plans for introducing them?

https://github.com/turnitin/moodle-mod_turnitintooltwo/blob/develop/sdk/response.class.php#L11

https://github.com/maths/moodle-qtype_stack/blob/master/tests/api_controller_test.php#L103-L106

Example test output below. Tested with Moodle 4.1 and 4.5.

1) qtype_stack\api_controller_test::test_render
PHPUnit\Framework\MockObject\ClassAlreadyExistsException: Class "Response" already exists

/var/www/muat/question/type/stack/tests/api_controller_test.php:124
/var/www/muat/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/muat/vendor/phpunit/phpunit/phpunit:97

2) qtype_stack\api_controller_test::test_render_specified_seed
PHPUnit\Framework\MockObject\ClassAlreadyExistsException: Class "Response" already exists

/var/www/muat/question/type/stack/tests/api_controller_test.php:124
/var/www/muat/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/muat/vendor/phpunit/phpunit/phpunit:97

3) qtype_stack\api_controller_test::test_render_plots
PHPUnit\Framework\MockObject\ClassAlreadyExistsException: Class "Response" already exists

/var/www/muat/question/type/stack/tests/api_controller_test.php:124
/var/www/muat/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/muat/vendor/phpunit/phpunit/phpunit:97

4) qtype_stack\api_controller_test::test_render_iframes
PHPUnit\Framework\MockObject\ClassAlreadyExistsException: Class "Response" already exists

/var/www/muat/question/type/stack/tests/api_controller_test.php:124
/var/www/muat/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/muat/vendor/phpunit/phpunit/phpunit:97

Cheers.