The Opaque question type and behaviour https://moodle.org/plugins/qtype_opaque

Opaque (http://docs.moodle.org/en/Development:Opaque) is the Open protocol for accessing question engines.

The Opaque protocol was originally created by sam marshall of the Open University (http://www.open.ac.uk/) as part of the OpenMark project (http://java.net/projects/openmark/). The Moodle implementation of Opaque was done by Tim Hunt.

As well as OpenMark, this question type can also be used to connect to ounit (http://code.google.com/p/ounit/) and possibly other question systems we don't know about.

Opaque has been available since Moodle 1.8, but this version is compatible with Moodle 3.4.

This question behaviour also requires the Opaque question type to be installed. https://moodle.org/plugins/qbehaviour_opaque

You can install from the Moodle plugins database using the links above. Or to install using git, type this command in the root of your Moodle install

git clone https://github.com/moodleou/moodle-qtype_opaque.git question/type/opaque
echo '/question/type/opaque/' >> .git/info/exclude
git clone https://github.com/moodleou/moodle-qbehaviour_opaque.git question/behaviour/opaque
echo '/question/behaviour/opaque/' >> .git/info/exclude

Once installed you need to go to the question type settings page (Site administration -> Plugins -> Question types -> Opaque) to set up the URLs of the question engines you wish to use.

https://github.com/moodleou/moodle-local_testopaqueqe can be used to test that Opaque is working.

To be able to run all the unit tests, you need a working OpenMark install, then you need to add define('QTYPE_OPAQUE_TEST_ENGINE_QE', 'http://example.com/om-qe/services/Om'); define('QTYPE_OPAQUE_TEST_ENGINE_TN', 'http://example.com/openmark/!question'); define('QTYPE_OPAQUE_TEST_ENGINE_PASSKEY', 'abc123'); define('QTYPE_OPAQUE_TEST_ENGINE_TIMEOUT', '5'); to your config.php file. Of these, only the first is required. The remaining ones are optional. Specify them if your set-up needs them.