Replace TESTING.md contents with link to new docs page

TESTING.md

@@ -1,71 +1,3 @@
 # Testing
 
-**ATTENTION:** The following notes are meant **for developers only**. If you only want
-to use this plugin you can fully ignore this file.
-
-
-## Creating a PHPUnit test environment
-
-See: https://moodledev.io/general/development/tools/phpunit
-
-1. Spawn a shell inside your Moodle/php-fpm container and navigate to your
-   Moodle root directory:
-   ```bash
-   docker exec -it my-moodle-container sh
-   cd /usr/share/nginx/www/moodle/
-   ```
-2. Prepare PHPUnit configuration. Add the following lines to your `config.php`:
-   ```php
-   $CFG->phpunit_prefix = 'phpu_';
-   $CFG->phpunit_dataroot = '/path/to/your/phpunit_moodledata';
-   ```
-3. Download composer and install dev dependencies:
-   ```bash
-   wget https://getcomposer.org/download/latest-stable/composer.phar
-   php composer.phar install
-   ```
-4. Bootstrap test environment:
-   ```bash
-   php admin/tool/phpunit/cli/init.php --disable-composer
-   ```
-
-
-## Running tests
-
-- Run all tests:
-  ```bash
-  vendor/bin/phpunit --colors --testdox
-  ```
-- Run all tests for a single component:
-    ```bash
-    vendor/bin/phpunit --colors --testdox --filter quiz_archiver/*
-    ```
-- Run a single test suite:
-    ```bash
-    vendor/bin/phpunit --colors --testdox mod/quiz/report/archiver/tests/Report_test.php
-    ```
-
-### Automatic test execution for all supported software configurations
-
-The configuration for automated test execution via GitHub CI can be found in
-`.github/workflows/moodle-plugin-ci.yml`. It holds a matrix of all supported
-software configurations and runs the tests for each of them.
-
-
-## Generating code coverage reports
-
-**You need to have xdebug installed and enabled in order to generate coverage
-reports!**
-
-1. Run PHPUnit with coverage report:
-   ```bash
-   XDEBUG_MODE=coverage vendor/bin/phpunit --colors --testdox --coverage-html /tmp/coverage --filter quiz_archiver/*
-   ```
-2. Copy the generated report to your machin:
-    ```bash
-    docker cp my-moodle-container:/tmp/coverage /tmp/coverage
-    ```
-3. Open the report in your browser:
-   ```bash
-   xdg-open /tmp/coverage/index.html
-   ```
+See: https://quizarchiver.gandrass.de/development/unittests/