1. Install PHPUnit and Selenium (for FunctionalJavascript tests);

you can install PHPUnit with Composer:
```
composer require phpunit/phpunit
```
NOTE: For Selenium you need to install first npm. Then you can install Selenium with these commands:
```
npm install selenium-standalone@latest -g
selenium-standalone install
```
- When Selenium is installed run command:
```
selenium-standalone start
```
You need to apply this patch contrib-modules-issues-test-running.patch.zip (Our modules depend on many contrib modules and some of these modules have issues (which can be fixed in future)

2. Check PHPUnit configuration for testing:

Find core/phpunit.xml (if not exist just copy phpunit.xml.dist and rename to phpunit.xml)

In this file you need to specify these settings:

<!-- Example SIMPLETEST_BASE_URL value: http://localhost -->
<env name="SIMPLETEST_BASE_URL" value=""/>
<!-- Example SIMPLETEST_DB value: mysql://username:password@localhost/databasename#table_prefix -->
<env name="SIMPLETEST_DB" value=""/>
<!-- Example BROWSERTEST_OUTPUT_DIRECTORY value: /path/to/webroot/sites/simpletest/browser_output -->
<env name="BROWSERTEST_OUTPUT_DIRECTORY" value=""/>

For Selenium running you need to add this line in phpunit.xml:

<env name="MINK_DRIVER_ARGS_WEBDRIVER" value='["chrome", null, "http://localhost:4444/wd/hub"]'/>

3. Enable Simpletest module with drush command:

drush en simpletest

4. Run tests:

Run this test (for example):

sudo -u www-data -E vendor/bin/phpunit -c core --group opigno_learning_path

# Or the same with debug info:
sudo -u www-data -E vendor/bin/phpunit -c core --group opigno_learning_path --printer="\Drupal\Tests\Listeners\HtmlOutputPrinter

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