Add command for running project-specitic PHPUnit tests

[janette]

User Story:

When I write custom code for DKAN site, I want to be able to test it, to ensure against regression.

Acceptance Criteria:

I can run dktl site:test:phpunit dktl site:test:cypress and the tests located in src directory will be run

Create commands above that will run corresponding tests

Estimate:

1 day

Notes:

phpunit.xml

<phpunit
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.6/phpunit.xsd"
    bootstrap="/var/www/vendor/weitzman/drupal-test-traits/src/bootstrap.php"
    colors="true"
    stopOnFailure="false"
    stopOnError="false"
    verbose="true">

    <testsuites>
        <testsuite name="Custom Test Suite">
            <directory>my_module/tests/src/ExistingSite/TestName.php</directory>
        </testsuite>
    </testsuites>

    <php>
        <!-- These variables may alternatively be set as environment variables. -->
        <!-- E.g., `DRUPAL_VERSION=V8 ./vendor/bin/phpunit` -->
        <env name="DRUPAL_VERSION" value="V8"/>
        <env name="DTT_BASE_URL" value="http://web"/>
        <env name="SIMPLETEST_BASE_URL" value="http://web"/>
        <env name="SIMPLETEST_DB" value="mysql://drupal:123@db/drupal"/>
    </php>
</phpunit>

• Add phpunit.xml to src/modules
• Run dktl custom:test-phpunit --testsuite "Custom Test Suite"

[dafeder]

Also, there should really be tests for these... let's discuss we can make a separate ticket for those if not feasible for this PR.