Ref: https://docs.moodle.org/dev/PHPUnit

composer install --dev

php admin/tool/phpunit/cli/init.php

vendor/bin/phpunit format_ned_testcase course/format/ned/tests/format_ned_test.php
or
vendor\bin\phpunit format_ned_testcase course/format/ned/tests/format_ned_test.php

vendor/bin/phpunit format_ned_upgrade_testcase course/format/ned/tests/format_ned_upgrade_test.php
or
vendor\bin\phpunit format_ned_upgrade_testcase course/format/ned/tests/format_ned_upgrade_test.php

vendor/bin/phpunit --group format_ned
or
vendor\bin\phpunit --group format_ned
