Failing PHPUnit tests

[dragos5436]

Hi,

There are a few PHPUnit tests for this plugin that are failing:

filter_ally_jwthelper_testcase::test_jwttoken_valid
UnexpectedValueException: $keyOrKeyArray must be an instance of Firebase\JWT\Key key or an array of Firebase\JWT\Key keys

/var/www/html/lib/php-jwt/src/JWT.php:416
/var/www/html/lib/php-jwt/src/JWT.php:114
/var/www/html/filter/ally/tests/jwthelper_test.php:50
/var/www/html/filter/ally/tests/jwthelper_test.php:94
/var/www/html/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/html/vendor/phpunit/phpunit/phpunit:97

filter_ally_jwthelper_testcase::test_jwttoken_valid_teacher
UnexpectedValueException: $keyOrKeyArray must be an instance of Firebase\JWT\Key key or an array of Firebase\JWT\Key keys

/var/www/html/lib/php-jwt/src/JWT.php:416
/var/www/html/lib/php-jwt/src/JWT.php:114
/var/www/html/filter/ally/tests/jwthelper_test.php:50
/var/www/html/filter/ally/tests/jwthelper_test.php:114
/var/www/html/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/html/vendor/phpunit/phpunit/phpunit:97

filter_ally_jwthelper_testcase::test_jwttoken_valid_student
UnexpectedValueException: $keyOrKeyArray must be an instance of Firebase\JWT\Key key or an array of Firebase\JWT\Key keys

/var/www/html/lib/php-jwt/src/JWT.php:416
/var/www/html/lib/php-jwt/src/JWT.php:114
/var/www/html/filter/ally/tests/jwthelper_test.php:50
/var/www/html/filter/ally/tests/jwthelper_test.php:136
/var/www/html/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/html/vendor/phpunit/phpunit/phpunit:97

filter_ally_jwthelper_testcase::test_jwttoken_valid_guest
UnexpectedValueException: $keyOrKeyArray must be an instance of Firebase\JWT\Key key or an array of Firebase\JWT\Key keys

/var/www/html/lib/php-jwt/src/JWT.php:416
/var/www/html/lib/php-jwt/src/JWT.php:114
/var/www/html/filter/ally/tests/jwthelper_test.php:50
/var/www/html/filter/ally/tests/jwthelper_test.php:159
/var/www/html/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/html/vendor/phpunit/phpunit/phpunit:97

MySQL 5.7
PHP 7.4
Moodle latest MOODLE_400_STABLE
executed with moodlehq/moodle-docker