Add EncodingServiceTest

Signed-off-by: Raul <raul@nextcloud.com>

Author: Raudius

composer.json

@@ -6,7 +6,8 @@
         "christophwurst/nextcloud": "dev-master",
         "jakub-onderka/php-parallel-lint": "^1.0.0",
         "nextcloud/coding-standard": "^1.0.0",
-        "psalm/phar": "^4.3"
+        "psalm/phar": "^4.3",
+        "phpunit/phpunit": "^9.5"
     },
     "license": "AGPLv3",
     "authors": [
@@ -22,6 +23,7 @@
       "lint": "find . -name \\*.php -not -path './vendor/*' -print0 | xargs -0 -n1 php -l",
       "cs:check": "php-cs-fixer fix --dry-run --diff",
       "cs:fix": "php-cs-fixer fix",
-      "psalm": "psalm.phar"
+      "psalm": "psalm.phar",
+      "test:unit": "phpunit -c tests/phpunit.xml"
     }
 }