Update code style, add unit tests for discovery

Author: FWest98

composer.json

@@ -24,7 +24,8 @@
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpunit/phpunit": "^9.5",
         "roave/security-advisories": "dev-master",
-        "squizlabs/php_codesniffer": "^3.6"
+        "squizlabs/php_codesniffer": "^3.6",
+        "ext-json": "*"
     },
     "autoload": {
         "psr-4": {