Add unit tests for TypeScriptifyModel class

Author: SalemC

composer.json

@@ -29,7 +29,8 @@
         "laravel/framework": "^9.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9.5",
+        "orchestra/testbench": "^7.10"
     },
     "extra": {
         "laravel": {