test: removed PHP unit tests since these aren't used

Author: [email protected]

composer.json

@@ -4,19 +4,6 @@
 	"license": "GPL-3.0-or-later",
 	"type": "wordpress-plugin",
 	"require-dev": {
-		"phpunit/phpunit": "^6",
-		"wp-phpunit/wp-phpunit": "5.7",
-		"roots/wordpress": "5.7",
 		"wp-cli/i18n-command": "^2.2"
-	},
-	"scripts": {
-		"test": [
-			"phpunit tests"
-		]
-	},
-	"config": {
-        "allow-plugins": {
-            "roots/wordpress-core-installer": true
-        }
-    }
+	}
 }