added `PHPUnit` as dev dependency

* added the `PHPUnit` requirement
* added script `test` to composer for running all tests

composer.json

@@ -14,6 +14,9 @@
         }
     ],
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9"
-    }
+    },
+	"scripts" : {
+		"test" : "./vendor/bin/phpunit tests --testdox --bootstrap tests/util.php"
+	}
 }

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e2289ec2def0b32ef8010e9336707400",
+    "content-hash": "279a20d650c6a9ed1a0b5762efc6325a",
     "packages": [],
     "packages-dev": [
         {
@@ -848,16 +848,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.5.16",
+            "version": "9.5.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "5ff8c545a50226c569310a35f4fa89d79f1ddfdc"
+                "reference": "1b5856028273bfd855e60a887278857d872ec67a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/5ff8c545a50226c569310a35f4fa89d79f1ddfdc",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/1b5856028273bfd855e60a887278857d872ec67a",
-                "reference": "5ff8c545a50226c569310a35f4fa89d79f1ddfdc",
+                "reference": "1b5856028273bfd855e60a887278857d872ec67a",
                 "shasum": ""
             },
             "require": {
@@ -935,7 +935,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.16"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.18"
             },
             "funding": [
                 {
@@ -947,7 +947,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2022-02-23T17:10:58+00:00"
+            "time": "2022-03-08T06:52:28+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -2111,5 +2111,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "2.1.0"
+    "plugin-api-version": "2.3.0"
 }